Mazda OHV engine

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. It was produced at the Hiroshima Plant in Hiroshima, Japan.

DA/DB

The 358 cc water-cooled OHV straight-4 DA engine, used in the 1962 P360 Carol had a tiny 46 mm (1.8 in) bore and 54 mm (2.1 in) stroke. This was one of the smallest production four-cylinder automobile engines in history, only beaten by Honda's 356 cc I4 unit used in the T360 truck. The engine's small size was dictated by Japan's kei car 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.

When fitted to the B360/Porter light truck and van, the engine received the DB engine code.[1]

RA

The 586 cc RA engine was a larger version of the 358 cc engine (54.0 x 64.0 mm). It was used in the 1962-1964 P600 Carol and produced 28 hp (21 kW).

SA

The SA, a larger 782 cc engine powered the 1963-1967 Mazda Familia and the 1966 Mazda Bongo. Bore was 58 mm (2.3 in) and stroke was 74 mm (2.9 in) for this water-cooled OHV engine. In the Familia, the SA produces 42 PS (31 kW) at 6,000 rpm, while the Bongo received a detuned version with 37 PS (27 kW) at 5,000 rpm.[2] For 1966 and 1967, the max power of the SA mounted in the Familia increased to 45 PS (33 kW) (at the same engine speed), by increasing the compression ratio from 8.5:1 to 9.0:1.[3]

PB

The 987 cc PB engine, a separate development, used a square 68 mm (2.7 in) bore and stroke. It was a water-cooled OHV engine and first powered the 1967 Mazda Familia 1000. Output ranged from 52 to 58 PS (38 to 43 kW), depending on the application.

TB

One of the more-popular variants of this family was the 1.2 L (1,169 cc) TB unit found in the Familia/1200. Bore was 70 mm (2.8 in) and stroke was 76 mm (3.0 in). The 1200 Coupé used a Hitachi/Stromberg carburetor and 8.6:1 compression to produce 68 PS (50 kW) at 6,000 rpm and 9.6 kg·m (94 N·m) at 3,000 rpm.[4]

VA

The VA first appeared in the Mazda D2000 of April 1962. With a bore and stroke of 82 and 94 mm, displacement is 2.0 litres (1,985 cc) . Power output was originally 81 PS (60 kW) at 4600 rpm,[5] but later models have 92 PS (68 kW) at 5000 rpm.[6]

See also

References

  1. ↑ "自動車ガイドブック 1968年~69年新" [Japanese motor vehicles guide book 1968/1969] (in Japanese) 15. Japan: Japan Automobile Manufacturers Association. 1968-10-25: 138, 160.
  2. 1 2 3 4 Ozeki, Kazuo (2007). 日本のトラック・バス 1918~1972 [Japanese Trucks and Buses 1918-1972:] (in Japanese). Tokyo: Miki Press. p. 156. ISBN 978-4-89522-494-9.
  3. ↑ Tanegawa, Takeshi (長谷川) (June 2007). "Mazda Familia Model SSA" (PDF). Letter from Toyota Museum (トヨタ博物館だより) (in Japanese) (Toyota Motor Corporation) (71): 5–7. Retrieved 2011-07-16.
  4. ↑ 絶版車カタログ 国産車編 Part1 1950~1969 (Eichi Mook) [Japanese Vintage Car Guide: Car Catalog part 1, 1950–1969]. Tokyo: Eichi Publishing (英知出版). 1996. p. 64. ISBN 4-7542-5055-9.
  5. ↑ Ozeki, p. 150
  6. 1 2 自動車ガイドブック: Japanese motor vehicles guide book (in Japanese) (Japan: Japan Automobile Manufacturers Association) 20: 279. 1973-10-30. Check date values in: |year= (help); Missing or empty |title= (help)
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