Mazda Cosmo
1968 Mazda Cosmo L10B
AssemblyJapan: Hiroshima (Hiroshima Assembly)
Body and chassis
ClassSports car (1967–1981)
Mid-size car (1981–1989)
Grand tourer (1990–1996)
LayoutFront-engine, rear-wheel-drive

The Mazda Cosmo (マツダ・コスモ, Matsuda Kosumo) is an automobile which was produced by Mazda from 1967 until 1996. Throughout its history, the Cosmo served as a "halo" vehicle for Mazda, with the first Cosmo successfully launching the Mazda Wankel engine. The final generation of Cosmo served as Mazda's flagship vehicle in Japan, being sold as the Eunos Cosmo through its luxury Eunos division in Japan.

Mazda chose to use the name "cosmo", reflecting international cultural fascination with the Space Race, as Mazda wanted to showcase the rotary engine as forward-thinking, with a focus on future developments and technology.

Series L10A/L10B (1967–1972)

Series L10A/L10B
1967 Mazda Cosmo L10A (Series I)
Body and chassis
Body style2-door coupé
  • 982 cc 0810 (Series I)
  • 982 cc 0813 (Series II)
WheelbaseSeries I: 2,200 mm (86.6 in)
Series II: 2,350 mm (92.5 in)
Length4,140 mm (163.0 in)
Width1,595 mm (62.8 in)
Height1,165 mm (45.9 in)
Curb weight940 kg (2,072.3 lb)

The first Mazda to bear the Cosmo name (called the 110S on models intended for export) was (along with the NSU Ro80) one of the first production cars to feature a 2-rotor Wankel engine. A prototype was presented at the 1964 Tokyo Motor Show, one month before the 1964 Summer Olympics, and after the introduction of the NSU Spider at the Frankfurt Motor Show; 80 pre-production Cosmos were produced for the Mazda test department (20) and for dealership testing (60) between 1965 and 1966. Full production began in May 1967 and lasted through 1972, though Cosmos were built by hand at a rate of only about one per day, for a total of 1,176 (343 Series I cars and 833 Series II cars).[1][2] The car was also featured in the show The Return of Ultraman.[3]

Cosmos were built in five batches:

Date Number Engine Description
1963 2 8A prototype Cosmo
1964 1 10A Tokyo Motor Show prototype
January 1965 80 0810 preproduction test cars
May 1967 – July 1968 343 0810 Series I
July 1968 – September 1972 833 0813 Series II


In 1968, Mazda went racing with the Cosmo. They selected one of the most grueling tests in Europe to prove the reliability of the rotary engine, the 84-hour Marathon de la Route at the legendary Nürburgring circuit in Germany.[2] Two mostly stock Cosmos were entered, along with 58 other cars. One major change to the cars' 10A engines was the addition of a novel side- and peripheral-port intake system: A butterfly valve switched from the side to the peripheral port as RPMs increased. The engines were limited to 130 PS (96 kW) to improve durability.

The cars ran together in fourth and fifth place for most of the race, but the all-Japanese car was retired with axle damage in the 82nd hour. The other car, driven by Belgians, completed the race in fourth overall.[2] This was to be the only racing outing for the Cosmo—the next Mazda race car would be a Familia Rotary (R100).

Series I

1967 Mazda Cosmo L10A (Series I) rear view

The Series I/L10A Cosmo was powered by a 0810 two-rotor engine with 982 cc of displacement and produced about 110 hp (thus the 110S name used in export markets). It used a Hitachi four-barrel carburetor and an odd ignition design—two spark plugs per chamber with dual distributors. A four-speed manual transmission and 14-inch wheels were standard.

In Japan, the installation of a rotary engine gave Japanese buyers a financial advantage when it came time to pay the annual road tax in that they bought a car that was more powerful than a traditional inline engine, but without having the penalty for having an engine in the higher above-one-litre tax bracket.

