Makes › Mazda › Cosmo Sport (110S) · Rare production · 1967–1972 Rare
Mazda
Cosmo Sport (110S)
First Mazda twin-rotor production car
Photo: Calreyn88 · CC BY-SA 4.0
Contents
01Overview
At a glance
- Built
- 1,500 Built
- Years
- 1967–1972
- Engine
- front, twin-rotor Wankel rotary · 491 cc / 0.5 LFactory: 491 cc
- Power
- 80.9 kW / 110 PSFactory: 110 PS
- Top speed
- 185 km/hFactory: 185 km/h
- Body
- Not yet verified
- Designer
- Mazda in-house designers (Japanese)
- In this archive
- Not yet verified
- Surviving
- Not yet verified
Sources and any conflicting figures are in the sections below.
Why it matters
Mazda describes the Cosmo Sport, sold abroad as the 110S, as the first volume-production sports car with a two-rotor rotary engine. It showed that the Wankel engine, which other makers were abandoning, could be made reliable through Mazda's carbon-based apex seals.
How rare is it?
Six separate kinds of rarity – never combined into one number.
Each kind of rarity is rated separately and never combined.
Photos
Exterior, interior and detail photos with their licences.
Mazda Cosmo Sport (110S) (Wikimedia Commons: Mazda Cosmo (L10))
Photo: Calreyn88 · CC BY-SA 4.0
Mazda Cosmo Sport (110S) (Wikimedia Commons: Mazda Cosmo (L10))
Photo: Calreyn88 · CC BY-SA 4.0
Mazda Cosmo Sport (110S) (Wikimedia Commons: Mazda Cosmo (L10))
Photo: Charles from Port Chester, New York · CC0 1.0
Mazda Cosmo Sport (110S) (Wikimedia Commons: Mazda Cosmo (L10))
Photo: Charles from Port Chester, New York · CC0 1.0
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02Production & history
Production
Every figure says what it counts.
| What is counted | Figure | Basis | Status |
|---|---|---|---|
| Total model productionexamples built by 1972 | 1,5001,2 | Factory production | Registry reported |
Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.
History
The Cosmo Sport was shown as a prototype at the 1963 Tokyo Motor Show and formally announced there in 1964. Rotary development began in 1961 and the main problem was chatter marks inside the rotor housing, which Mazda engineers solved with new seals. Production started in 1967 and the car was built by hand, usually no more than one per day.
From 1968 a slightly longer wheelbase was used and the engine was retuned to 128 hp. Cosmos competed in long-distance races such as the 82-hour Marathon de la Route at the Nurburgring. Production ran to 1972, by which time 1,500 had been built. Mazda North America's heritage car is one of only two 110S exported directly to the United States in period.
Variants
How each version differs from the standard Cosmo Sport (110S).
No variants documented yet. Have a source? Contribute it.
03Specifications
Technical specifications
Engine
| Engine family | Not yet verified |
|---|---|
| Engine code | Not yet verified |
| Layout | front, twin-rotor Wankel rotary3 |
| Displacement | 491 cc / 0.5 LFactory: 491 cc3491 cc is the swept volume of each of the two rotor chambers; Revs says the engine displaced less than one litre. |
| Bore | Not yet verified |
| Stroke | Not yet verified |
| Compression ratio | Not yet verified |
| Fuel system | Not yet verified |
| Power | 80.9 kW / 110 PSFactory: 110 PS3Revs gives 110 hp at 7,000 rpm and 128 hp from 1968. |
| Power at | 7,000 rpm1 Independently researched |
| Torque | Not yet verified |
Transmission & drivetrain
| Gearbox | 4-speed manual4 Independently researched |
|---|---|
| Gears | 44 Independently researched |
| Driven wheels | Not yet verified |
Chassis, body & dimensions
| Chassis | Not yet verified |
|---|---|
| Front suspension | double wishbone1 Independently researched |
| Rear suspension | De Dion axle1 Independently researched |
| Brakes | front discs, rear drums4 Independently researched |
| Steering | Not yet verified |
| Body construction | Not yet verified |
| Wheelbase | Not yet verified |
| Length | Not yet verified |
| Width | Not yet verified |
| Height | Not yet verified |
| Front track | Not yet verified |
| Rear track | Not yet verified |
| Kerb weight | 930 kgFactory: 930 kg4 Independently researchedRevs gives 2,050 lb curb weight. |
| Dry weight | Not yet verified |
Performance
| Maximum speed | 185 km/hFactory: 185 km/h3 |
|---|---|
| 0–100 km/h | Not yet verified |
| Standing ¼ mile | 16.3 s3 |
| Fuel tank | Not yet verified |
“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.
04Colours & options
Factory colours & interiors
Original paint and trim, with the number of cars in each where a source gives it.
Not yet documented. Have a source? Contribute it.
Factory options & codes
Codes are shown exactly as written by the manufacturer.
Not yet documented. Have a source? Contribute it.
05Individual cars
Chassis register
Every documented car, with its colours, history and where it is now. Open a row for the full record. Known chassis are not automatically authenticated originals.
Not yet documented. Have a source? Contribute it.
Competition history
Every race result of the individual cars, in date order. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
Auction & sale history
Documented public sales of the individual cars. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
See one in person
Museums where an example of this car can be seen.
No example is documented on public display yet. Have a source? Contribute it.
06Reference
Identification guide
How to tell an original from a replica or later conversion.
The Series I (1967-1968) has the 110 hp engine; later cars have a longer wheelbase and the 128 hp tune. The twin-rotor engine has two spark plugs per rotor chamber and two ignition coils and distributors. Series I examples had front disc brakes with rear drums and a de Dion rear axle; conceptcarz gives the Series I run as 343 cars. Export cars carry the 110S designation.
Sources
Each number links to the exact facts it supports.
-
1
Cosmo Sport / 110S - Mazda's first go at a rotary-engine car Level B Revs Institute
- Production of the Cosmo / 110S ran through to 1972, by which time 1,500 examples
- the engine could safely rev to 7,000 rpm. At that point, it produced 110 hp
- double-wishbone front suspension and a DeDion rear axle
- 2
-
3
Cosmo Sport (1967-) Level A Mazda Motor Corporation
- rotary engine with 491cc x 2 capacity
- maximum power of 110ps
- top speed of 185 km/h
- a quarter-mile (400m) time of 16.3 seconds
-
4
1967 Mazda Cosmo Sport 110S Coupe Level B conceptcarz.com
- 110-horsepower rotary engine mated to a 4-speed manual transmission
- 4-speed manual transmission
- disc brakes ... drums were mounted at the rear
- The two-seater coupe weighed just 930 kilograms
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