| BMW M337 | |
| Production: | 1952-1958 |
| Configuration: | Straight-6 |
| Displacement: | 2- |
| Valvetrain: | OHV |
| Block: | Cast iron |
| Head: | Cast iron |
| Fueltype: | Petrol |
| 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.
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] [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]
| Model | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| M337/1 | 19711NaN1 | 480NaN0 at 4,400 rpm | 1290NaN0 at 2,000 rpm | 1952-1954 |
| M337/2 | 540NaN0 at 4,400 rpm | 1300NaN0 at 2,500 rpm | 1954-1955 | |
| M337/3 | 20771NaN1 | 1350NaN0 at 2,500 rpm | 1955-1958 |
The first version of the M337 engine has a displacement of 1971cc. It produces at 4,400 rpm and 129Nm at 2,000 rpm.[4]
Applications:
In 1954, a revised engine was released which produced at 4,400 rpm and 1300NaN0 at 2,500 rpm.[1] [3] The compression ratio for this engine is 6.8:1.
Applications:
The final version of the M337 had an increase in bore of 2mm, which increased displacement to 20771NaN1. 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 1350NaN0 at 2,500 rpm.[1]
Applications: