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((Use dmy dates|date=April 2018))
((Infobox automobile
| name         = Alfa Romeo 6C
| image        = Paris - RM auctions - 20150204 - Alfa Romeo 6C2500 Sport Berlinetta - 1939 - 009.jpg
| caption      = 1939 Alfa Romeo 6C 2500 Touring Superleggera Berlinetta
| manufacturer = [[Alfa Romeo]]
| aka          =
| production   = 1927–1954
| assembly     = Italy: [[Alfa Romeo Portello Plant|Portello Plant]], [[Milan]]
| class        = [[Luxury car]]<br />[[Sports car]]<br />[[Racing car]]
| body_style   =
| layout       = [[Front-engine, rear-wheel-drive]]
| platform     =
| engine       = [[Straight-six engine|Straight-six]]
| transmission =
| wheelbase    =
| length       =
| width        =
| height       =
| weight       =
| related      =
| designer     =
| predecessor  = [[Alfa Romeo RM]]
| successor    = [[Alfa Romeo 1900]]
| sp = uk
))

The '''Alfa Romeo 6C''' name was used on road, race, and sports cars produced between 1927 and 1954 by [[Alfa Romeo]]; the "6C" name refers to the six cylinders of the car's [[straight-six engine]]. Bodies for these cars were made by [[coachbuilder]]s such as [[James Young (coachbuilder)|James Young]], [[Zagato]], [[Carrozzeria Touring|Touring Superleggera]], [[Carrozzeria Castagna|Castagna]], and [[Pinin Farina]]. Beginning in 1933 there was also a 6C version with an Alfa factory body, built in [[Portello, Milan|Portello]]. In the early 1920s [[Vittorio Jano]] received a commission to create a lightweight, high performance vehicle to replace the [[Giuseppe Merosi]] designed [[Alfa Romeo RL|RL]] and [[Alfa Romeo RM|RM]] models. The car was introduced in April 1925 at the Salone dell' Automobile di Milano as the 6C 1500. It was based on Alfa's [[Alfa Romeo P2|P2]] Grand Prix car, using a single overhead cam 1,487 cc in-line six-cylinder engine, producing 44 horsepower. In 1928 the 1500 Sport was presented, which was the first Alfa Romeo road car with double overhead camshafts.

==((anchor|6C 1500))6C 1500 (1927–1929)==
((Infobox automobile
| name         = Alfa Romeo 6C 1500
| image        = Alfa Romeo Super Sport 1929.jpg
| caption      = 1929 6C 1500 Super Sport, 1929, in the Louwman Collection
| production   = 1927–1929
| engine       = 1.5&nbsp;L (1,487&nbsp;cc) [[Straight-six engine|I6]]<br />1.5&nbsp;L (1,487&nbsp;cc) [[supercharged]] I6
| transmission = 4-speed [[Manual transmission|manual]]
| wheelbase    = ((unbulleted list|((convert|2900|mm|in|1|abbr=on)) 4-seater((sfnp|Fusi|1978|p=115))|((convert|3100|mm|in|1|abbr=on)) 6-str., Normale((sfnp|Fusi|1978|p=115))|((convert|2920|mm|in|1|abbr=on)) Sport, S.S.((sfnp|Fusi|1978|p=127, 131))))
| length       = 
| width        = 
| height       = 
| weight       = 
| sp = uk
))

In the mid-1920s, Alfa's [[Alfa Romeo RL|RL]] was considered too large and heavy, so a new development began. The 2-litre formula that had led to Alfa Romeo winning the [[World Manufacturers' Championship|Automobile World Championship]] in 1925, changed to 1.5-litres for the 1926 season. The 6C 1500 was introduced in 1925 at the [[Milan]] Motor Show. Series production started in 1927,((sfn|Fusi|1978|page=113)) with the [[Alfa Romeo P2|P2]] Grand Prix car as a starting point.The Alfa Romeo 6C-1500 Super Sport features a twin overhead cam six cylinder engine with a bore of 62 mm and stroke of 82 mm, giving a displacement of 1487 cc, as against the P2's 1,987&nbsp;cc, while [[supercharger|supercharging]] was dropped. First versions were bodied by James Young and [[Carrozzeria Touring]].

In 1928, the 6C Sport model was released, with a dual [[overhead-camshaft]] engine. Its sport version won many races, including the 1928 [[Mille Miglia]]. Total production was 3,000 (200 with DOHC engines). Ten examples of a supercharged (''compressore'', compressor) Super Sport variant were also built.<ref name="alfa-romeo-6c" >[http://www.autoevolution.com/cars/alfa-romeo-6c-1500-1927.html www.autoevolution] Alfa Romeo introduced the 6C 1500 model in 1926, with series production beginning a year later. – Retrieved 2 January 2015</ref>

<gallery widths="180px" heights="120px" perrow="4">
File:Alfa Romeo 6C 1500 Normale.jpg|6C 1500 James Young Drophead Coupe, 1928
File:1928 Alfa Romeo 6C 1500 Sport Zagato Spyder - fvr.jpg|6C 1500 Sport Zagato Spyder, 1928
File:Boris Ivanowski and Attilio Marinoni at the 1928 24 Hours of Spa.jpg|Alfa Romeo 6C 1500 Sport, [[Boris Ivanowski]] and [[Attilio Marinoni]], winners of the 1928 [[24 Hours of Spa]].
</gallery>

===Specifications===
{|class="wikitable" style="text-align:center; font-size:91%;"
|-
! Model || Years ||style="line-height:1.2em;"| [[Crankcase]]/<wbr />[[Cylinder block|block]]/[[Cylinder head|head]]<br />construction || Valvetrain ||style="line-height:1.2em;"| [[Compression ratio|Compr.<br />ratio]] ||style="line-height:1.2em;"| Fuel system || Peak power || Top speed
|-
| '''Normale'''((sfnp|Fusi|1978|p=115)) || ((nowrap|1927–29)) ||style="line-height:1.3em;"| [[Aluminium|Alum.]]/[[Cast iron|iron]], [[Monobloc engine|monobloc]] || [[SOHC]] || 5.75:1 ||style="line-height:1.3em;"| Single [[carburettor]] ||style="line-height:1.3em;"| ((convert|44|bhp|kW|0|abbr=on)) ((nowrap|at 4,200 rpm)) ||style="line-height:1.3em;"| ((convert|110|km/h|mph|abbr=on))
|-
| '''Sport'''((sfnp|Fusi|1978|p=127)) || 1928–29 || Alum./iron/iron || [[DOHC]] || 6.0:1 ||style="line-height:1.3em;"| Single carburettor ||style="line-height:1.3em;"| ((convert|54|bhp|kW|0|abbr=on)) ((nowrap|at 4,500 rpm)) ||style="line-height:1.3em;"| ((convert|125|km/h|mph|abbr=on))
|-
| '''Super Sport'''((sfnp|Fusi|1978|p=131)) || 1928–29 || Alum./iron/iron || DOHC || 6.75:1 ||style="line-height:1.3em;"| Twin choke carburettor ||style="line-height:1.3em;"| ((convert|60|bhp|kW|0|abbr=on)) ((nowrap|at 4,800 rpm)) ||style="line-height:1.3em;"| ((convert|125|km/h|mph|abbr=on))
|-
|style="line-height:1.3em;"| '''Super Sport'''<br />((nowrap|'''Compressore'''((sfnp|Fusi|1978|p=131)))) || 1928–29 || Alum./iron/iron || DOHC || 5.25:1 ||style="line-height:1.3em;"| Single carburettor, [[supercharger]] ||style="line-height:1.3em;"| ((convert|76|bhp|kW|0|abbr=on)) ((nowrap|at 4,800 rpm)) ||style="line-height:1.3em;"| ((convert|140|km/h|mph|abbr=on))
|-
|style="line-height:1.3em;"| '''Super Sport<br />Testa Fissa'''((sfnp|Fusi|1978|p=137)) || 1928–29 ||style="line-height:1.3em;"| Alum./iron, monobloc || DOHC || 5.25:1 ||style="line-height:1.3em;"| Single carburettor, supercharger ||style="line-height:1.3em;"| ((convert|84|bhp|kW|0|abbr=on)) ((nowrap|at 5,000 rpm)) ||style="line-height:1.3em;"| ((convert|155|km/h|mph|abbr=on))
|}

===Production===
{|class="wikitable" style="text-align:center; font-size:91%;"
|+ Alfa Romeo 6C 1500, production by model((sfnp|Fusi|1978|p=851))
|-
! Model
|width=80em| 4-seater ||width=80em| 6-seater ||width=80em| Normale ||width=80em| Sport ||width=80em style="line-height:1.3em"| Super Sport<br />Compressore ||width=80em| Super Sport
! Total
|-
! Series
| I || I || II || II || II || II || I–II
|-
! Prod. years
|| 1927–28 || 1927–28 || 1928–29 || 1928–29 || 1929 || 1929 || 1927–29
|-
! Prod. number
| 56 || 506 || 300 || 171 || 15 || 10 || ((formatnum:1058))
|}

