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Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
The BMW M328 is an overhead valve straight-six petrol internal combustion engine which was produced from 1936 to 1940. It was a high-performance development of the BMW M78 engine that was produced alongside the M78.[1][2][3]
BMW M328 engine | |
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Overview | |
Production | 1936-1940 |
Layout | |
Configuration | Straight-6 |
Displacement | 2.0 L (1,971 cc) |
Cylinder bore | 66 mm (2.60 in) |
Piston stroke | 96 mm (3.78 in) |
Cylinder block material | Aluminium |
Cylinder head material | Aluminium |
Valvetrain | OHV |
Combustion | |
Fuel type | Petrol |
Chronology | |
Predecessor | BMW M78 |
Successor | BMW M335 |
Compared with the M78, the M328 has an aluminium cross-flow cylinder head[4] with hemispherical combustion chambers.[5]
The M328 was used in the BMW 328 and BMW 327/28 coupes.[2][3][6]
After World War II the engine was also licensed to Bristol Cars in the United Kingdom.
The M328 had an unusual valvetrain design; although the camshaft is located in the engine block, the exhaust valves are actuated by a transverse pushrod from the intake valves.[5] This results in a valve layout similar to a DOHC engine.
With a bore of 66 mm (2.60 in) and a stroke of 96 mm (3.78 in), the displacement was 1,971 cc (120.3 cu in), the same as its M78 predecessor. Fuel supply was via three Solex "30 JF downdraft" carburetors.[5]
The M328 engine has a compression ratio of 7.5:1 and produces 59 kW (79 bhp) at 5000 rpm.[5][7]
Version | Displacement | Power | Torque | Years |
---|---|---|---|---|
M328 | 1,971 cc (120.3 cu in) | 59 kW (79 bhp) @ 5000 rpm | 126 N⋅m (93 lb⋅ft) @ 4000 rpm | 1936-1940 |
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