BMW M337
| BMW M337 | |
|---|---|
 BMW 501- the first car to use the M337 | |
| Overview | |
| Production | 1952-1958 |
| Layout | |
| Configuration | Straight-6 |
| Displacement | 2.0–2.1 L (122–128 cu in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Cast iron |
| Valvetrain | OHV |
| Combustion | |
| Fuel type | Petrol |
| Chronology | |
| Predecessor | BMW M78 |
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.[1]: 88 [2] As per the M78, the M337 has an iron engine block, an iron cylinder head and overhead valves with two valves per cylinder.[3]: 46
Versions
| Model | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| M337/1 | 1,971 cc (120.3 cu in) | 48 kW (65 PS; 64 hp) at 4,400 rpm |
129 N⋅m (95 lb⋅ft) at 2,000 rpm |
1952-1954 |
| M337/2 | 54 kW (73 PS; 72 hp) at 4,400 rpm |
130 N⋅m (96 lb⋅ft) at 2,500 rpm |
1954-1955 | |
| M337/3 | 2,077 cc (126.7 cu in) | 135 N⋅m (100 lb⋅ft) at 2,500 rpm |
1955-1958 |
M337/1
The first version of the M337 engine has a displacement of 120.3 cu in (1,971 cc). It produces 48 kW (65 PS) at 4,400 rpm and 129 N⋅m (95 lb⋅ft) at 2,000 rpm.[4]
Applications:
- 1952-1954 501
M337/2
In 1954, a revised engine was released which produced 54 kW (73 PS) at 4,400 rpm and 130 N⋅m (96 lb⋅ft) at 2,500 rpm.[1][4][3]: 48 The compression ratio for this engine is 6.8:1.
Applications:
M337/3
The final version of the M337 had an increase in bore of 2 mm (0.079 in), which increased displacement to 2,077 cc (126.7 cu in). 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 135 N⋅m (100 lb⋅ft) at 2,500 rpm.[1]: 92 [4]
Applications:
- 1955-1958 501/3
References
- ^ a b c Norbye, Jan P. (1984). BMW - Bavaria's Driving Machines. Skokie, IL: Publications International. ISBN 0-517-42464-9.
- ^ "BMW 501". Auto- und Motorrad-Welt (in German). Köln: Deutscher Sportverlag Kurt Stoof. 20 March 1953.
- ^ a b Noakes, Andrew (2008). The Ultimate History of BMW. Parragon Books. ISBN 978-1-4075-3512-8.
- ^ a b c "BMW M337". www.6enligne.net. Archived from the original on 11 June 2012.