The front suspension was a coil-sprung double-wishbone design with an anti-roll bar. The rear used a leaf-sprung de Dion tube. Unassisted 10 inch (254 mm) disk brakes were found in front with 7.9 inches (201 mm) drum brakes in the rear. Performance in the quarter-mile (400 m) was 16.4 s, with a 115 mph (185 km/h) top speed. The price was lower than the Toyota 2000GT at 1.48 million yen (US$4,100).

Series II

Series II L10B interior

The Series II/L10B was introduced in July 1968. It had a more-powerful 128 hp (95 kW)/103 lb·ft (140 N·m) 0813 engine, power brakes, 15 inch wheels and a 5-speed manual transmission. The wheelbase had been expanded by 15cm for more room and a better ride. This Cosmo was good for over 120 mph (193 km/h) and could accelerate to cover a quarter-mile (400 m) in 15.8 s.

Visual changes included a larger grille under the front bumper with two additional vents to each side of this "mouth". Only 833 were ever made, and fewer than six Series II models were initially imported into the United States. The price was up a bit to 1.48 million yen (US$4,390).

Comedian and former talk show host Jay Leno owns a 1970 Series II Cosmo which was featured on the North American Speed Channel series My Classic Car in March 2006. It was believed to be the only remaining Series II Cosmo in the United States, though the original Cosmo 10A engine has been replaced with a 12A from an RX-7.

However, Mazda's U.S. division "found another in the garage of Phoenix-area car collector Glenn Roberts and made an offer that he couldn't refuse," according to Car and Driver magazine's September 2007 issue ("A Tale of Two Rotaries"). There is a further Series II Cosmo in a collection in Alberta, Canada.

A 1970 Mazda Cosmo Sport Series II L10B Coupe sold in January 2015 for US$110,000 inclusive premium at auction at Bonhams.[4]

Series CD (1975–1981)

Series CD
Mazda Cosmo AP fastback
Also called
  • Mazda RX-5
  • Mazda 121
Body and chassis
Body style
RelatedMazda Luce
  • 1769 cc VC SOHC I4 (CD2V)
  • 1970 cc MA SOHC I4 (CD3M)
  • 1146 cc 12A 2-rotor (CD22)
  • 1308 cc 13B 2-rotor (CD23)
Wheelbase2,510 mm (98.8 in)
Length4,475–4,545 mm (176.2–178.9 in)
Width1,685 mm (66.3 in)
Height1,325 mm (52.2 in)
Curb weight2,469 lb (1,120 kg)
SuccessorMazda 121 (DA)
Mazda 121 L Landau coupé

The second generation CD Cosmo appeared in 1975 and lasted until 1981. It was known as the Cosmo AP (Anti-Pollution) in Japan, and sold internationally as the Mazda RX-5, though in some export markets its piston-powered counterpart was called the Mazda 121 (a name later applied to Mazda's subcompact model).

Mazda Cosmo AP fastback rear view
Mazda 121 fastback

Mazda America used the Mazda Cosmo name and offered it from 1976 through 1978, after which the Cosmo was replaced by the Mazda RX-7 as their rotary-powered sports coupe. The CD Cosmo/RX-5 series was positioned as a personal luxury car, offered as a notchback coupe, called the Landau, which included an "opera window" and padded vinyl roof covering, that appeared to be influenced by the 1970s era Lincoln Continental. It was also available as a fastback, but neither body style found many international buyers. It was however an enormous success in Japan where over 55,000 were sold in the first year alone. This new body style competed with the Toyota Crown, Nissan Cedric, Nissan Gloria, and the Mitsubishi Galant Lambda coupes newly introduced to Japan.

Due to its poor sales as an export, the Series II version, built from 1979, was not exported and remained a Japanese domestic sale only. RX-4 exported to Europe saw very little competition in the rotary-engine equipped market, with the introduction of the short-lived Citroën GS Birotor, as well as any remaining NSU RO80 sedans.

