Tuning Wiki

BMW M328 engines

BMW M328 engine identification, specifications and recorded variants.

Updated by llandowtuninguk@gmail.com   Revision 3

BMW automotive engine families listed as M328. Specifications below retain the source's separate family and variant labels.

Family specifications

BMW M328 engine

FieldReported value
Production1936–1940
ConfigurationStraight-6
Displacement2.0 L (1,971 cc)
Cylinder bore66 mm (2.60 in)
Piston stroke96 mm (3.78 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
ValvetrainOHV
Fuel typePetrol
PredecessorBMW M78
SuccessorBMW M335

Variant specifications

Versions

VersionDisplacementPowerTorqueYears
M3281,971 cc (120.3 cu in)59 kW (79 bhp) at 5000 rpm126 N⋅m (93 lb⋅ft) at 4000 rpm1936–1940

BMW automotive engine directory

Design, development and variant notes

The M328 developed the M78 straight-six with an aluminium cross-flow head and hemispherical chambers. One low-mounted camshaft actuates the valves using vertical and cross-head horizontal pushrods.

The 1,971 cc version uses three Solex 30 JF carburettors; the cited article gives 59 kW and a 7.5:1 compression ratio. Bristol licensed the design after the Second World War.

Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.

Sources

Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.

Further Wikipedia-sourced details

The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.

Additional recorded applications

Source version or ratingVehicle application as recorded
Versions1936–1940 328
Versions1937–1940 327/28
Versions1947–1950 HH