Mazda R100 [Technical Sheet]

Mazda R100 Logo

The Mazda R100 was the export name for the Mazda Familia Rotary Coupe, an automobile produced by Mazda in Japan from 1968 to 1973. It used the chassis from the Familia and the rotary 0820 engine similar to the one used in the Cosmo Sport Series II. It was a 2 door 2+2 coupé and was produced from 1968 to 1973. It was also known as the Familia Presto Rotary and was quite ordinary except for its powerplant. Power was rated at just 100 hp (70 kW) due to a small carburetor (thus the “R100” name).

R100

The R100 was one of the first cars imported into the United States for the new Mazda Motors of America, sold in model years 1971 and 1972. It was a surprising hit with the American public, though sales were limited to some Northwestern states initially.

mazda r100 rotary familia coupe wankel engine

Following on the success of the Cosmo Sports at Nürburgring in 1968, Mazda decided to race another rotary car. The Familia Rotary Coupé won its first outing, at the Grand Prix of Singapore, in April, 1969.

Next, the company took on the touring car endurance challenge at Spa, the Spa 24 Hours. For 1969, Mazda entered a pair of Familia Rotary Coupés. The cars came fifth and sixth the first year after a quartet of Porsche 911s. The Familia also placed fifth at the Marathon de la Route at Nürburgring in 1969, the same race that the Cosmo had bowed at the previous year. Finally, Mazda took the Familia home for the Suzuka All-Japan Grand Cup, where it won easily.

mazda r100 rotary familia coupe rotary engine wankel motor

For 1970, the Familia placed eighth at the RAC Tourist Trophy in June, followed by a fourth place at the West German Touring Car race in July. At Spa, four Familias were present, battling with BMW Alpinas, and Alfa Romeos for the podium. This time, three of the Mazdas retired, with the fourth claiming the fifth position.

Mazda also turned its attention to Le Mans in 1970 with rotary-powered prototypes. The company would finally win that race 21 years later with the 787B.

mazda r100 rotary familia coupe wankel enginemazda r100 rotary familia coupe wankel engine

Mazda R100 Coupé
Produced: 1968–1973
Engine: Two-rotor rotary engine (Wankel-licensed), aluminium rotor chambers, cast iron center and end plates
Bore x Stroke: Does not apply
Displacement: 984 cc
Max. Power @ rpm: 100 hp (75 kW) @ 7000 (SAE gross)
Max. Torque @ rpm: 125 N·m (92 lb·ft) @ 4000 (SAE gross)
Compression Ratio: 9.4: 1
Fuel feed: single Hitachi 4bbl-carburetor
Fuel tank capacity: 50 L (13.2 US gal; 11.0 imp gal)
Valvetrain: Does not apply
Cooling: Water
Gearbox: Fully synchronized 4-speed-manual with floor mounted lever control & rear wheel drive
Electrical system: 12 volt
Front suspension: MacPherson struts, coil springs, anti-roll bar
Rear suspension: Solid axle, semi-elliptical leaf springs
Brakes: Front discs (9.6 in), rear drums (7.9 x 13 in)
Steering: Recirculating ball steering
Body structure: Sheet steel, monocoque (unibody) construction
Dry weight: 913 kg (2,013 lb)
Track front/
rear:
1,200 mm (47 in) 1,190 mm (47 in)
Wheelbase: 2,260 mm (89 in)
Length: 3,830 mm (151 in)
Width: 1,480 mm (58 in)
Height: 1,345 mm (53.0 in)
Tyre/Tire sizes: 14 x 4.0“
Top speed (estimate): 177 km/h (110 mph)
0-60 mph (measured): 10.8 sec
Fuel Consumption (measured): 9.8 litres per 100 kilometres (29 mpg-imp; 24 mpg-US) − 14.7 litres per 100 kilometres (19.2 mpg-imp; 16.0 mpg-US)
Price (USA, MY 1971): $ 2.495

mazda r100 rotary familia coupe wankel engine

mazda r100 rotary familia coupe wankel engine

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