BMW M328
{{Infobox automobile engine
|name = BMW M328 engine
|image = BMW 328 6-Zylinder-Motor.jpg
|production = 1936-1940
|configuration= Straight-6
|valvetrain = OHV
|fueltype = Petrol
|block = Aluminium
|head = Aluminium
| displacement = {{convert|1971|cc|L|1|order=flip|abbr=on}}
| bore = {{convert|66|mm|in|2|abbr=on}}
| stroke = {{convert|96|mm|in|2|abbr=on}}
|predecessor = BMW M78
|successor = BMW 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.{{cite web|url= http://www.usautoparts.net/bmw/engines/6cyl.htm |title= BMW World - 6-Cylinder Engines |website=www.usautoparts.net |archiveurl = https://web.archive.org/web/20100913093117/http://www.usautoparts.net/bmw/engines/6cyl.htm |archivedate = 13 September 2010}}{{sfn|Lewin|Purves|2016}}{{sfn|Lewin|2004|pages=191, 192, 251, 253, 257}}
Compared with the M78, the M328 has an aluminium cross-flow cylinder head{{cite web|title=1937 BMW 328|url=http://www.carfolio.com/specifications/models/car/?car=56551|website=www.carfolio.com|accessdate=23 August 2017}} with hemispherical combustion chambers.{{cite web|url=http://www.bmwccn.no/eng/chapter2/articles/roadster2.htm|title=BMW 328 - the legendary roadster|website=www.bmwccn.no|archiveurl=https://web.archive.org/web/20100103093806/http://www.bmwccn.no/eng/chapter2/articles/roadster2.htm|archivedate=3 January 2010|url-status=dead}}
The M328 was used in the BMW 328 and BMW 327/28 coupes.{{sfn|Lewin|Purves|2016}}{{sfn|Lewin|2004|pages=191, 192, 251, 253, 257}}{{sfn|Norbye|1984}}
After World War II the engine was also licensed to Bristol Cars in the United Kingdom.
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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. This results in a valve layout similar to a DOHC engine.
With a bore of {{convert|66|mm|in|2|abbr=on}} and a stroke of {{convert|96|mm|in|2|abbr=on}}, the displacement was {{convert|1971|cc|cuin|1|abbr=on}}, the same as its M78 predecessor. Fuel supply was via three Solex "30 JF downdraft" carburetors.
The M328 engine has a compression ratio of 7.5:1 and produces {{convert|59|kW|bhp|0|abbr=on}} at 5000 rpm.{{cite web|title=1937 BMW 328|url=http://www.carfolio.com/specifications/models/car/?car=56551|website=www.carfolio.com|accessdate=24 August 2017}}
Versions
See also
References
=Notes=
{{Reflist|30em}}
=Bibliography=
- {{cite book |last1=De Ste. Croix |first1=Philip |last2=Noakes |first2=Andrew |title=The Ultimate History of BMW |location=United Kingdom|publisher=Parragon Book Service Limited |isbn=9781407549781 |date=September 2010 |type=Hardcover |language=English}}
- {{cite book |last1=Gillies |first=Mark |last2=Sedgwick |first2=Michael |title=A-Z of Cars, 1945-1970 |location=United Kingdom|publisher=Herridge & Sons Limited |isbn=9781906133269 |date=October 28, 2010 |type=Paperback |language=English}}
- {{cite book |last1=Hudock |first1=Greg |title=BMW 3 Series - E36 Restoration Tips & Techniques |location=United Kingdom|publisher=Brooklands Books |isbn=9781855209701 |date=October 14, 2012 |type=ebook |language=English}}
- {{cite book |pages=191, 192, 251, 253, 257 |last1=Lewin |first1=Tony |title=The Complete Book of BMW |location=N.p. |publisher=MotorBooks International |isbn=9781610592055 |language=English |date=December 25, 2004}}
- {{cite book |last1=Lewin |first1=Tony |title=The BMW Century: The Ultimate Performance Machines |date=2016|type=Hardcover|language=English |first2=Tom |last2=Purves|publisher=Motorbooks Press |isbn=9780760350171 |url=https://books.google.com/books?id=vNUsDQAAQBAJ |access-date=21 January 2023}}
- {{cite book |last1=Norbye |first1=Jan P.|title=BMW, Bavaria's Driving Machines |location=Skokie, Illinois, United States|publisher=Random House Value Publishing, Publications International |url=https://archive.org/details/bmwbavariasdrivi00norb |year=1984 |isbn=9780517424643 |type=Hardcover |language=English}}
{{BMW_automotive_petrol_engines:_1920s_to_1940s}}