==((anchor|6C 1750))6C 1750 (1929–1933)==
((Infobox automobile
| name         = Alfa Romeo 6C 1750
| image        = 1931 Alfa Romeo 6C 1750 Super Gran Sport Testa Fissa p1.JPG
| caption      = 1931 6C 1750 Super Gran Sport Testa Fissa<ref name="louwmanmuseum.nl">((cite web |url=http://www.louwmanmuseum.nl/asp/appmain.asp?appactie=collectiedetail&taalcd=en&collsq=5453 |title=Alfa Romeo 6C 1750 Gran Sport Testa Fissa |website=louwmanmuseum.nl |access-date=2012-01-16 |archive-url=https://archive.today/20130222143919/http://www.louwmanmuseum.nl/asp/appmain.asp?appactie=collectiedetail&taalcd=en&collsq=5453 |archive-date=22 February 2013 |url-status=dead |df=dmy-all ))</ref>
| production   = 1929–1933
| body_style = ((unbulleted list|4-door [[Sedan (car)|saloon]]|4-door [[Torpedo (car)|torpedo]]|2-door [[cabriolet]]|2-door [[Roadster (automobile)|spider]]))
| engine       = 1.7&nbsp;L (1,752&nbsp;cc) [[Straight-six engine|I6]]<br />1.7&nbsp;L (1,752&nbsp;cc) [[supercharged]] I6
| transmission = 4-speed [[Manual transmission|manual]]
| wheelbase    = ((unbulleted list|((convert|3100|mm|in|1|abbr=on)) Turismo((sfnp|Fusi|1978|p=141))|((convert|2920|mm|in|1|abbr=on)) Sport, G.T.((sfnp|Fusi|1978|p=147))|((convert|3160|mm|in|1|abbr=on)) G.T. Compr.((sfnp|Fusi|1978|p=169))|((convert|2745|mm|in|1|abbr=on)) S.S., G.S.((sfnp|Fusi|1978|p=151, 235))))
| length       = 
| width        = 
| height       = 
| weight       = 
| sp = uk
))
The more powerful 6C 1750 (1,752&nbsp;cc, 65 x 88&nbsp;mm) was introduced in 1929 in Rome. The car had a top speed of ((convert|95|mi/h|km/h|abbr=on)), a chassis designed to flex and undulate over uneven surfaces, as well as sensitive geared-up steering.<ref name=simeone>((cite web|last1=Simeone|first1=Frederick|title=1929 Alfa Romeo 6C 1750 SS|url=http://www.simeonemuseum.org/the-collection/automobile-racing-club-of-america/1929-alfa-romeo-6c-1750-ss|publisher=Simeone Foundation Automotive Museum|access-date=10 March 2015))</ref> It was produced in six series between 1929 and 1933. The base model had a single overhead cam. Super Sport and Gran Sport versions had a double overhead cam engine (DOHC). Again, a supercharger was available. Most of the cars were sold as rolling chassis and bodied by coachbuilders such as [[Zagato]], and [[Carrozzeria Touring|Touring Superleggera]]. Additionally there were 3 examples built with [[James Young (coachbuilder)|James Young]] bodywork, one of which is a part of the permanent collection at the [[Simeone Foundation Automotive Museum]] in Philadelphia, PA, USA, in original and unrestored condition.<ref name=simeone/>

In 1929, the 6C won every major racing event in which it was entered, including the Grands Prix of Belgium, Spain, Tunis and Monza, and the [[Mille Miglia]] was won by [[Giuseppe Campari]] and [[Giulio Ramponi]]. The car also won the Brooklands Double Twelve and the [[RAC Tourist Trophy|Ulster TT]]. In 1930 the car again won the Mille Miglia and [[Spa 24 Hours]].<ref name="telegraph.co.uk">((cite web |url=https://www.telegraph.co.uk/motoring/car-manufacturers/alfa-romeo/7861349/Classic-Alfa-Romeo-6C-review.html |title=Classic Alfa Romeo 6C review |website=telegraph.co.uk |access-date=2012-01-20))</ref> Total production was 2,635.

===Gallery of models===
<gallery widths="200" heights="135">
File:Alfa-Romeo 6C-1750-GTC-Touring.JPG|6C 1750 Gran Turismo Compressore Touring Superleggera, 1931
File:Gaisbergrennen 2009 Bergfahrt 123.jpg|6C 1750 Gran Turismo Compressore, 1932
File:1932 Alfa Romeo 6C 1750 Grand Sport Zagato Spider - fvr.jpg|6C 1750 Gran Sport Zagato
File:Piloti Alfa Romeo 5.JPG|[[Giuseppe Campari]] on Alfa Romeo 6C 1750 Compressore; standing in centre (from left) [[Enzo Ferrari]] and [[Achille Varzi]]
File:1933 Alfa Romeo 6C 1750 Gransport Castagna Drophead, front right (Greenwich 2023).jpg|6C 1750 Gran Sport by Castagna, 1933
File:Alfa Romeo 6C 1750 Garavini.jpg|Alfa Romeo 6C 1750 [[Carrozzeria Garavini|Garavini]]
File:Paris - Bonhams 2015 - Alfa Romeo 6C 1750 Grand Sport - 1930 - 002.jpg|1930 Alfa Romeo 6C 1750 by James Young
File:Alfa Romeo 6C 1750 Flying Star.jpg|1931 Alfa Romeo 6C 1750 GS Touring Superleggera 'Flying Star' - built specifically for the 1931 Concorso d’Eleganza Villa d’Este.
File:MHV Alfa-Romeo 6C Gran Sport 1931 01.jpg|1931 6C 1750 Gran Sport with bodywork by Walter Freund.
</gallery>

===6C 1750 GS Zagato/Aprile===
[[File:Alfa Romeo 6C 1750 GS Zagato - Villa d'Este 2014 - (14653465105).jpg|thumb|Lopresto's 6C 1750 GS Zagato-Aprile at Rétromobile, Paris, 2015]]
The 1931 6C 1750 with [[license plate]] number "3710 [[Province of Savona|SV]]" and chassis/engine number #10814331, which is currently owned by notorious rare car collector Corrado Lopresto, is a unique example, whose story is told in Lopresto's bilingual 2015 Skira book ''Best in Show – Capolavori dell'auto italiana dalla collezione Lopresto – Italian Cars Masterpieces from the Lopresto Collection''.

The [[English language|English-language]] section about this car tells:
((excessive quote|date=August 2018))
((quote|
Born with a spyder body by Zagato, this car is a 6C 1750 Gran Sport with Compressor, the sportiest version of the Milanese 6-cylinder, and was sold new to Giovanni Battista Aldo Barabini of [[Genova]] in 1931.<br />After several changes of ownership the car goes back to Alfa Romeo, to be resold in 1933 to [[Dino Carabba]], who in 1934 enrolls in the [[Varese]]-[[Campo dei Fiori di Varese|Campo dei Fiori]] <nowiki>[</nowiki>[[Rallying|rally]]<nowiki>]</nowiki>, coming in fourth in class and eleventh overall.<br />In those years, the 6C probably runs in minor races, changing hands three times before being sold to the body shop Giuseppe Aprile of [[Savona]], in August 1938. Less than a year after, the car is purchased by Brunello Feltri of [[Altare]], [[province of Savona]], but meanwhile, Aprile has completely rebuilt the body of the car with a new ["more" is written here in the [[Italian language|Italian-language]] section] modern and elegant look.<br />The design, so well executed, indicates the work of the most famous designer of that time: [[Mario Revelli di Beaumont]], father of this and many other beautiful bodies.<br />The car so transformed survives [[World War II|the war]] unscathed and changes ownership again in 1956, in [[Liguria]], where it remains still today, rediscovery yet in order ((sic)),<ref>This text section, very much based to the Italian-language version, was intended to mean "rediscovered still ["in ordine", literally meaning "in order", but intended as "undamaged"]".</ref> although with some modifications.<br />The painstaking restoration work has restored it to its original splendor, as well conceived by Revelli: a unique car that blends the great elegance to the sporty temperament of mechanics.
))

A [[plush]] version of the car, manufactured by [[Vitale Barberis Canonico]], was also given, together with the book, to some of Lopresto's friends.

