Image credits: © Mazda.

1967 Mazda Cosmo Sport 110S

Introduced on May 30th, 1967, the Cosmo Sports were the world's first two rotor production vehicles. The Cosmo project began in December of 1962 with Mazda's first two rotor engine prototypes in July of 1963, and in October 1963 as the head of Mazda, Tsuneji Matsuda drove the original prototype that was dubbed 'Project L402A' to the Tokyo motor show.

The Sports utilized the prototype engine that was dubbed the L8A or 0353 with 2x398cc and used a combination of peripheral and side intake porting. Eventually the L8A engine evolved into the L10A with 2x491cc and size intake ports. The peripheral ports were finally dropped, and the engine size increased to give way for better operating characteristics. Since then, all production Mazda rotary engines use intake ports.

There were actually four generations of Mazda automobiles that went by the nomenclature of 'Cosmo', though they were not all particularly related to each other. All four generations were GT cars, and the first proved to be a successful introduction for the Mazda Wankel engine. This vehicle also acted as a ‘halo' vehicle for the new Mazda brand. Cosmos eventually competed in the ultra-high luxury performance market in Japan with the final JC Cosmo. This final model was introduced in 1990 through 1995 and was sold as the Eunos Cosmo (Eunos being a luxury sales channel that was very similar to Toyota's Lexus brand).

In April of 1966, prototype engines and vehicles progressed and a pre-production run used 80 Cosmos, 60 of which were sent out as evaluation models to Mazda dealers in Japan. This accumulated over 600,000km in 6 months. In late 1966, the design was finalized and production would begin soon after the May 30th 1967 launch date. The name L10A was shared by both the vehicle and the engine.

Though basically a conventional 1960's sports vehicle, the Mazda Cosmo came with a variety of ‘high tech' items that included front disc brakes, a de-dion rear suspension and an ‘aircraft inspired' dashboard that came with speedometer, oil pressure gauge, tachometer, ammeter and clock, and water temperature. The L10A Cosmo was only sold in Japan.

The first generation of the Mazda Cosmo Sport 110 was introduced in 1967 and had a production run until 1972. A total of 1,519 series vehicles were produced. The original Mazda that carried the Cosmo name was the 110S model, and was the original 2-rotor rotary engine powered vehicle.

At the 1964 Tokyo Motor Show, a prototype was debuted, and 80 pre-production Cosmos were produced for the Mazda test department from 1965 through 1966. Actual production began in May of 1967 and Cosmos were constructed by hand at a rate of about one per day. In the show Return of Ultraman, the Cosmo was featured.

Powered by a 0810 two-rotor engine with 982 cc of displacement, the Series I/L10A Cosmo produced around 110 hp (thus the 110 name). The 110 utilized a Hitachi 4-barrel carb and a strange ignition design with two spark plugs per chamber with dual distributors. Standard on the Mazda Cosmo Sport 110 was a 4-speed manual transmission and 14 in wheels. The front independent suspension on the Cosmo Sport was A-arm/coil spring design with an anti-roll bar. The rear of the vehicle used a live axle with a de Dion tube, trailing arms, and semi-elliptic leaf springs. In the front was power-unassisted 10 in disk brakes with 7.9 inch drum brakes in the rear. The top speed of the Cosmo Sport was 115 mph and 16.4 seconds in the quarter mile. The Cosmo was priced at $4,100, much lower than the Toyota 2000GT.

Introduced in July of 1968 was the Series II/L10B. This series featured a more-powerful 128 hp and 103 ft/lb of torque, 0813 engine, 15 inch wheels, power brakes and 5-speed manual transmission. The wheelbase was enlarged to 5.9 inches and gave the Cosmo a better ride and much more room. This newest version could achieve the quarter mile in just 15.8 seconds and had a top speed of 120 mph.

On the exterior, the new Cosmo featured a larger grille, and two additional vents were added to each side of the mouth under the front bumper. Only 1,519 models were ever built of the Cosmo Series II, and only six were ever imported to the U.S. The price jumped up a bit to $4,390.

