BMW M44

BMW M44 engine
Overview
Production1996–2000
Layout
ConfigurationInline-4
Displacement1.9 L (1,895 cc)
Cylinder bore85 mm (3.35 in)
Piston stroke83.5 mm (3.29 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainDOHC
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M42
SuccessorBMW N42

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.

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:

  • 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

References

  1. ^ "BMW M44B19 automotive engine". bmw-grouparchiv.de. Retrieved 14 August 2019.
  2. ^ "M42 vs M44". www.318ti.org. Retrieved 6 March 2017.
  3. ^ "Whats a quick way to tell a M44 engine from a M42 engine?". www.bimmerforums.com. Retrieved 6 March 2017.
  4. ^ "BMW M42 and M44 Four Cylinder Engines". www.unixnerd.demon.co.uk. Archived from the original on 8 May 2019. Retrieved 12 March 2017.
  5. ^ "Japanese BMW M44 engine document". Retrieved 12 February 2020.
  6. ^ "BMW M44 Engine Technical Information (1996)". Retrieved 12 February 2020.
  7. ^ "BMW M44 engine". www.australiancar.reviews. Archived from the original on 11 August 2020. Retrieved 3 March 2019.
  8. ^ "BMW Heaven Specification Database | Engine specifications for M44 engines". www.bmwheaven.com. Retrieved 2012-06-03.
  9. ^ "Motronic 5.2 (M44)". www.318ti.org. Retrieved 7 March 2017.
  10. ^ "BMW M44 Engine Technical Information (1996)". www.bmw3series.johnavis.com. Retrieved 7 March 2017.
  11. ^ "Whats the difference between M44 and M42?". www.bimmerforums.co.uk. Retrieved 7 March 2017.

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