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. It was produced alongside the
BMW M43
The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002. The M43 powered base-model cars, while higher performance models at the time were powered by the BMW M42 and BMW M44 DOHC engines. The M43 was produced at the ...
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 arm
In the context of an internal combustion engine, a rocker arm is a valvetrain component that typically transfers the motion of a pushrod to the corresponding intake/exhaust valve.
Rocker arms in automobiles are typically made from stamped steel ...
s, a
hot-wire MAF,
displacement increased from and other detail changes such as a grey casst 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, 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:
* 1996-2000
E36 318i (North America only), 318is and 318ti
* 1996-1999
Z3 1.9
With time this engine was replaced by
BMW N42 engine.
See also
*
BMW
*
List of BMW engines
BMW has been producing engines for automobiles, motorcycles and aircraft since 1917, when the company began production of an inline-six aircraft engine. They have been producing automobile engines since 1933.
Motorcycle engines
Automotive ...
References
{{BMW automotive petrol engines: 1980s to 2000s
M44
Straight-four engines
Gasoline engines by model