===Specifications===
{|class="wikitable" style="text-align:center; font-size:91%;"
|-
! Model || Years ||style="line-height:1.2em;"| [[Crankcase]]/<wbr />[[Cylinder block|block]]/[[Cylinder head|head]]<br />construction || Valvetrain ||style="line-height:1.2em;"| [[Compression ratio|Compr.<br />ratio]] ||style="line-height:1.2em;"| Fuel system || Peak power || Top speed
|-
| '''Turismo'''((sfnp|Fusi|1978|p=141)) || ((nowrap|1929–33)) || [[Aluminium|Alum.]]/[[Cast iron|iron]]/iron || [[SOHC]] || 5.5:1 ||style="line-height:1.3em;"| Single [[carburettor]] ||style="line-height:1.3em;"| ((convert|46|bhp|kW|0|abbr=on)) ((nowrap|at 4,000 rpm)) ||style="line-height:1.3em;"| ((convert|110|km/h|mph|abbr=on))
|-
| '''Sport'''((sfnp|Fusi|1978|p=147)) || 1929 ||rowspan=2| Alum./iron/iron ||rowspan=2| [[DOHC]] ||rowspan=2| 5.75:1 ||rowspan=2 style="line-height:1.3em;"| Single carburettor||rowspan=2 style="line-height:1.3em;"| ((convert|55|bhp|kW|0|abbr=on)) ((nowrap|at 4,400 rpm)) ||rowspan=2 style="line-height:1.3em;"| ((convert|125|km/h|mph|abbr=on))
|-
| ((nowrap|'''Gran Turismo'''((sfnp|Fusi|1978|p=147)))) || 1930–32
|-
|style="line-height:1.3em;"| '''Gran Turismo<br />Compressore'''((sfnp|Fusi|1978|p=169)) || 1931–32 || Alum./iron/iron || DOHC || 5.0:1 ||style="line-height:1.3em;"| Single carburettor, [[supercharger]] ||style="line-height:1.3em;"| ((convert|80|bhp|kW|0|abbr=on)) ((nowrap|at 4,400 rpm)) ||style="line-height:1.3em;"| ((convert|135|km/h|mph|abbr=on))
|-
| '''Super Sport'''((sfnp|Fusi|1978|p=151)) || 1929 ||Alum./iron/iron || DOHC || 6.25:1 ||style="line-height:1.3em;"| Twin choke carburettor ||style="line-height:1.3em;"| ((convert|64|bhp|kW|0|abbr=on)) ((nowrap|at 4,500 rpm)) ||style="line-height:1.3em;"| ((convert|130|km/h|mph|abbr=on))
|-
|style="line-height:1.3em;"| '''Super Sport<br />Compressore'''((sfnp|Fusi|1978|p=151)) || 1929 ||rowspan=2| Alum./iron/iron ||rowspan=2| DOHC ||rowspan=2| 5.0:1 ||rowspan=2 style="line-height:1.3em;"| Single carburettor, supercharger ||rowspan=2 style="line-height:1.3em;"| ((convert|85|bhp|kW|0|abbr=on)) ((nowrap|at 4,500 rpm)) ||rowspan=2 style="line-height:1.3em;"| ((convert|145|km/h|mph|abbr=on))
|-
| '''Gran Sport'''((sfnp|Fusi|1978|p=151)) || 1930–32
|-
|style="line-height:1.3em;"| '''Super Sport<br />Testa Fissa'''((sfnp|Fusi|1978|p=163)) || 1929 ||rowspan=2 style="line-height:1.3em;"| Alum./iron, [[Monobloc engine|monobloc]]||rowspan=2| DOHC ||rowspan=2| 5.0:1 ||rowspan=2 style="line-height:1.3em;"| Single carburettor, supercharger ||style="line-height:1.3em;"| ((convert|85|bhp|kW|0|abbr=on)) ((nowrap|at 4,800 rpm)) ||style="line-height:1.3em;"| ((convert|165|km/h|mph|abbr=on))
|-
|style="line-height:1.3em;"| '''Gran Sport<br />Testa Fissa'''((sfnp|Fusi|1978|p=163)) || 1930–32 ||style="line-height:1.3em;"| ((convert|102|bhp|kW|0|abbr=on)) ((nowrap|at 5,000 rpm)) ||style="line-height:1.3em;"| ((convert|170|km/h|mph|abbr=on))
|-
| '''Gran Sport'''((sfnp|Fusi|1978|p=235)) || 1933 || Alum./iron/alum. || DOHC || 5.0:1 ||style="line-height:1.3em;"| Single carburettor, supercharger ||style="line-height:1.3em;"| ((convert|85|bhp|kW|0|abbr=on)) ((nowrap|at 4,500 rpm)) ||style="line-height:1.3em;"| ((convert|135|km/h|mph|abbr=on))
|}

===Production===
{|class="wikitable" style="text-align:center; font-size:91%;"
|+ Alfa Romeo 6C 1750, production by model((sfnp|Fusi|1978|p=851))
|-
! Model
|width=80em| Turismo ||width=80em| Sport ||width=80em| Gran Turismo ||width=80em style="line-height:1.3em"| Gran Turismo<br />Compressore ||width=80em| Super Sport ||width=80em| Gran Sport
! Total
|-
! Series
| III, IV || III || IV, V || IV || III || IV, V, VI || III–VI
|-
! Prod. years
| 1929–33 || 1929 || 1930–32 || 1932 || 1929 || 1930–33 || 1929–33
|-
! Prod. number
| 1,131 || 268 || 652 || 159 || 112 || 257 || ((formatnum:2579))
|}

==((anchor|6C 1900))6C 1900 (1933)==
((Infobox automobile
| name         = Alfa Romeo 6C 1900
| image        = 1933 Alfa Romeo 6C 1900 GT Cabriolet by Castagna, front left.jpg
| caption      = 6C 1900 Gran Turismo by Castagna
| production   = 1933
| body_style   = 4-door [[Sedan (car)|saloon]]<br />2-door [[cabriolet]]
| engine       = 1,917&nbsp;cc [[DOHC]] [[Straight-six engine|I6]]
| transmission = 4-speed [[Manual transmission|manual]]
| wheelbase    = ((convert|2920|mm|in|1|abbr=on))<ref name="carfolio.com">((cite web |url=http://www.carfolio.com/specifications/models/car/?car=17721 |title=1933 Alfa Romeo 6C 1900 Gran Turismo |website=carfolio.com |access-date=2012-01-20))</ref>((sfnp|Fusi|1978|p=229))
| length       = 
| width        = 
| height       = 
| weight       = ((convert|1250|kg|lb|0|abbr=on)) saloon<ref name="carfolio.com" />((sfnp|Fusi|1978|p=229))
| sp = uk
))
The '''Alfa Romeo 6C 1900''' was the final derivative of the original 6C 1500, produced in 197 examples during 1933 as a transitional model, before the new 6C 2300 was introduced the following year.((sfnp|Fusi|1978|p=229))
Only built in Gran Turismo guise with a ((convert|2,920|mm|in|1|abbr=on)) wheelbase, the 6C 1900 replaced the corresponding 6C 1750 model.((sfnp|Fusi|1978|p=227–229)) Besides the larger displacement, other notable mechanical changes were aluminium cylinder heads, an improved chassis frame and a new transmission. The same upgrades were applied to the 1933 model 6C 1750 Gran Sport which, together with the 6C 1900, form the sixth series of the 6C. Alfa Romeo offered the 6C 1900 with an in-house 4-door saloon body, while bespoke coachbuilt body styles included 4-seater cabriolets.((sfnp|Fusi|1978|p=227–228))

The double overhead camshaft, naturally aspirated, straight-six engine was bored out from ((convert|66|mm|in|1|abbr=on)) to ((convert|68|mm|in|1|abbr=on)), bringing displacement to ((convert|1917|cc|cuin|1|abbr=on)).((sfnp|Fusi|1978|p=227–229)) For the first time on a 6C the [[cylinder head]] was aluminium;((sfnp|Fusi|1978|p=227–229)) some engines were also manufactured using an aluminium block with pressed-in steel sleeves in place of the usual cast iron block.((sfnp|Fusi|1978|p=229)) With ((cvt|68|hp-metric|kW|0)) ((nowrap|at 4,500 rpm)) the 6C 1900 could achieve a top speed of ((convert|130|km/h|mph|abbr=on)).((sfnp|Fusi|1978|p=229))
The improved chassis frame consisted of fully boxed rails and crossmembers, instead of the 1750's C-shaped sections.((sfnp|Fusi|1978|p=229)) A new four-speed gearbox was fitted, with [[synchromesh]] on the two top gears and a [[freewheel]] mechanism.((sfnp|Fusi|1978|p=229))
[[File:Alfa Romeo 6C 1900cc manufactured 1933.JPG|thumb|left|1933 6C 1900 Gran Turismo Touring Superleggera Spyder.]]

