BMW M44
Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
The BMW M44 is a DOHC four-cylinder petrol engine which replaced the BMW M42 and was produced from 1996 to 2000 at the Steyr factory.[1] It was produced alongside the BMW M43 SOHC four-cylinder engine, with the M44 being the higher performance engine. In 2000, the M44 was replaced by the BMW N42 engine.
| BMW M44 engine | |
|---|---|
| |
| Overview | |
| Production | 1996–2000 |
| Layout | |
| Configuration | Inline-4 |
| Displacement | 1.9 L (1,895 cc) |
| Cylinder bore | 85 mm (3.35 in) |
| Piston stroke | 83.5 mm (3.29 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC |
| Combustion | |
| Fuel type | Petrol |
| Chronology | |
| Predecessor | BMW M42 |
| Successor | BMW N42 |
Design
Compared with the M42, the M44 has roller rocker arms,[2] a hot-wire MAF,[3] displacement increased from 1.8 to 1.9 L (110 to 116 cu in) and other detail changes such as a grey cast iron crankshaft replacing the forged steel item from the previous M42. As per the final versions of the M42, the M44 has a dual length intake manifold ("DISA"). Peak power is the same as the M42,[4] however mid-range power is increased significantly and peak torque is increased by 5 N⋅m (4 lb⋅ft) at 200 rpm lower.[5] There was also a 70% reduction in valve train friction which contributed to the engine being more quiet and fuel efficient than its predecessor.[6]
The M44 has a cast iron block and aluminium cylinder head, as per its predecessor.[7]
Versions
| Version | Displacement | Power | Torque | Years |
|---|---|---|---|---|
| M44B19 | 1,895 cc (115.6 cu in) | 103 kW (138 bhp) at 6,000 rpm | 180 N⋅m (133 lb⋅ft) at 4,300 rpm | 1996–2000 |
M44B19
The M44B19 has a displacement of 1,895 cc (115.6 cu in),[8] which is achieved through a bore of 85.0 mm (3.35 in) and a stroke of 83.5 mm (3.29 in). A compression ratio of 10.0:1 is used, along with the Bosch Motronic 5.2 engine management system.[9]
The crankshaft has an increased stroke from the M42's 81 mm (3.19 in) and is cast instead of forged.[10] Also revised were the valve actuators which are of a roller pivoting arm type.[11]
Applications:
With time this engine was replaced by BMW N42 engine.
See also
References
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