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((Use dmy dates|date=May 2017))
((Use British English|date=May 2017))
((refimprove|date=January 2015))
((Infobox racing car
| Car_name         = Lotus 43
| Image            = [[File:FoS20162016 0624 112938AA (27785376742).jpg|260 px]]
| Category         = [[Formula One]]
| Constructor      = [[Team Lotus]]
| Designer         = [[Colin Chapman]]
| Predecessor      = [[Lotus 33]]
| Successor        = [[Lotus 49]]
| Team             = [[Team Lotus]]
| Drivers          = ((flagicon|UK)) [[Peter Arundell]] <br> ((flagicon|UK)) [[Jim Clark]] <br> ((flagicon|UK)) [[Graham Hill]]
| Technical ref = <ref name=stats>((cite web|url=http://www.statsf1.com/en/lotus-43.aspx |title=STATS F1 • Lotus 43 |publisher=Statsf1.com |access-date=2015-01-27))</ref><ref>((cite web|title=Lotus 43 BRM|url=http://www.ultimatecarpage.com/spec/272/Lotus-43-BRM.html|website=ultimatecarpage.com|access-date=27 January 2015))</ref>
| Chassis          = [[Aluminium]] [[monocoque]]
| Front suspension = top rocker arms, lower wishbones, inboard coil springs over dampers
| Rear suspension  = reverse lower wishbones, twin radius arms, coil springs over dampers, anti-roll bar
| Engine name      = '''[[BRM P75]]'''<br>((convert|2996|cc|cuin|0|abbr=on))
| Capacity         = 
| Configuration    = [[H engine|H16]]
| Turbo/NA         = [[Naturally aspirated]]
| Engine position  = 
| Gearbox name     = BRM T82
| Gears            = 6-speed
| Type             = [[Manual transmission|manual]]
| Differential     = 
| Weight           = ((convert|563|kg|lb||abbr=on))
| Fuel             = [[Esso]]
| Tyres            = [[Firestone Tire and Rubber Company|Firestone]]
| Debut            = [[1966 Belgian Grand Prix]]
| Last_event       = [[1967 South African Grand Prix]]
| Races            = 5
| Wins             = 1
| Cons_champ       = 0
| Drivers_champ    = 0
| Poles            = 0
| Fastest_laps     = 0
| Podiums = 1
))
The '''Lotus 43''' was a [[Formula One]] racing car designed by [[Colin Chapman]] for the [[1966 Formula One season|1966 season]]. Hampered by its heavy and unreliable [[BRM]] engine, it won only one race, the [[1966 United States Grand Prix]].

==Concept==
The Lotus 43 was partially based on the [[Lotus 38]] Indycar, due to Chapman's experience at Indy with larger engine capacity and tyre/suspension setup. The car was designed in this way in response to new regulations which came into force in 1966, which increased the engine capacity to 3 litres. Along with newer, wider tyres better able to handle the power of the larger engines, the need for a more robust design was obvious.<ref>((Cite web|url=https://www.historicracingnews.com/Article/The-Lotus-43-and-its-Mighty-16-Cylinders-/655|title=The Lotus 43 and its Mighty 16-Cylinders! &#124; HistoricRacingNews.com|website=www.historicracingnews.com|access-date=7 May 2020))</ref>

[[Cosworth]] were developing a new engine for Lotus, the [[Cosworth DFV|DFV]], to be introduced for the [[1967 Formula One season]], and in the meantime Chapman made a deal for use of the [[BRM P75]] [[H engine|H16]] engine. The P75 on paper was technically advanced and powerful, and Chapman had hopes that it would power his cars to another successful season.<ref>((Cite web|url=https://www.roadandtrack.com/motorsports/a21632666/lotus-43-history-jim-clark/|title=The 1966 Lotus 43 Was a Magnificent Failure With a Bizarre Engine|first=Chris|last=Perkins|date=19 June 2018|website=Road & Track|access-date=7 May 2020))</ref>

The first sign of trouble was when the H16 engine arrived at the [[Team Lotus]] factory in [[Hethel]], [[Norfolk]] and it required four men to lift it from the truck. The engine proved to be overweight, unreliable and was unable to produce the promised power.

Engine problems aside, the 43 chassis was an excellent design and elements of it were used in its 1967 successor, the far more successful [[Lotus 49]], including the use of the engine as a stressed structural member which bore weight and to which the rear suspension was attached.

==Racing history==
===1966===
The car was supposed to debut at the [[1966 Monaco Grand Prix]], driven by [[Peter Arundell]], but it was unavailable. Its first outing at the following [[1966 Belgian Grand Prix|Belgian Grand Prix]] ended during practice, when the engine gave out.<ref name=stats/>

The 43 reappeared at the [[1966 Italian Grand Prix|Italian Grand Prix]] but retired with gearbox failure. Clark then won the [[1966 United States Grand Prix|United States Grand Prix]] at [[Watkins Glen International|Watkins Glen]], the only race win for the P75 engine, using a spare engine loaned by the [[BRM]] team. However, gearbox failure again led to the 43's retirement from the final race of the season, the [[1966 Mexican Grand Prix|Mexican Grand Prix]].