===Specifications===
{|class="wikitable" style="text-align:center; font-size:91%;"
|-
! Model || Years ||style="line-height:1.2em;"| [[Crankcase]]/<wbr />[[Cylinder block|block]]/[[Cylinder head|head]]<br />construction || Valvetrain ||style="line-height:1.2em;"| [[Compression ratio|Compr.<br />ratio]] ||style="line-height:1.2em;"| Fuel system || Peak power || Top speed
|-
| ((nowrap|'''Gran Turismo'''((sfnp|Fusi|1978|p=229)))) || 1933 || [[Aluminium|Alum.]]/[[Cast iron|iron]]/alum. || [[DOHC]] || 6.25:1 ||style="line-height:1.3em;"| Single [[carburettor]] ||style="line-height:1.3em;"| ((cvt|68|hp-metric|kW|0)) ((nowrap|at 4,500 rpm)) ||style="line-height:1.3em;"| ((convert|130|km/h|mph|abbr=on))
|}

===Production===
{|class="wikitable" style="text-align:center; font-size:91%;"
|+style="line-height:1.3em;"| Alfa Romeo 6C 1900,<br />production by model((sfnp|Fusi|1978|p=851))
|-
! Model
|width=80em| Gran Turismo
! Total
|-
! Series
| VI || VI
|-
! Prod. years
| 1933 || 1933
|-
! Prod. number
| 197 || 197
|}
((clear))

==6C 2300 (1934–1938)==
((Infobox automobile
| name        = Alfa Romeo 6C 2300
| image        = Coys vintage car 501593 fh000035.jpg
| caption      = 1938 6C 2300 B Touring Superleggera Spyder
| production   = 1934–1938
| engine       = 2.3&nbsp;L 2,309&nbsp;cc [[Straight-six|I6]]
| transmission =
| wheelbase    = 
| length       = 
| width        = 
| height       = 
| weight       = 
| sp = uk
))
The 6C 2300 (2,309&nbsp;cc, 70 x 100&nbsp;mm) was designed by [[Vittorio Jano]] as a lower-cost alternative to the [[Alfa Romeo 8C|8C]]. In 1934 Alfa Romeo had become a state-owned enterprise. That year, a new 6C model with a newly designed and larger engine was presented. Chassis technology, however, had been taken from the predecessor.
One year later a revised model, the 6C 2300 B, was presented. In this version the engine was placed in a completely redesigned chassis, with independent front suspension and rear swing axle, as well as hydraulic brakes. 760 examples of the rigid-axle 6C 2300 were produced and 870 examples of the B-model.

===Specifications===
{| class="wikitable" style="text-align:center; font-size:91%;"
|-
!Model!!Engine!!Max power!!Fuel system!!Top speed!!Years!!Number produced
|-
|'''6C 2300 Turismo'''||((convert|2309|cc|abbr=on)) DOHC I6||((Convert|68|bhp|kW|0|abbr=on)) @ 4,400 rpm||single carburetor||((convert|120|km/h|mph|abbr=on))||1934||
|-
|'''6C 2300 Gran Turismo'''||((convert|2309|cc|abbr=on)) DOHC I6||((Convert|76|bhp|kW|0|abbr=on)) @ 4,400 rpm||single carburetor||((convert|130|km/h|mph|abbr=on))||1934||
|-
|'''6C 2300 B Gran Turismo'''||((convert|2309|cc|abbr=on)) DOHC I6||((Convert|76|bhp|kW|0|abbr=on)) @ 4,400 rpm||single carburetor||((convert|130|km/h|mph|abbr=on))<ref name="6C 2003 B Gran Turismo">((cite web |url=http://www.6c2500.org/page/?id=20 |title=6C 2003 B Gran Turismo |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152313/http://www.6c2500.org/page/?id=20 |archive-date=2 November 2013 |url-status=dead ))</ref>||1935–1938||
|-
|'''6C 2300 Pescara'''||((convert|2309|cc|abbr=on)) DOHC I6||((Convert|95|bhp|kW|0|abbr=on)) @ 4,500 rpm||double carburetor||((convert|145|km/h|mph|abbr=on))<ref name="6C 2300 Pescara">((cite web |url=http://www.6c2500.org/page/?id=4 |title=6C 2300 Pescara |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152451/http://www.6c2500.org/page/?id=4 |archive-date=2 November 2013 |url-status=dead ))</ref>||1934|| 60((sfn|Fusi|1978|page=251))
|-
|'''6C 2300 B Pescara'''||((convert|2309|cc|abbr=on)) DOHC I6||((Convert|95|bhp|kW|0|abbr=on)) @ 4,500 rpm||double carburetor||((convert|145|km/h|mph|abbr=on))<ref name="6C 2003 B Pescara">((cite web |url=http://www.6c2500.org/page/?id=21 |title=6C 2003 B Pescara |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152356/http://www.6c2500.org/page/?id=21 |archive-date=2 November 2013 |url-status=dead ))</ref>||1935–1938|| 120((sfn|Fusi|1978|page=277))
|-
|'''6C 2300&nbsp;B Corto/Lungo'''||((convert|2309|cc|abbr=on)) DOHC I6||-||-||-||1935||
|-
|'''6C 2300 B Mille Miglia'''||((convert|2309|cc|abbr=on)) DOHC I6||-||-|-||-||
|}

===Gallery of models===
<gallery widths="180" heights="120" perrow="5">
File:Alfa Romeo 6C 2300 Pescara.JPG|1934 6C 2300 Pescara
File:Alfa Romeo 6C 2300 Touring Spider.jpg|6C 2300 Touring Superleggera Spyder
File:1938 Alfa Romeo 6C 2300B Mille Miglia Spyder 186635948.jpg|1938 6C 2300 B Mille Miglia Spyder
File:1938 Alfa Romeo 6C 2300B Touring Superleggera Coupe - fvl.jpg|1938 6C 2300 B Touring Superleggera Berlinetta
File:Alfa 6C 2300 Pescara.jpg|1935 6C 2300 Sport Touring Superleggera Pescara Spyder. Mille Miglia 1936 entrant and ex Benito Mussolini car<ref name="kidston.com">((cite web|url=http://www.kidston.com/kidston-cars/2162/1935-Alfa-Romeo-6C-2300-|title=1935 Alfa Romeo 6C 2300 Sport Spyder|website=kidston.com|access-date=2012-01-21))</ref>
File:1937 Alfa Romeo 2300 Pescara Pinin Farina Berlinetta - green - fvr.jpg|1937 6C 2300 B Pescara
File:Paris - Bonhams 2015 - Alfa Romeo 6C 2300B Pescara Berlinetta - 1937 - 007.jpg|1937 6C 2300 B Pescara Pinin Farina Berlinetta
File:MHV Alfa-Romeo 6C2300b Ministeriale 1938 01.jpg|1938 6C 2300 B Ministeriale
</gallery>

((Clear))

===Aerodinamica Spyder===
((Infobox automobile
| name = Alfa Romeo Aerodinamica Spyder
| image = 1937 Alfa Romeo 6C 2300 "Aerodinamica Spider" (cropped).jpg
| caption = The Aerodinamica Spyder at the 2012 [[Goodwood Revival]]
| wheelbase = ((convert|2800|mm|in|1|abbr=on))
| length = ((convert|4750|mm|in|1|abbr=on))
| width = ((convert|1720|mm|in|1|abbr=on))
| height = ((convert|1030|mm|in|1|abbr=on))
| weight = ((convert|950|kg|lb|0|abbr=on)) (dry)
| sp = uk
))
((more citations needed section|date=December 2015))
((Cleanup section|reason=convert to prose|date=July 2016))

The Alfa Romeo Aerodinamica Spyder was a [[one-off]] [[Mid-engine design|mid-engine]] [[streamliner|streamlined]] prototype, built by brothers Gino and Oscar Jankovitz in connection with Alfa Romeo between 1935 and 1937 in [[Fiume]] (today Rijeka), and should have been powered by an Alfa Romeo 12-cylinder engine.<ref name="Alfa-Janko RC">((cite journal|last1=Marchianò|first1=Michele|title=Alfa Romeo-Jankovits "6 C 2300" 1938 – L'impresa di Fiume|journal=Ruoteclassiche|date=October 2005|volume=202|issue=Ottobre 2015|pages=56–61|url=http://ruoteclassiche.quattroruote.it/auto-moto/automobili/alfa-romeo/|access-date=4 September 2015|archive-url=https://web.archive.org/web/20150926035832/http://ruoteclassiche.quattroruote.it/auto-moto/automobili/alfa-romeo/|archive-date=26 September 2015|url-status=dead))</ref>
The construction of the car took many years, while technical changes had to be made due to the testing period from 1936 to 1937.
The Aerospyder represents:
* The first “modern” mid-engined sports car design.<ref name="klassiekerweb.nl">Klassiekerweb: [https://www.klassiekerweb.nl/merken/alfa-romeo/6c/alfa-romeo-6c-2300/ Alfa Romeo 6C 2300 Aerospyder - Klassiekerweb], access-date: 26. October 2018</ref>
* The first mid-engined car with central driving position (albeit Lancia deposited a patent for a centrally driven design in 1934).<ref name="klassiekerweb.nl"/>
* The first car designed to take account of newly developed principles of aerodynamics, to provide low drag both externally and internally.<ref name="klassiekerweb.nl"/>
* The first car which was designed for high speeds, by using a body which fully enveloped the underside of the car to reduce air turbulence beneath it and an aerodynamic front design to reduce front lift of the car<ref name="klassiekerweb.nl"/>

