BMW M328
The BMW M328 is an overhead valve straight-six petrol 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]
| BMW M328 engine | |
|---|---|
 | |
| Overview | |
| Production | 1936-1940 |
| Layout | |
| Configuration | Straight-6 |
| Displacement | 122 cu in (2.0 L) |
| Block material | Aluminium |
| 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[2] with hemispherical combustion chambers.[3]
The M328 was used in the BMW 328 and BMW 327/28 coupes.[4]
After World War II the engine was also licensed to Bristol Cars in the United Kingdom.
Design
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.[3] 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.[3]
The M328 engine has a compression ratio of 7.5:1 and produces 59 kW (79 bhp) at 5000 rpm.[3][5]
Versions
| 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 |
Applications:
See also
References
- "BMW World - 6-Cylinder Engines". www.usautoparts.net. Archived from the original on 13 September 2010.
- "1937 BMW 328". www.carfolio.com. Retrieved 23 August 2017.
- "BMW 328 - the legendary roadster". www.bmwccn.no. Archived from the original on 3 October 2010.
- Norbye, Jan P. (1984). BMW - Bavaria's Driving Machines. Skokie, IL: Publications International. ISBN 0-517-42464-9.
- "1937 BMW 328". www.carfolio.com. Retrieved 24 August 2017.