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
Production1936-1940
Layout
ConfigurationStraight-6
Displacement122 cu in (2.0 L)
Block materialAluminium
Head materialAluminium
ValvetrainOHV
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M78
SuccessorBMW 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
VersionDisplacementPowerTorqueYears
M3281,971 cc (120.3 cu in)59 kW (79 bhp)
@ 5000 rpm		126 N⋅m (93 lb⋅ft)
@ 4000 rpm		1936-1940

Applications:

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gollark: You have to be able to detect if an object is an AType or BType.
gollark: Imagine you got a list containing both ATypes and BTypes and want to display a list of them or something. The logic for each is somewhat different because they represent slightly different entities.
gollark: You could just have a "thing type" field in them but then you're just doing tagged unions in an indirect way.
gollark: If you want, say, a list of AType values and BType ones, TS has *un*tagged union types for that, but you then have to do stupid stuff to discriminate between them.

See also

References
  1. "BMW World - 6-Cylinder Engines". www.usautoparts.net. Archived from the original on 13 September 2010.
  2. "1937 BMW 328". www.carfolio.com. Retrieved 23 August 2017.
  3. "BMW 328 - the legendary roadster". www.bmwccn.no. Archived from the original on 3 October 2010.
  4. Norbye, Jan P. (1984). BMW - Bavaria's Driving Machines. Skokie, IL: Publications International. ISBN 0-517-42464-9.
  5. "1937 BMW 328". www.carfolio.com. Retrieved 24 August 2017.
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