====History====
Between 1935 and 1937 the Jankovits carried out the construction; a "rolling chassis" could be registered in Fiume (number plate: 2757 FM) tested, and subsequently modified.
[[File:Alfa 6C Aerodinamica 1.jpg|thumb|The engine compartment of the Alfa Aerodinamica Spyder]]

The No.700316 6C 2300 Tipo Turismo straight-six engine placed behind the driver was Alfa Romeo: 2,309&nbsp;cc, iron block, light alloy head, chain-driven dual overhead camshafts, spur gears, wet sump lubrication.
The Jankovits fitted exhaust pipes of equal length and improved intake of air to reduce the pressure drop. Later the engine was upgraded with three dual [[Weber carburetor|Weber]] 36 D 04 [[carburettor]]s, a configuration used on the 6C 2500 SS of 1939.
The transmission was the 4-speed [[gearbox]] from the 6C 2300, mounted with a [[Rag joint|Hardy disc]] behind the engine originally fitted, which they removed. A differential unit from a Lancia Lambda was later fitted instead. A unique pre-selector gear change system was also developed. The clutch was hydraulically assisted.

The [[ladder chassis]] was made by Alfa Romeo for the central-mounted engine, with straight rails from front to the rear end of the car; it was numbered 700316 in accordance with the engine number.
The final suspension was [[Independent suspension|all-independent]], with "silent bloc" bushes;
at the front it consisted of [[Double wishbone suspension|double wishbones]], with a thick sheet steel (4&nbsp;mm) upper wishbone, lever-arm [[Houdaille Industries | Houdaille shock absorber]] hydraulic [[Shock absorber|dampers]], longitudinal [[Torsion bar suspension|torsion bars]], and lower location through a transverse [[leaf spring]]; at the rear it had [[swing axle]]s and [[radius arm]]s, with a transverse leaf spring and longitudinal torsion bars.

[[Steering]] was worm and sector with Hardy disc.
Brakes used a two-circuit hydraulic system (two fluid distributors and two master cylinders, one for the front and one for the rear), Lockheed-type duplex brakes with ((convert|17|x|2|in|mm|adj=on)) drums all round. An equaliser was fitted, which could avoid overbraking by changing the distribution of braking force between the front and rear brakes during driving.
5.50–18 racing crossply [[Tire|tyres]] were mounted on Alfa Romeo 18-inch Rudge-type [[wire wheel]]s.
[[File:Alfa Romeo Aerodinamica Spider.jpg|thumb|left|The Aerodinamica Spyder at the 2011 [[Goodwood Festival of Speed]]]]

The aerodynamic shape of the car was designed by Oscar Jankovits, probably inspired by contemporary aerodynamic theories such as [[Paul Jaray]]'s, and built at the Jankovits' garage between 1935 and 1937. It was a barchetta with central driving position and fully integrated wings ([[Ponton (automobile)|pontoon styling]]). The bodyshell was streamlined to minimise turbulence in the air flow, fully enveloping the underbody and integrating door handles and lights.
A horizontally mounted radiator made it possible to design an exceptionally low front profile for a pre-war car.
Air inlets were positioned in zones of high air pressure, and hot air outlets from the engine and brakes in areas of low pressure.
Top speed was in excess of ((convert|140|mph|km/h|0|abbr=on)).

During the [[Second World War]] the completed prototype remained hidden in the Jankovits' garage in Fiume. After the war the Jankovits, in need of money, had to sell their car to an Anglo-American officer.
On Christmas Eve 1946, with a temporary registration document, Gino Jankovits drove the Aerospyder through the closed border into Italy causing a border shootout. Then the Alfa disappeared for about 30 years until it was rediscovered in England. In 1978, well-known Alfa Romeo historian Luigi Fusi put the then-owner of the car in contact with the Jankovits, and tried to buy the car for the Alfa museum. The acquisition failed, but the prototype had been painted blue, and then green as this was the original colour. The car still has its original licence plate and registration documents.
((clear))

==6C 2500 (1938–1952)==
((Infobox automobile
| name         = Alfa Romeo 6C 2500
| image        = Alfa Villa d Este.JPG
| caption      = 6C 2500 Villa d'Este
| production   = 1938–1952
| successor    = [[Alfa Romeo 1900]]
| platform     = 
| engine       = 2.5&nbsp;L 2,443&nbsp;cc [[Straight-six engine|I6]]
| transmission = 4-speed [[Manual transmission|manual]]
| wheelbase    = ((Convert|3,250|mm|in|1|abbr=on)) (Turismo)<br />((Convert|3,000|mm|in|1|abbr=on)) (Sport)<br />((Convert|2,700|mm|in|1|abbr=on)) (Super Sport)
| length       = 
| width        = 
| height       = 
| weight       = 
| sp = uk
))
[[File:Alfa Romeo 6C2500 Super Sport Corsa (1939) Solitude Revival 2019 IMG 1585.jpg|thumb|Alfa Romeo 6C 2500 Super Sport Spyder Corsa]]

Introduced in 1938, the 2500 (2,443&nbsp;cc) was the final 6C road car. [[World War II]] was coming and car development was stopped, but a few hundred 6C 2500s were built from 1940 to 1945. Postwar, the first new Alfa model was the 1946 6C 2500 ''Freccia d'Oro'' (Golden Arrow), of which 680 were built until late 1951, with bodies by Alfa. The 2500 had an enlarged engine compared to the predecessor model; this Vittorio Jano designed dual overhead cam engine was available with either one or three [[Weber carburetor]]s. The triple carburetor version was used in the top-of-the-range SS (Super Sport) version. The 2,443 cc straight-six engine was bored out from ((convert|70|mm|in|1|abbr=on)) to ((convert|72|mm|in|1|abbr=on)) and was mounted onto a steel ladder frame chassis, which was offered with three wheelbases: ((Convert|3,250|mm|in|1|abbr=on)) on the Turismo, ((Convert|3,000|mm|in|1|abbr=on)) on the Sport and ((Convert|2,700|mm|in|1|abbr=on)) on the Super Sport. Various coachbuilders built their own bodied versions of the 2500, but most bodywork was built by Touring Superleggera of Milan.<ref name="ultimatecarpage.com">((cite web |url=http://www.ultimatecarpage.com/car/4688/Alfa-Romeo-6C-2500-SS-Bertone-Coupe.html |title=Alfa Romeo 6C 2500 SS Bertone Coupe |website=ultimatecarpage.com |access-date=2012-01-20))</ref>

The Tipo 256 was a racing version of 2500 made in eight examples between 1939 and 1940 for the Mille Miglia and the Le Mans 24 Hours.<ref name="ultimatecarpage.com"/> It was made in Spider (convertible) and Berlinetta (coupe) Touring bodystyles. With a power of ((Convert|125|bhp|kW|0|abbr=on)) it could achieve a top speed of ((convert|200|km/h)).<ref name="6c2500.org">((cite web |url=http://www.6c2500.org/page/?id=31 |title=256 |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152541/http://www.6c2500.org/page/?id=31 |archive-date=2 November 2013 |url-status=dead ))</ref>

The car was sold to wealthy customers like [[Farouk of Egypt|King Farouk]], [[Prince Aly Khan|Alì Khan]], [[Rita Hayworth]], [[Tyrone Power]], and [[Prince Rainier of Monaco|Prince Rainier]]. One was also featured in ''[[The Godfather]]'' in 1972.<ref>((cite web|title=1946 Alfa Romeo 6C 2500 'Freccia d'Oro'|url=http://imcdb.org/vehicle_3017-Alfa-Romeo-6C-2500-1946.html|website=imcdb.org|access-date=6 December 2014))</ref><ref name="italiaspeed.com">((cite web |url=http://www.italiaspeed.com/2006/motor_shows/geneva/automobile_revue/0903.htm |title=100&nbsp;years of automobile revue |website=italiaspeed.com |access-date=2007-06-07))</ref>

The 2500 was one of the most expensive cars available in its time.<ref name="ultimatecarpage.com"/> The final 6C was built in 1952 and the model was replaced by the [[Alfa Romeo 1900|1900]].

All 6C 2500 vehicles are catalogued, together with chassis specifications, known fate, technical and race data and first owners, in the [[Editoriale Domus]] book ''Alfa Romeo 6C 2500'' (written by Angelo Tito Anselmi).

