BMW M44
Template:Infobox automobile engine
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.<ref>Template:Cite web</ref> 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.
Design
Compared with the M42, the M44 has roller rocker arms,<ref>Template:Cite web</ref> a hot-wire MAF,<ref>Template:Cite web</ref> displacement increased from Template:Convert 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,<ref>Template:Cite web</ref> however mid-range power is increased significantly and peak torque is increased by Template:Convert at 200 rpm lower.<ref>Template:Cite web</ref> There was also a 70% reduction in valve train friction which contributed to the engine being more quiet and fuel efficient than its predecessor.<ref>Template:Cite web</ref>
The M44 has a cast iron block and aluminium cylinder head, as per its predecessor.<ref>Template:Cite web</ref>
Versions
| Version | Displacement | Power | Torque | Years |
|---|---|---|---|---|
| M44B19 | Template:Convert | Template:Convert at 6,000 rpm |
Template:Convert at 4,300 rpm |
1996–2000 |
M44B19
The M44B19 has a displacement of Template:Convert,<ref>Template:Cite web</ref> which is achieved through a bore of Template:Convert and a stroke of Template:Convert. A compression ratio of 10.0:1 is used, along with the Bosch Motronic 5.2 engine management system.<ref>Template:Cite web</ref>
The crankshaft has an increased stroke from the M42's Template:Convert and is cast instead of forged.<ref>Template:Cite web</ref> Also revised were the valve actuators which are of a roller pivoting arm type.<ref>Template:Cite web</ref>
Applications:
With time this engine was replaced by BMW N42 engine.