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| Mazda OHV engine | |
|---|---|
| Overview | |
| Manufacturer | Mazda |
| Layout | |
| Configuration | Straight-2 &straight-4 |
| Displacement | 0.4 L (358 cc) 0.6 L (586 cc) 0.8 L (782 cc) 1.0 L (987 cc) 1.2 L (1,169 cc) 2.0 L (1,985 cc) |
| Cylinder bore | 46 mm (1.8 in) 54 mm (2.1 in) 58 mm (2.3 in) 68 mm (2.7 in) 70 mm (2.8 in) 75 mm (3.0 in) 82 mm (3.2 in) |
| Piston stroke | 54 mm (2.1 in) 64 mm (2.5 in) 68 mm (2.7 in) 74 mm (2.9 in) 76 mm (3.0 in) 84 mm (3.3 in) 94 mm (3.7 in) |
| Valvetrain | OHV |
| Compression ratio | 8.5:1, 8.6:1, 9.0:1 |
| Combustion | |
| Fuel system | Hitachi/Stromberg carburettor |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 33–92 PS (24–68 kW) |
| Torque output | 39.2 N⋅m (29 lb⋅ft) |
After an early flirtation withV-twin engines,Mazda's smallcars of the 1960s were powered byOHVstraight-2 andstraight-4 engines. This family lasted from 1961 until the mid-1970s. Today, Mazda's keicars use Suzuki engines. It was produced at theHiroshima Plant inHiroshima, Japan.
The engine was a two-stroke, water-cooled straight-twin engine used in theMazda Chantez andMazda Porterkei car and truck unique to Japan from 1972 until 1976. The displacement is 359 cc (21.9 cu in), producing 24.3 kW (33 PS) and 39.2 N⋅m (29 lb⋅ft) oftorque.[1]
The 358 cc (21.8 cu in)water-cooled OHV straight-fourDA engine, used in the 1962P360 Carol had a tiny 46 mm × 54 mm (1.8 in × 2.1 in) bore and stroke. This was one of thesmallest production four-cylinder automobile engines in history, only beaten byHonda's 356 cc (21.7 cu in) inline-four unit used in theT360 truck. The engine's small size was dictated byJapan'skei car rules which offered special status to vehicles with engines displacing less than 360 cc (22 cu in). Mazda's tiny OHV was the only four-cylinder in the class in the 1960s, but was outperformed by2-stroke andI3 powerplants from other companies.
When fitted to theB360/Porter light truck and van, the engine received theDB engine code.[2]
The 586 cc (35.8 cu in)RA engine was a larger version of the 358 cc (21.8 cu in) engine 54 mm × 64 mm (2.13 in × 2.52 in). It was used in the 1962-1964P600 Carol and produced 28 PS (21 kW) and 4.2 kg⋅m (41 N⋅m; 30 lb⋅ft) of torque.
TheSA, a larger 782 cc (47.7 cu in) engine powered the 1963-1967Mazda Familia and the 1966Mazda Bongo. Bore and stroke was 58 mm × 74 mm (2.28 in × 2.91 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.[3] 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.[4]
The 1.0 L (987 cc)PB engine, a separate development, used a square 68 mm (2.68 in) bore and stroke. It was a water-cooled OHV engine and first powered the 1967Mazda Familia 1000. Output ranged from 52 to 58 PS (38 to 43 kW), depending on the application.
One of the more-popular variants of this family was the 1.2 L (1,169 cc)TB unit found in theFamilia/1200. Bore and stroke was 70 mm × 76 mm (2.76 in × 2.99 in). The 1200 Coupé used aHitachi/Stromberg carburettor and 8.6:1 compression to produce 68 PS (50 kW) at 6000 rpm and 9.6 kg⋅m (94 N⋅m; 69 lbf⋅ft) at 3000 rpm.[5] This engine was built from 1968 until 1970 for passenger cars, until 1971 for the Familia Truck.
TheUA (and the similarUB, for use in three-wheeled trucks) is a 1484 cc water-cooledoverhead valveinline-four engine. It has a bore of 75 mm (3.0 in) and a stroke of 84 mm (3.3 in). As installed in the original 1960 D1500 four-wheel truck, equipped with a sidedraft carburetor, it has a maximum horsepower of 60 PS (44 kW) at 4600 rpm and a maximum torque of 10.4 kg⋅m (102 N⋅m; 75 lbf⋅ft) at 3000 rpm. TheB1500's output remained the same but for the second generation B1500 an improved engine cylinder head and valves and a downdraft carburetor increased the maximum horsepower to 72 PS (53 kW) at 5200 rpm and a maximum torque of 12.0 kg⋅m (118 N⋅m; 87 lbf⋅ft) at 3400 rpm.
UA:
UB:
The VA first appeared in the Mazda D2000 of April 1962. With a bore and stroke of 82 mm × 94 mm (3.23 in × 3.70 in), displacement is 2.0 L (1,985 cc). Power output was originally 81 PS (60 kW) at 4600 rpm,[6] but later models have 92 PS (68 kW) at 5000 rpm.[7]
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