Jay Leno owns a 1970 Series II Cosmo, and it was featured on the Speed Channel series 'My Classic Car' in March of 2006. This vehicle is believed to be the only remaining Series II Cosmo in the U.S.

In 1975, the second generation CD Cosmo debuted in 1975 and continued until 1981. This model was dubbed the Cosmo AP in Japan and was sold internationally as the Mazda RX-5. In a few export markets its piston powered counterpart was dubbed the Mazda 121. Mazda America utilized the Cosmo name and offered it from 1976 until 1978.

Unfortunately, Mazda tried too hard to ‘americanize' the CD Cosmo/RX-5 series, and it was a disaster internationally. Fortunately though, the CD/Cosmo/RX-5 was a great success in Japan and over 55,000 units where sold in the first year alone. The Series-II version from 1979 through 1981 was not exported due to poor sales as an export and remained on domestic sale only.

Mazda's ‘large' compact rotary coupe, the Cosmo was based on the Mazda RX-4 floorplan and mechanics but it was heavier because of body design and much more luxurious features. These also included a 5-link rear suspension and rear disc brakes and was available with the 12A and 13B engines.

The Cosmo 1800, a piston engine version utilized a 1769 cc straight-4 SOHC engine that produced 100 hp and produced 100 lb/ft of torque.
An engineering oddity, the Mazda Cosmo Sport 110S was a unique, piston-less engine in a strange-looking sports vehicle. The Sport 110S was a two-seat Cosmo, 60's era, with a rotary that was the brainchild of Felix Wankel, a self-taught German tinker who never made it to college.

At the time, every auto maker except Mazda gave up attempting to get the rotary to work in the real world. Eventually the rotary became reliable and a staple of Mazda production. Today the company continues to develop the rotary and is even working on alternate-fuel versions. But back then, the rotary was considered to be an automotive novelty. The Mazda Cosmo was also considered to be quite a novelty. The Xosmo was marketed in ads with 'and Mazdas go hhhmmm.' The Cosmo weighs around 2,200 lbs and nearly everything was exceedingly light and easy.

The Cosmo is considered by enthusiasts to be a uniquely styled Japanese interpretation of ‘what a Western sports car' should look like. Near the end of its production period, the Cosmo Sport 110S had a production run of around 1,200 units, and while Mazda kept a Cosmo model in production for several years, it was a ‘less interesting car'.

By Jessica Donaldson

Vehicle Profiles


The Cosmo Sport (110S) - the world's first dual-rotor rotary engine production car - was officially launched on May 30th of 1967, and helped launch Mazda's long line of rotary-powered sports and touring cars.....[continue reading]


Chassis Num: L10A-10074

Mazda had a revolutionary Felix Wankel-designed dual rotor passenger-car engine and they wanted a worthy vehicle to showcase this technology. What they came up with was the Cosmo 110 Sport. These hand built sports car helped propel Mazda to the world....[continue reading]


In 1931 Toyo Kogyo Co. Ltd., formerly the Toyo Cork Kogyo Co. debuted the Mazda DA, a 3-wheel 'motorcycle' truck but it was not until 1960 that their first car arrived, the R360. In 1961 Toyo Kogyo signed a Wankel engine license with NSU and six year....[continue reading]


Chassis Num: L10A-10260
Engine Num: 10A-1245

The world was introduced to the Mazda Cosmo at the 1964 Tokyo Motor Show and was the company's first foray into rotary-engine production vehicles, shortly after getting the license from NSU to do so. This was the first production vehicle to feature a....[continue reading]


Chassis Num: L10A-10394
Engine Num: 10A 1556

At the 1964 Tokyo Motor Show, Mazda introduced their rear-wheel-drive, two-seat Cosmo Sport coupe. This was the first production vehicle to be powered by a Wankel rotary engine. Mazda licensed the Wankel from Germany's NSU, and the Japanese company f....[continue reading]

Chassis #: L10A-10074 
Chassis #: L10A-10260 
Chassis #: L10A-10394 

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