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]
| BMW M328 engine | |
|---|---|
 | |
| Overview | |
| Production | 1936-1940 |
| Layout | |
| Configuration | Straight-6 |
| Displacement | 2.0 L (1,971 cc) |
| Cylinder bore | 66 mm (2.60 in) |
| Piston stroke | 96 mm (3.78 in) |
| Cylinder block material | Aluminium |
| Cylinder 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[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
editThe 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
edit| 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
editReferences
editNotes
edit- ^ "BMW World - 6-Cylinder Engines". www.usautoparts.net. Archived from the original on 13 September 2010.
- ^ a b Lewin & Purves 2016.
- ^ a b Lewin 2004, pp. 191, 192, 251, 253, 257.
- ^ "1937 BMW 328". www.carfolio.com. Retrieved 23 August 2017.
- ^ a b c d "BMW 328 - the legendary roadster". www.bmwccn.no. Archived from the original on 3 January 2010.
- ^ Norbye 1984.
- ^ "1937 BMW 328". www.carfolio.com. Retrieved 24 August 2017.
Bibliography
edit- 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.