Reciprocating internal combustion engine
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:
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:
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