BMW M328 engine
Overview
Production1936-1940
Layout
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
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M78
SuccessorBMW M335

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]

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.

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.[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]

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:

See also

References

Notes

  1. ↑ "BMW World - 6-Cylinder Engines". www.usautoparts.net. Archived from the original on 13 September 2010.
  2. 1 2 Lewin & Purves 2016.
  3. 1 2 Lewin 2004, pp. 191, 192, 251, 253, 257.
  4. ↑ "1937 BMW 328". www.carfolio.com. Retrieved 23 August 2017.
  5. 1 2 3 4 "BMW 328 - the legendary roadster". www.bmwccn.no. Archived from the original on 3 January 2010.
  6. ↑ Norbye 1984.
  7. ↑ "1937 BMW 328". www.carfolio.com. Retrieved 24 August 2017.

Bibliography

  • De Ste. Croix, Philip; Noakes, Andrew (September 2010). The Ultimate History of BMW (Hardcover). United Kingdom: Parragon Book Service Limited. ISBN 9781407549781.{{cite book}}: CS1 maint: date and year (link)
  • Gillies, Mark; Sedgwick, Michael (October 28, 2010). A-Z of Cars, 1945-1970 (Paperback). United Kingdom: Herridge & Sons Limited. ISBN 9781906133269.{{cite book}}: CS1 maint: date and year (link)
  • Hudock, Greg (October 14, 2012). BMW 3 Series - E36 Restoration Tips & Techniques (ebook). United Kingdom: Brooklands Books. ISBN 9781855209701.{{cite book}}: CS1 maint: date and year (link)
  • Lewin, Tony (December 25, 2004). The Complete Book of BMW. N.p.: MotorBooks International. pp. 191, 192, 251, 253, 257. ISBN 9781610592055.
  • Lewin, Tony; Purves, Tom (2016). The BMW Century: The Ultimate Performance Machines (Hardcover). Motorbooks Press. ISBN 9780760350171. Retrieved 21 January 2023.
  • Norbye, Jan P. (1984). BMW, Bavaria's Driving Machines (Hardcover). Skokie, Illinois, United States: Random House Value Publishing, Publications International. ISBN 9780517424643.
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