The Cosmo was Mazda's largest rotary-powered coupe, based on the LA series Mazda Luce floor pan and mechanics, but slightly heavier due to body design and more luxurious appointments, including a five-link rear suspension and rear disc brakes. It was available with the 12A and 13B engines. This series Cosmo was joined by the short-lived Mazda Roadpacer, a large, heavy sedan powered only by a rotary engine.

A piston engine version, the Cosmo 1800, used a 1769 cc (80 x 88 mm) inline-four SOHC engine that produces 100 PS (73.5 kW) and 110 lb⋅ft (149 N⋅m). There was also the bigger Cosmo 2000 with 110 PS (81 kW).

The rotary engine had financial advantages to Japanese consumers in that the engine displacement remained below 1.5 liters, a significant determination when paying the Japanese annual road tax which kept the obligation affordable to most buyers, while having more power than the traditional inline engines.

Series HB (1981–1987)

Series HB
Also calledMazda 929 (1982–1986)
Body and chassis
Body style
RelatedMazda Luce
Wheelbase2,615 mm (103 in)
Length4,640 mm (183 in)
Width1,690 mm (67 in)
Height1,340 mm (53 in)
Curb weight1,135 kg (2,502 lb)
First series Cosmo Limited Rotary Turbo two-door coupe. Notice the divided rear side windows and the vertical indents on the tail lamps
Cosmo two-door Coupé interior
1984 Mazda Cosmo Rotary Turbo Limited Hardtop
1984 Mazda 929 Coupé

The third generation HB Cosmo from 1981 shared the Mazda HB chassis with its twin, the Mazda Luce. Some versions of both HB cars were sold overseas as the Mazda 929. The HB Cosmo was offered as a coupé (also called two door hardtop), as a sleek frameless window sedan (also called four door hardtop), and as a formal pillared sedan (known in Japan as saloon). The HB Cosmo was the only car in automotive history to offer a choice of both Gasoline and Diesel piston engines and Rotary engines, and this was the last generation Cosmo to be exported.

Both the Cosmo sedan and four door hardtops were badge engineered versions of their respective Luce counterparts, with the Cosmo models sold at an exclusive dealership called Mazda Auto, while the Luce was sold at previously established Japanese Mazda dealerships. Later in 1991, Mazda Auto locations were renamed Eunos. The two door HB coupé however was only sold in Japan as a Cosmo.

When the FC series Mazda Savanna RX-7 was introduced in 1986 internationally, this series Cosmo coupe retained its top position as Mazda's largest rotary powered personal luxury car, with a comfortable backseat, trunk, and every luxury amenity available, while adopting the retractable headlights from the RX-7.

Mazda offered three different rotary engines for the HB series. A 12A-6PI (for "six-port induction"), 12A-turbo and 13B-RESI, with all using electronic multiport fuel injection. The latter available with automatic transmission only. The 1982 12A-turbo Cosmo coupé was officially the fastest production car in Japan until being overtaken by the FJ20ET powered R30 Skyline RS.

The rotary engine had financial advantages to Japanese consumers in that the engine displacement remained below 1.5 litres, a significant determination when paying the Japanese annual road tax which kept the obligation affordable to most buyers, while having more power than the traditional inline engines.

The HB Cosmo & Luce names were used in Japan, with the 929 being the export version (which was not available with the rotary engine options). While the HB Luce and Cosmo Saloon were discontinued in 1986, both Cosmo hardtops remained in production at a trickle until 1989.

The Mazda 929 Turbo EGI (Electronic Gasoline Injection) Luxury was available in Australia from 1986 to May 1987 (with these later cars produced in 1986). It used the FET engine and came only with a manual transmission. Not all two-door 929 models used the FET, most used other variants of the FE engine, either Carburetor or EGI with optional four-speed automatic transmission. The 2.0 L (1998 cc) fuel injected, turbocharged FET version of the FE produced 135 hp (100 kW) and 175 lb·ft (237 N·m). It was a water cooled 8-valve SOHC engine featuring a small turbocharger, and no intercooler.