===1967===
In 1967 the 43 made its final appearance at the [[1967 South African Grand Prix|South African Grand Prix]] at the [[Kyalami]] circuit, where Clark and new team mate [[Graham Hill]] both retired their cars.

Only two cars were built and were later sold to [[Robert Lamplough]] and [[Jock Russell]], who fitted them with 4.7 litre Ford V8 engines and competed in [[Formula 5000]] events.

<gallery widths="175px" heights="140px">
Lotus 43 2014.jpg|Lotus 43 at the BTCC Knockhill 2014
File:Lotus 43 2014 2.jpg|Lotus 43 being demonstrated in 2014
</gallery>

==Complete results==

===Formula One World Championship results===
([[:Template:F1 driver results legend 2|key]])
{| class="wikitable" style="text-align:center; font-size:95%"
! Year
! Entrant
! Engine
! Tyres
! Drivers
! 1
! 2
! 3
! 4
! 5
! 6
! 7
! 8
! 9
! 10
! 11
! Points
! WCC
|-
| rowspan=3 | ((F1|1966))
| rowspan=3 | [[Team Lotus]]
| rowspan=3 | [[BRM P75]] 3.0 [[H engine|H16]]
| rowspan=3 | ((Firestone))
|
| [[1966 Monaco Grand Prix|MON]]
| [[1966 Belgian Grand Prix|BEL]]
| [[1966 French Grand Prix|FRA]]
| [[1966 British Grand Prix|GBR]]
| [[1966 Dutch Grand Prix|NED]]
| [[1966 German Grand Prix|GER]]
| [[1966 Italian Grand Prix|ITA]]
| [[1966 United States Grand Prix|USA]]
| [[1966 Mexican Grand Prix|MEX]]
|
|
| rowspan=3 |'''13'''((smallsup|1))
| rowspan=3 |'''5th'''
|-
| [[Peter Arundell]]
| 
| style="background:#FFFFFF;"| DNS
| style="background:#EFCFFF;"| Ret
| 
| 
| 
| 
| 
| 
| 
| 
|-
| [[Jim Clark]]
| 
| 
| 
| 
| 
| 
| style="background:#EFCFFF;"| Ret
| style="background:#FFFFBF;"| 1
| style="background:#EFCFFF;"| Ret
| 
| 
|-
| rowspan=3 | ((F1|1967))
| rowspan=3 | [[Team Lotus]]
| rowspan=3 | [[BRM P75]] 3.0 [[H engine|H16]]
| rowspan=3 | ((Firestone))
|
| [[1967 South African Grand Prix|RSA]]
| [[1967 Monaco Grand Prix|MON]]
| [[1967 Dutch Grand Prix|NED]]
| [[1967 Belgian Grand Prix|BEL]]
| [[1967 French Grand Prix|FRA]]
| [[1967 British Grand Prix|GBR]]
| [[1967 German Grand Prix|GER]]
| [[1967 Canadian Grand Prix|CAN]]
| [[1967 Italian Grand Prix|ITA]]
| [[1967 United States Grand Prix|USA]]
| [[1967 Mexican Grand Prix|MEX]]
| rowspan=3 |'''6'''((ref|A|2))
| rowspan=3 |'''8th'''
|-
| [[Jim Clark]]
| style="background:#EFCFFF;"| Ret
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
|-
| [[Graham Hill]]
| style="background:#EFCFFF;"| Ret
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
|-
|}
((note|A|1)) Total points scored by all Lotus-BRM cars, including 4 points scored by drivers of [[Lotus 33]] variants. <br> ((note|A|2)) Total points scored by all Lotus-BRM cars, including 6 points scored by drivers of [[Lotus 33]] variants.

===Non-championship Formula One results===
([[:Template:F1 driver results legend 3|key]])
{| class="wikitable" style="text-align:center; font-size:95%"
|-
! Year
! Entrant
! Engine
! Tyres
! Drivers
! 1
! 2
! 3
! 4
|-
| rowspan=2 | [[1966 Formula One season|1966]]
| rowspan=2 | [[Team Lotus]]
| rowspan=2 | [[BRM P75]] 3.0 [[H engine|H16]]
| rowspan=2 | ((Firestone))
|
| [[1966 South African Grand Prix|RSA]]
| [[1966 Syracuse Grand Prix|SYR]]
| [[1966 BRDC International Trophy|INT]]
| [[1966 International Gold Cup|OUL]]
|-
| [[Jim Clark]]
| 
| 
| 
| style="background:#FFFFFF;"| DNS
|-
|}

==PC simulation==
A driveable, detailed reconstruction of the Lotus 43 (with matching car physics) appeared in 2007 in the freely-available '66 Mod' for the PC-based racing simulation ''[[Grand Prix Legends]]''.

==References==
((reflist))

((Team Lotus))
((Lotus))
((F1 cars 1966))
((F1 cars 1967))

[[Category:Lotus Formula One cars|43]]

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