BMW M337
{{Infobox automobile engine
|name=BMW M337
|image=BMW 501 (5444397631).jpg
|caption=BMW 501- the first car to use the M337
|production=1952-1958
|configuration= Straight-6
|displacement={{convert|2.0|-|2.1|L|cuin|0|abbr=on}}
|valvetrain=OHV
|block=Cast iron
|head=Cast iron
|fueltype=Petrol
|predecessor=BMW M78
|successor=
}}
The BMW M337 is a straight-6 OHV petrol engine installed at a slanted angle which was produced in three variants (M337/1, M337/2 and M337/3) from 1952-1958. Built to power BMW's first new car after World War II, the M337 engine was a replacement for the BMW M78.
Design
Compared with its M78 predecessor, the M337 features a revised cylinder head, a new inlet manifold and a reinforced crankshaft with bigger, more modern bearings.{{cite book |last=Norbye |first=Jan P. |title=BMW - Bavaria's Driving Machines |year=1984 |publisher=Publications International |location=Skokie, IL |isbn=0-517-42464-9 |url-access=registration |url=https://archive.org/details/bmwbavariasdrivi00norb }}{{refpage|page=88}}{{cite magazine | date = 20 March 1953 |title = BMW 501 | magazine = Auto- und Motorrad-Welt | publisher = Deutscher Sportverlag Kurt Stoof | location = Köln | language = de }} As per the M78, the M337 has an iron engine block, an iron cylinder head and overhead valves with two valves per cylinder.{{cite book|last1=Noakes|first1=Andrew|title=The Ultimate History of BMW|date=2008|publisher=Parragon Books|isbn=978-1-4075-3512-8}}{{refpage|page=46}}
Versions
| class="wikitable" style="text-align: center;" | ||||
| Model | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| M337/1 | rowspan=2|{{convert|1971|cc|cuin|1|abbr=on}} | {{convert|48|kW|PS hp|0|abbr=on}} at 4,400 rpm | {{convert|129|Nm|lbft|0|abbr=on}} at 2,000 rpm | 1952-1954 |
| M337/2 | rowspan=2|{{convert|54|kW|PS hp|0|abbr=on}} at 4,400 rpm | {{convert|130|Nm|lbft|0|abbr=on}} at 2,500 rpm | 1954-1955 | |
| M337/3 | {{convert|2077|cc|cuin|1|abbr=on}} | {{convert|135|Nm|lbft|0|abbr=on}} at 2,500 rpm | 1955-1958 |
= M337/1 =
The first version of the M337 engine has a displacement of {{convert|1971|cc|cuin|1|abbr=on|order=flip}}. It produces {{cvt|48|kW|PS|0}} at 4,400 rpm and {{convert|129|Nm|lbft|abbr=on}} at 2,000 rpm.{{cite web|url=http://www.6enligne.net/html/modeles/fiche_moteur.php3?idMoteur=15 |title=BMW M337 |website=www.6enligne.net |url-status=dead |archive-url=https://web.archive.org/web/20120611124634/http://www.6enligne.net/html/modeles/fiche_moteur.php3?idMoteur=15 |archive-date=11 June 2012}}
Applications:
- 1952-1954 501
= M337/2 =
= M337/3 =
The final version of the M337 had an increase in bore of {{convert|2|mm|in|abbr=on}}, which increased displacement to {{convert|2077|cc|cuin|1|abbr=on}}. The compression ratio was also increased to 7.0:1. Despite these changes the M337/3 produced no more power than the previous version. However torque increased to {{convert|135|Nm|lbft|0|abbr=on}} at 2,500 rpm.{{refpage|page=92}}
Applications:
- 1955-1958 501/3
References
{{reflist|30em}}
{{BMW automotive petrol engines: 1940s to 1960s}}