===Specifications===
{| class="wikitable" style="text-align:center; font-size:91%;"
|-
!Model!!Engine!!Max power!!Fuel system!!Top speed!!Years!!Number produced
|-
|'''6C 2500 Coloniale'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|90|bhp|kW|0|abbr=on)) @ 4,500 rpm||single carburetor|| ((Convert|127|km/h|mi/h|0|abbr=on))<ref name="Coloniale">((cite web |url=http://www.6c2500.org/page/?id=30 |title=Coloniale |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152218/http://www.6c2500.org/page/?id=30 |archive-date=2 November 2013 |url-status=dead ))</ref>||1939–1942||152
|-
|'''6C 2500'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|90|bhp|kW|0|abbr=on)) @ 4,600 rpm||single carburetor||-||1938–1949||
|-
|'''6C 2500 Turismo'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|87|hp|kW|0|abbr=on))||single carburetor||-||1935–1937||
|-
|'''6C 2500 Sport'''||((convert|2,443|cc|abbr=on)) DOHC I6|| ((Convert|95|bhp|kW|0|abbr=on)) @ 4,600 rpm (1939–1946)<br /> ((Convert|90|bhp|kW|0|abbr=on)) (1947–1952)||single carburetor|| ((Convert|155|km/h|mi/h|0|abbr=on))<ref name="Sport">((cite web |url=http://www.6c2500.org/page/?id=25 |title=Sport |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152309/http://www.6c2500.org/page/?id=25 |archive-date=2 November 2013 |url-status=dead ))</ref>||1939–1952||13
|-
|'''6C 2500 Super Sport'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|110|bhp|kW|0|abbr=on)) @ 4,800 rpm||double carburetor||	((Convert|170|km/h|mi/h|0|abbr=on)) (1939–1946)<br />((Convert|165|km/h|mi/h|0|abbr=on)) (1947–1951)<ref name="Super Sport">((cite web |url=http://www.6c2500.org/page/?id=26 |title=Super Sport |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131101201031/http://www.6c2500.org/page/?id=26 |archive-date=1 November 2013 |url-status=dead ))</ref>||1939–1951||413 Coupés
|-
|'''6C 2500 Super Sport Spyder Corsa'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|120|bhp|kW|0|abbr=on)) @ 4,750 rpm<ref name="supercars.net/cars/">((cite web |url=http://www.supercars.net/cars/1571.html |title=1939 Alfa Romeo 6C 2500 SS Corsa |website=supercars.net/cars/ |access-date=2008-08-30))</ref>||triple carburetor||-||1939–1940||8
|-
|'''6C 2500 Sport Pinin Farina'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|95|bhp|kW|0|abbr=on)) @ 4,600 rpm||single carburetor|| ((Convert|155|km/h|mi/h|0|abbr=on))<ref name="Pininfarina">((cite web |url=http://www.rmw.lv/page/en/Model-story-6C2500S |title=Model Story |website=6c2500.org |access-date=2013-10-09))</ref>||1941–1943||8
|-
|'''6C 2500 Freccia d'Oro'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|90|bhp|kW|0|abbr=on)) @ 4,600 rpm||single carburetor|| ((Convert|155|km/h|mi/h|0|abbr=on))<ref name="Freccia d'oro">((cite web |url=http://www.6c2500.org/page/?id=27 |title=Sport "Freccia d'oro" |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152104/http://www.6c2500.org/page/?id=27 |archive-date=2 November 2013 |url-status=dead ))</ref>||1946–1951||680
|-
|'''6C 2500 Villa d'Este'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|110|bhp|kW|0|abbr=on)) @ 4,800 rpm||triple carburetor||-||1949–1952||36
|-
|'''6C 2500 Gran Turismo'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|110|bhp|kW|0|abbr=on)) @ 4,800 rpm||triple carburetor|| ((Convert|170|km/h|mi/h|0|abbr=on))<ref name="Gran Turismo">((cite web |url=http://www.6c2500.org/page/?id=29 |title=Gran Turismo |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152543/http://www.6c2500.org/page/?id=29 |archive-date=2 November 2013 |url-status=dead ))</ref>||1950–1953||
|-
|'''6C 2500 Competizione'''||((convert|2,443|cc|abbr=on)) DOHC I6||((Convert|145|bhp|kW|0|abbr=on)) @ 5,500 rpm||triple carburetor|| ((Convert|200|km/h|mi/h|0|abbr=on))<ref name="Competizione">((cite web |url=http://www.6c2500.org/page/?id=32 |title=Competizione |website=6c2500.org |access-date=2012-01-20 |archive-url=https://web.archive.org/web/20131102152304/http://www.6c2500.org/page/?id=32 |archive-date=2 November 2013 |url-status=dead ))</ref>||1948||3
|}

===6C 2500 Freccia d'Oro===
[[File:Alfa Romeo 6C Freccia d'Oro 1949.jpg|thumb|right|1949 Alfa Romeo 6C 2500 Sport "Freccia d'Oro"]]
The 6C 2500 Freccia d'Oro (Golden Arrow) was the first postwar Alfa Romeo. 680 were built until 1951, with bodies by Alfa. The car was a [[Sedan (automobile)|Berlina]] bodystyle with 5–6 seats based on the 2500 Sport. It has a wheelbase of ((convert|3,000|mm)) and it weighs ((convert|1,550|kg)).<ref name="uniquecarsandparts.com.au">((cite web|url=http://www.uniquecarsandparts.com.au/specifications/alfa_romeo/1947_alfa_romeo_6c_2500_sport_freccia_d%27oro.htm|title=Specifications: Alfa Romeo 6C 2500 Sport Freccia D'oro|access-date=2012-01-20|website=uniquecarsandparts.com.au))</ref> With a 4-speed manual gearbox this ((Convert|90|bhp|kW|0|abbr=on)) car could achieve a top speed of ((convert|155|km/h)).
((clear))

===6C 2500 Villa d'Este===
[[File:1949 Alfa Romeo 6C 2500 SS Villa d'Este (Touring), Lime Rock.jpg|thumb|right|1949 Alfa Romeo 6C 2500 Super Sport Villa d'Este (Touring Superleggera) at the 2014 Lime Rock Concours d'Élegance.]]
The 6C 2500 ''Villa d'Este'' was introduced in 1949 as a Berlinetta with coachwork by Touring Superleggera of Milan. The Villa d'Este used the 6C 2500 Super Sport chassis with a 110 bhp six-cylinder, 2,443 cc engine. Alfa Romeo chose the name 'Villa d’Este' after this design won the Concorso d’Eleganza,<ref name="supercars.net">((cite web |url=http://www.supercars.net/cars/1951.html |title=1949 Alfa Romeo 6C 2500 Villa d'Este |website=supercars.net |access-date=2007-06-07))</ref> which was held at the historic resort on [[Lake Como]] in northern Italy. The 'Villa d'Este' was Alfa's last handbuilt model, with only 36 examples being built (including 5 cabriolets). 6C 2500 production ended in 1952 (although a couple of racing examples were produced in 1953).
((clear))

===6C 2500 Coloniale===
[[File:Alfa Romeo 6C 2500 Coloniale.jpg|thumb|right|Alfa Romeo 6C 2500 Coloniale]]
The 6C 2500 Coloniale was a [[staff car]] version of the third series 6C 2500.<ref name="esercito.difesa.it">((cite web |url=http://www.esercito.difesa.it/Equipaggiamenti/mezzi_storici/ruotati/Italiani/Pagine/AlfaRomeo6C2500Coloniale.aspx |title=Alfa Romeo "6C 2500 Coloniale" |website=esercito.difesa.it |language=IT |access-date=2012-01-16 |archive-url=https://web.archive.org/web/20130622001413/http://www.esercito.difesa.it/Equipaggiamenti/mezzi_storici/ruotati/Italiani/Pagine/AlfaRomeo6C2500Coloniale.aspx |archive-date=22 June 2013 |url-status=dead |df=dmy-all ))</ref> It was commissioned in 1938 by the Italian Ministry of Defence, for military use in the [[Italian Empire|Italian colonies]].((sfn|Fusi|1978|pages=397–400)) Two prototypes of the 6C 2500 Coloniale were manufactured in 1939. One was shipped to [[Italian East Africa]], where Giambattista Guidotti, winner of the 1937 Mille Miglia driving an Alfa Romeo 8C 2300 B, was instructed to conduct testing in the harsh operational conditions. The car was the first to be manufactured using technology developed by the renowned [[Carrozzeria Touring Superleggera|Carrozzeria Touring]], the Superleggera. The car had two spare wheels, a fuel tank of 120 litres and four additional reserve tanks with a capacity of 70 litres of gasoline. In addition there was a [[locking differential]], engaged from the dashboard by the driver. Regular production began in 1941 and the first batch of 150 vehicles was delivered between 1941 and 1942; production was then halted due to [[World War II|war events]]((sfn|Fusi|1978|pages=397–400)) Total production amounted to 150 series cars plus two prototypes.
((clear))

===6C 2500 Sport Pinin Farina===

The 6C 2500 Pinin Farina was manufactured during the Second World War until 1943, when Alfa Romeo manufacture was switched to the technical needs of the army. The vehicles of the 1943 build series had only their chassis and the transmission assembled on the factory production line; the bodywork and interior build being undertaken by the Italian design studio [[Pinin Farina]].

