BMW M44
The BMW M44 is a DOHC four-cylinder petrol engine which replaced the BMW M42 and was produced from 1996-2000 at the Steyr factory. 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 revised rocker arms, a hot-wire MAF, displacement increased from and other detail changes. 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, however mid-range power is increased significantly and peak torque is increased by at 200 rpm lower. There was also a 70% reduction in valve train friction which contributed to the engine being more quiet and fuel efficient than its predecessor. The M44 has a cast iron block and aluminium cylinder head, as per its predecessor. Versions. M44B19. The M44B19 has a displacement of , which is achieved through a bore of and a stroke of . A compression ratio of 10.0:1 is used, along with the Bosch Motronic 5.2 engine management system. The crankshaft has an increased  stroke from the M42's and is cast instead of forged. Also revised were the valve actuators which are of a roller pivoting arm type. Applications: With time this engine was replaced by BMW N42 engine.