| BMW M337 | |
|---|---|
.jpg) 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. As per the M78, the M337 has an iron engine block, an iron cylinder head and overhead valves with two valves per cylinder.
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.
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. 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.
Applications:
- 1955-1958 501/3
References
- ^ 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.
- ^ Noakes, Andrew (2008). The Ultimate History of BMW. Parragon Books. ISBN 978-1-4075-3512-8.
- ^ "BMW M337". www.6enligne.net. Archived from the original on 11 June 2012.
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