===Gallery of 6C 2500 models===
<gallery widths="180" heights="120" perrow="5">
File:Paris - RM Auctions - 5 février 2014 - Alfa Romeo 6C 2500 Cabriolet - 1939 - 002.jpg|1939 6C 2500 Cabriolet by Gebrüder Tüscher of Zurich. Chassis no: 913014
File:Alfa Romeo 6C-2500SS 1939.jpg|6C 2500 Super Sport Corsa, rebodied to Mille Miglia Spyder configuration by Conrad Stevenson.<ref name="supercars.net2">SuperCars.net: [https://www.supercars.net/blog/1939-alfa-romeo-6c-2500-ss-spider-corsa/ 1939 Alfa Romeo 6C 2500 SS Spider Corsa|Alfa Romeo|SuperCars.net], access-date: 28. October 2018</ref>
File:1939 Alfa Pomeo 6C Castagna Berlinetta - fvr.jpg|1939 6C 2500 Sport Castagna Berlinetta
File:RM Sotheby’s 2017 - Alfa Romeo 6C 2500 S cabriolet - 1948 - 002.jpg|6C 2500 Super Sport Pinin Farina Cabriolet
File:Alfa-Romeo 6c-2500-SS-Coupé.JPG|6C 2500 Super Sport Pinin Farina Berlinetta
File:1939 Alfa Romeo 6C 2500 Sport Berlinetta by Touring, front right (Greenwich 2021).jpg|1939 6C 2500 Sport Touring Superleggera Berlinetta
File:Paris - RM Auctions - 5 février 2014 - Alfa Romeo 6C 2500 Sport coupé - 1948 - 003.jpg|1948 6C 2500 Super Sport Touring Superleggera Berlinetta
File:Rétromobile 2016 - Alfa Romeo 6C 2500 Competizione Coupé - 1948 - 004.jpg|1948 6C 2500 Competizione Berlinetta (bodied in-house)
File:1949 Alfa Romeo 6C 2500 SS Villa d'Este Carrozzeria Touring Berlinetta - fvl.jpg|1949 6C 2500 Super Sport 'Villa d'Este' Touring Superleggera Berlinetta
File:Alfa Romeo 6C 2500 SS - MM 2014 - (14055528997).jpg|1949 6C 2500 Super Sport 'Villa d'Este' Touring Superleggera Berlinetta at the 2014 Mille Miglia.
File:Alfa Romeo (27163008188).jpg|1942–1946 6C 2500 Pinin Farina Cabriolet Speciale
File:62° Coppa Intereuropa - Autodromo Nazionale Monza - 21-06-2015 (19204364616).jpg|1947 Alfa Romeo 6C 2500 SS [[Stabilimenti Farina]] Cabriolet
File:1947 Alfa Romeo 6C 2500 Sport Freccia d'Oro rear.jpg|Rear view of the Freccia d'Oro at the Alfa Romeo museum
File:1950 Alfa Romeo 6C 2500 Super Sport Villa d'Este rear.jpg|Rear view of the Super Sport Villa d'Este at the Alfa Romeo museum
</gallery>

((Clear))

==6C 3000 (1948–1954)==
In 1948 a first '''Alfa Romeo 6C 3000''' prototype was built.((sfn|Fusi|1978|pages=435–436)) It was a 5–6 passenger 4-door [[Sedan (car)|saloon car]] of the same class as the 6C 2500, but which could be built using more modern and economical manufacturing processes.((sfn|Fusi|1978|pages=435–436))

Like its predecessor, the three-litre engine had a [[cast iron]] [[Engine block|block]], an aluminium [[Cylinder head|head]] with [[hemispherical combustion chamber]]s, two [[Poppet valve|valves]] per cylinder, angled 90° and timed by directly acting, chain driven [[dual overhead camshaft]]s. Fed by a twin-choke [[carburettor]], it developed ((convert|120|PS|kW|0|abbr=on)), sent to the rear wheels through a 4-speed all-[[synchromesh]] [[Manual transmission|gearbox]] with a [[Manual transmission#Column-mounted shifter|column-mounted shifter]] as on the 6C 2500.
The car used [[unit body construction]], had a [[wheelbase]] of ((convert|3.05|m|in|0|abbr=on)) and a [[dry weight]] of 1,400&nbsp;kg.((sfn|Fusi|1978|pages=435–436)) The all-[[independent suspension]] was of the [[Double wishbone suspension|double wishbone type]] with [[coil spring]]s upfront, and [[trailing arm]] type with transverse [[torsion bar]]s at the rear.((sfn|Fusi|1978|pages=435–436))

After three prototypes had been made between 1948 and 1949, the project was abandoned when market analysis and product planning suggested the development of a smaller four-cylinder car—the [[Alfa Romeo 1900]].((sfn|Fusi|1978|pages=435–436))
Despite this, the 3-litre engine was developed for competition use and gave birth to a number [[sports racing car]]s during the first half of the 1950s: the 6C 3000 C50, 6C 3000 CM and 6C 3000 PR.

===Specifications===
{| class="wikitable" style="font-size:90%; text-align:center; line-height:1.2em;"
! Model || Engine || Displacement<br />Bore x stroke || [[Compression ratio|Compr.<br />ratio]] || [[Carburettor]](s) || Peak power || Top speed
|-
| '''6C 3000'''((sfn|Fusi|1978|pages=435–436)) ||rowspan=4| [[Straight-six engine|I6]] [[DOHC]] ||rowspan=2| 2,955 cc<br />((nowrap|82.55&thinsp;x&thinsp;92 mm)) || 7.5:1 || 1x&nbsp;downdraught<br />twin-choke || ((convert|120|PS|kW|0|abbr=on)) ((nowrap|at 4,800 rpm)) || ((convert|166|km/h|mph|0|abbr=on))
|-
| ((nowrap|'''6C 3000 C50'''))((sfn|Fusi|1978|pages=437–438)) || 8.6:1 || 3x&nbsp;sidedraught<br />twin-choke || ((convert|168|PS|kW|0|abbr=on)) ((nowrap|at 6,000 rpm)) || ((convert|226|km/h|mph|0|abbr=on))
|-
| '''6C 3000 CM'''((sfn|Fusi|1978|pages=487–494)) || 3,495 cc<br />((nowrap|87&thinsp;x&thinsp;98 mm)) || 8.2:1 || 6x&nbsp;sidedraught<br />single-choke || ((convert|246|PS|kW|0|abbr=on)) or ((convert|275|PS|kW|0|abbr=on)) ((nowrap|at 6,500 rpm)) || ((convert|250|km/h|mph|0|abbr=on))
|-
| '''6C 3000 PR'''((sfn|Fusi|1978|pages=495–496)) || 2,943 cc<br />((nowrap|87&thinsp;x&thinsp;83 mm)) || – || 6x&nbsp;sidedraught<br />single-choke || ((convert|260|PS|kW|0|abbr=on)) ((nowrap|at 7,000 rpm)) || ((convert|260|km/h|mph|0|abbr=on))
|}

===6C 3000 C50===
In 1950 a 6C 3000 engine from the prototypes was tuned for racing and installed in a 6C 2500 Competizione, which became the '''6C 3000 C50'''.((sfn|Fusi|1978|pages=437–438)) Being based on a 6C 2500 chassis, the car had a [[ladder frame]] with a ((convert|2.50|m|in|0|abbr=on)) wheelbase, and a dry weight of ((convert|870|kg|lbs|0|abbr=on)).((sfn|Fusi|1978|pages=437–438)) Three twin-choke carburettors and a raised compression ratio brought the output of the three-litre straight six to ((convert|168|PS|kW|0|abbr=on)).((sfn|Fusi|1978|pages=437–438))
This one-off racing car was entered at the 1950 [[Mille Miglia]] with number 740, driven by [[Consalvo Sanesi|Sanesi]] and Bianchi; the car did not finish the race, as the two had to withdraw near [[Ferrara]].((sfn|Fusi|1978|pages=437–438))