Series I Models for Japan (1981-1983)

First Series Mazda Cosmo 2000 XG-X EGI Hardtop. All first series HB Hardtop and Coupé Cosmos had pop-up headlamps.

Coupé and Hardtop:

First series Mazda Cosmo Saloon (Sold as Mazda 929 Saloon overseas) showing narrow headlamps.


Series II Models for Japan (1984-1989)

Rear of a second series Mazda 929 Coupé showing the now un-divided rear side windows and the tail lights with horizontal indents.

Coupé and Hardtop:

Second series Mazda 929 Saloon showing the re-styled front end with wider headlamps.

Saloon (1984-1986):

Series JC (Eunos Cosmo, 1990–1996)

Series JC
Body and chassis
Body style2-door coupé
Transmission4-speed automatic
Wheelbase2,750 mm (108 in)
Length4,815 mm (190 in)
Width1,795 mm (71 in)
Height1,305 mm (51 in)
Curb weight1,490–1,640 kg (3,285–3,616 lb)

The Eunos Cosmo (loosely based on the 1985 MX-03 concept car) started production in 1990 on the new JC platform. The Eunos Cosmo was the top-line touring flagship of the Eunos luxury channel. It is the only Mazda to use a triple-rotor engine. The car was a 2+2 coupé and was loaded with power amenities. Following the Japanese luxury theme, only an electronically controlled 4-speed automatic transmission was available that could be placed in manual shift mode and would change the gear selection in the dashboard display from PRNDSL for automatic transmission operation and PRND321 for manual transmission use.[5]

Mazda 20B-REW three rotor engine

In Japan, its sole market, sales were affected by the fact that this series Cosmo no longer complied with Japanese government dimension regulations, and Japanese buyers were liable for yearly taxes for driving a larger car compared to previous generations. Compounding matters further was the Japanese asset price bubble burst.

Two engines were available, and both were installed with twin sequential turbochargers; the two rotor 13B-RE and the three rotor 20B-REW. The triple rotor 20B had 2 litres (1962 cc) of displacement, making it the largest capacity rotary offered for sale by Mazda. It produced 280 PS (206 kW; 276 hp) and 403 N⋅m (297 lb⋅ft) of torque with twin turbochargers sourced from Hitachi.[5] Two trim packages were offered; the S (Sport) which offered a firm suspension consisting of control arms in the front and a multilink rear suspension, with a cloth inserts added to leather interior and a full length center console accommodating four passengers, or E (Elegant) which offered a softer-tuned suspension and full leather upholstery.[5]

The JC series Cosmo set several firsts in automotive history. Its two rotor 13B-RE and three rotor 20B-REW engines were the first Japanese built, series production twin sequential turbo systems to be offered for sale on a rotary engine car. The internationally known FD series RX-7 didn't receive the twin turbo 13B-REW engine until early 1992. The Eunos Cosmo was the first production car to have a built-in GPS navigation system,[6] and the first in Japan to use the "Palmnet" serial data communication system for ECU-to-ECAT operation.

The fourth generation Cosmo was ahead of its time electronically as well by being offered[7] with Car Communication System, a CRT colour touch-screen controlling climate control, mobile phone, GPS car navigation, NTSC TV, radio and CD player.[8] The instrumentation used a LCD display rendering analog gauges with indicator needles that "floated" and vivid colors for various functions.[5]

Cosmo "Sport" cloth interior

The Cosmo was speed limited to 180 km/h (111.8 mph) to suit Japanese regulations, but the 20B-REW version was capable of 255 km/h (158.4 mph) if given a free run.[9] With over 380 N⋅m (280 lb⋅ft) of torque available at just 1,800 rpm, the Cosmo could launch from standstill to freeway speeds quickly; however, this came at the expense of heavy fuel consumption. The JC Cosmo was expensive even by today's standards, as Mazda still has not matched the sales price of this car some 22 years later for anything else in its range. The availability of power and speed in the Cosmo appears extravagant in its intended market of Japan once it becomes understood that most of the driving environment consists of two-way streets that are usually zoned at 40 km/h (25 mph) or less,[10] as mentioned in the article Speed limits in Japan

