BMW M328

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BMW M328 engine
BMW 328 6-Zylinder-Motor.jpg
Displacement122 cu in (2.0 L)
Block materialAluminium
Head materialAluminium
Fuel typePetrol
PredecessorBMW M78
SuccessorBMW M335

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]

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.


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]


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


See also[edit]


  1. ^ "BMW World - 6-Cylinder Engines". Archived from the original on 13 September 2010.
  2. ^ "1937 BMW 328". Retrieved 23 August 2017.
  3. ^ a b c d "BMW 328 - the legendary roadster". 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". Retrieved 24 August 2017.