===6C 3000 CM===
((Infobox racing car
| Car_name = Alfa Romeo 6C 3000 CM<br />Alfa Romeo 6C 3000 PR
| Image = 1953 Alfa Romeo 3000CM.jpg
| Caption = The 6C 3000 CM spider of [[Museo Storico Alfa Romeo]] at [[Goodwood Festival of Speed]] 2009
| Category = 
| Constructor = [[Alfa Romeo]]
| Designer = 
| Predecessor = 
| Successor = 
| Team = 
| Drivers = 
| Technical ref = ((sfn|Fusi|1978))
| Chassis = Tube spaceframe with [[Backbone chassis|backbone]]
| Front suspension = [[Double wishbone suspension|Double wishbones]], [[coil spring]]s, hydraulic [[Shock absorber|dampers]], [[anti-roll bar]]
| Rear suspension = [[De Dion tube]], torque arms, coil springs, hydraulic dampers
| Length = 
| Width = 
| Height = 
| Wheelbase = ((convert|2.25|m|in|1|abbr=on)) (CM)<br />((convert|2.20|m|in|1|abbr=on)) (PR)
| Engine name = 
| Capacity =  ((convert|3495|cc|cuin|1|abbr=on)) (CM)<br />((convert|2943|cc|cuin|1|abbr=on)) (PR)
| Configuration =
| Turbo/NA = 
| Engine position = 
| Gearbox name = 
| Gears = 5-speed,
| Type = 
| Differential = [[limited slip differential]]
| Steering = 
| Weight = ((convert|960|kg|lb|1|abbr=on)) (CM coupé)<br />((convert|930|kg|lb|1|abbr=on)) (CM spider)<br />((convert|920|kg|lb|1|abbr=on)) (PR)
| Fuel = 
| Lubricants = 
| Brakes = [[Hydraulic brake|Hydraulic]], [[Drum brake|drums]], rears [[Inboard brake|inboard]]
| Tyres = 
| Debut = 
| First_win =
| Last_win =
| Last_event =
| Entries =
| Races = 
| Wins = 
| Podiums = 
| Poles = 
| Fastest_laps =
| Titles = 
| Cons_champ = 
| Drivers_champ = 
| Teams_champ = 
))

In 1952 engine parts of the 6C 3000 were used again on the '''6C 3000 CM'''—for ''Competizione Maggiorata'' or Competition Enlarged Displacement.

The powerplant comes from a project by [[Giuseppe Busso]]. It differed from its predecessor by still using several components of the 3-litre engine from the 6C 3000 prototype, but engine capacity was increased to ((convert|3,495|cc|cid|abbr=on)).

The chassis was a tube frame based around a centre [[Backbone chassis|backbone]]; suspension was by [[Double wishbone suspension|double wishbone]]s and [[De Dion tube]] at the rear.((sfn|Fusi|1978|pages=487–494)) Six examples were built: four coupés and two spiders, bodied by [[Carrozzeria Colli]].((sfn|Fusi|1978|pages=487–494))<ref name="ultimatecarpage">((cite web |url=http://www.ultimatecarpage.com/car/2162/Alfa-Romeo-6C-3000-CM-Colli-Coupe.html |title=Alfa Romeo 6C 3000 CM Colli Coupe |website=ultimatecarpage.com |access-date=2009-06-25))</ref><ref name="ultimatecarpage.com/car">((cite web |url=http://www.ultimatecarpage.com/car/3363/Alfa-Romeo-6C-3000-CM-Colli-Spider.html |title=Alfa Romeo 6C 3000 CM Colli Spider |website=ultimatecarpage.com/car |access-date=2009-06-25))</ref>

====Competition history====
A coupé was driven by [[Juan Manuel Fangio]] and [[Giulio Sala]] to a second overall finish at the 1953 [[Mille Miglia]].((sfn|Fusi|1978|pages=487–494))<ref name="italiaspeed.com/2009">((cite web |url=http://www.italiaspeed.com/2009/cars/others/events/goodwood_festival_of_speed/alfa_romeo_cathedral/0807.html |title=Alfa Romeo Museum cars take centre stage at Goodwood |website=italiaspeed.com |year=2009 |access-date=2009-07-08))</ref> For the Mille Miglia the engine had been tuned to put out ((convert|275|PS|kW|0|abbr=on)).((sfn|Fusi|1978|pages=487–494)) Fangio was leading the race, but a problem with the steering forced him to slow down.
Again with Fangio at the wheel, a spider won the 1st [[Gran Premio Supercortemaggiore]] held in [[Merano]] in 1953.((sfn|Fusi|1978|pages=487–494))

====((anchor|Alfa Romeo Superflow))Fate====
[[File:1956 Alfa Romeo 3000 CM Superflow IV fvl.jpg|thumb|left|1960 Alfa Romeo Superflow IV]]
With the end of its racing career, the 1953 Supercortemaggiore winner 6C 3000 CM spider was used by the Experimemtal Department of Alfa Romeo for testing new components. Amongst them were [[disc brake]]s, installed in 1955, which are still present today on this vehicle,((sfn|Fusi|1978|pages=487–494)) part of the [[Museo Storico Alfa Romeo]] collection.

The ex-1953 Mille Miglia coupé was given to [[Pinin Farina]], and rebodied four times into four different [[show car]]s to [[Aldo Brovarone]]'s design:<ref name="coachbuild.com">((cite web |url=http://www.coachbuild.com/index.php?option=com_gallery2&Itemid=50&g2_itemId=1952 |title=Pininfarina Alfa Romeo 6C 3000 CM Super Flow |website=coachbuild.com |access-date=2010-05-28 |archive-date=3 October 2011 |archive-url=https://web.archive.org/web/20111003145728/http://www.coachbuild.com/index.php?option=com_gallery2&Itemid=50&g2_itemId=1952 |url-status=dead ))</ref>
* 1956: '''Alfa Romeo Superflow'''. Shown at the [[Turin Motor Show#1956|1956 Turin Motor Show]], coupé body with [[plexiglas]] front wings and tail fins.
* 1956: '''Alfa Romeo Superflow II'''. Shown at the 1956 [[Paris Motor Show]], coupé body with steel wings and tail fins.
* 1959: '''Alfa Romeo Spider Super Sport'''. Shown at the [[Geneva Motor Show#1959|1959 Geneva Motor Show]], [[roadster (automobile)|roadster]] body without tail fins.
* 1960: '''Alfa Romeo Superflow IV'''. Shown at the [[Geneva Motor Show#1960|1960 Geneva Motor Show]], coupé body without tail fins. The car survives today in this last configuration.

====6C 3000 PR====
One of the two 6C 3000 CM spiders was modified to cope with the new rules of the International Sport Category, enacted in the 1954 season, which limited engine capacity to 3 litres.((sfn|Fusi|1978|pages=495–496)) The 3000 CM's 3.5-litre straight-six was de-[[Stroke (engine)|stroked]] to 2,943&nbsp;cc.((sfn|Fusi|1978|pages=495–496)) This car was renamed '''6C 3000 PR''', for ''Passo Ridotto'' or Reduced Wheelbase, as the wheelbase was shortened by ((convert|50|cm|in|1|abbr=on)).((sfn|Fusi|1978|pages=495–496))<ref name="italiaspeed.com/2009" />[[File:2015-07-12 Impney Alfa Romeo 6C 3000PR.jpg|thumb|The 3000 PR at [[Chateau Impney]] on 12 July 2015.]]
The 6C 3000 PR was entered at the 2nd Gran Premio Supercortemaggiore held at [[Autodromo Nazionale di Monza|Monza]] in 1954, driven by Sanesi; the vehicle was written off in a crash, in which Sanesi was also injured.((sfn|Fusi|1978|pages=495–496)) It was resurrected from a museum in Brazil in the mid-1980s.<ref>[https://www.goodwood.com/grr/race/historic/2015/2/goodwood-greats-1953-alfa-romeo-6c-3000pr-disco-volante/ Goodwood Greats: 1953 Alfa Romeo 6C 3000 PR], short story from goodwood.com, 6 February 2015.</ref>
((clear))

==References==
((reflist|colwidth=35em))

==Bibliography==
((refbegin))
* ((cite book |last=Borgeson |first= Griffith |title=The Alfa Romeo Tradition |publisher=Haynes (Foulis) Publishing Group Ltd. Somerset, UK |location=City |year=1990 |isbn=0-85429-875-4))
* ((cite book |first=Luigi |last=Fusi |title=Alfa Romeo—Tutte le vetture dal 1910—All cars from 1910 |year=1978 |publisher=Emmeti Grafica editrice |location=[[Milan]] |edition=3rd ))
((refend))

==External links==
((commons category|Alfa Romeo 6C))
*[http://www.6c2500.org/ Registro Internazionale Alfa Romeo 6C 2500]
*[https://alfaromeoregister.org/en/series/6c All Alfa Romeo 6C models chronologically listed]

((Alfa Romeo))
((Alfa Romeo Pre War Timeline))
((Alfa Romeo Post War))

((DEFAULTSORT:Alfa Romeo 6c))
[[Category:Alfa Romeo vehicles|6C]]
[[Category:Alfa Romeo sports racing cars|6C]]
[[Category:Grand Prix cars]]
[[Category:1930s cars]]
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[[Category:1950s cars]]
[[Category:Cars introduced in 1925]]
[[Category:Cars introduced in 1929]]
[[Category:Cars introduced in 1933]]
[[Category:Cars introduced in 1934]]
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[[Category:Rear-wheel-drive vehicles]]
[[Category:Sedans]]
[[Category:Coupés]]
[[Category:Roadsters]]
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