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Mazda OHV engine
From Wikipedia, the free encyclopedia
After an early flirtation with V-twin engines, Mazda's small cars of the 1960s were powered by OHV straight-4 engines. This family lasted from 1961 until the mid-1970s. Today, Mazda's keicars use Suzuki engines.
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The 358 cc water-cooled OHV straight-4, used in the 1961 P360 Carol had a tiny 46 mm bore and 54 mm stroke. This was one of the smallest production 4-cylinder automobile engine in history, only beaten by Honda's 356 cc DOHC alloy V4 unit used in the T360 truck. The engine's small size was dictated by Japan's keicar rules which offered special status to vehicles with engines displacing less than 360 cc. Mazda's tiny OHV was the only four-cylinder in the class in the 1960s, but was outperformed by 2-stroke and I3 powerplants from other companies. Mazda also developed a prototype Wankel engine under the limit, but its introduction was blocked by the company's larger competitors. The size limit was raised to 550 cc in 1976, and no other company saw fit to build such a small engine again.
The 586 cc engine was a larger version of the 358 cc engine. It was used in the 1962 P600 Carol and produced 28 hp.
A larger 782 cc engine powered the 1964 Mazda Familia and 1966 Mazda Bongo. Bore was 58 mm and stroke was 74 mm for this water-cooled SOHC engine.
The 987 cc engine used a square 68 mm bore and stroke. It was a water-cooled SOHC engine and powered the 1967 Mazda Familia coupe.
One of the more-popular variants of this family was the 1.2 L (1169 cc) unit found in the Familia/1200. Bore was 70 mm and stroke was 76 mm. The 1200 used a Hitachi/Stromberg carburetor and 8.6:1 compression to produce 64 hp at 6000 rpm and 67 ft.lbf at 3500 rpm.