The Cosmo was manufactured from February 1990 until September 1995, and gathered a total of 8,875 sales. A split of 60/40 sales between 13B-REW and 20B-REW variants made the triple rotor 20B-REW version a rarer car. Although the Cosmo remained a Japanese market-only vehicle (export had been proposed originally under the Eunos sales channel, and under the stillborn Amati brand in the USA),[9] used Cosmos have found their way to various RHD countries thanks to import regulations for private importers from these countries. The Cosmo appears in Sega GT and in the Gran Turismo and Gran Turismo 2 games, as well as the arcade game series Wangan Midnight: Maximum Tune 1 through 6RR.


Cosmo 21 Concept (2002)

Cosmo 21
Model years2002
Body and chassis
Body style2-door coupé
RelatedMazda MX-5 (NB)
Engine1.3 L RENESIS twin-rotor
Power output250 PS

At the 2002 Tokyo Auto Salon, Mazda presented the Cosmo 21, a retro styled 21st century reinterpretation of the original Cosmo 110s of 1967 to commemorate the 35th anniversary of the Cosmo.

Based on Mazda's current generation of MX-5 (NB), the concept was styled and constructed by Mazda subsidiaries M'z IF (styling) and Mazda Sangyo (construction), and closely resembled the original Cosmo. The engine of the MX-5 was replaced by an early version of the Renesis rotary engine, later found in the Mazda RX-8.[11]

The Cosmo 21 was revealed around the same time as many other retro style cars, including the Volkswagen New Beetle and the New Mini, adding to the growing list of retro style cars being produced in this era. Rumours of the Cosmo 21 entering limited production circulated in Japan, but the car remained purely a concept.[12]



  1. ^ Long, Brian (2004). RX-7. Dorchester: Veloce Publishing. p. 12. ISBN 1-904788-03-3.
  2. ^ a b c Sherman, Don (February 2008). "The Rotary Club". Automobile Magazine. pp. 76–79.
  3. ^ Reichert, Günter. "Cosmo Sport – erstes Auto mit einem Zweischeiben Wankelmotor" [Cosmo Sport: the first car with a two-rotor engine]. (in German). Retrieved 19 July 2017.
  4. ^ "1970 Mazda Cosmo Sport Series II L10B Coupe". 15 January 2015. Retrieved 19 July 2017.
  5. ^ a b c d Brinker, Mark R.; Vernis, Myron T. (2022). Japan's Most Astonishing Automobiles For the Collector and Enthusiast (Volume 2 ed.). Quiet Greatness, LLC. ISBN 978-0-578-34683-0.
  6. ^ "1993 Eunos/Mazda Cosmo Classic Drive Uncosmopolitan: Meet the rarest Mazda in America". Motor Trend. TEN: The Enthusiast Network. February 2012. Retrieved 18 January 2015.
  7. ^ "D M R H Special vehicles (JC Cosmo)". Retrieved 27 June 2010.
  8. ^ Best MOTORing official ベストモータリング公式チャンネル (22 December 2009). "Mazda promotional video for Eunos Cosmo". YouTube (in Japanese). CarbonShaman. Archived from the original on 22 December 2021. Retrieved 19 July 2017.
  9. ^ a b "(Wheels Magazine)". D M R H. Retrieved 27 June 2010.
  10. ^ "Driving in Japan". Retrieved 22 February 2017.
  11. ^ "Mazda Cosmo 21". Roadster Blog. 10 April 2017. Retrieved 2 October 2023.
  12. ^ Yuan, Dave (4 April 2014). "FAUX-STALGIC: The MX-5-based Mazda Cosmo 21". Japanese Nostalgic Car. Retrieved 7 December 2023.