BMW M42

BMW M42
Overview
ManufacturerBMW
Production1989–1996
Layout
ConfigurationNaturally aspirated straight-4
Displacement1.8 L (1,796 cc)
Cylinder bore84 mm (3.31 in)
Piston stroke81 mm (3.19 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainDOHC
Compression ratio10.0:1
Combustion
Fuel systemFuel injection
Fuel typePetrol
Chronology
PredecessorBMW M40
SuccessorBMW M44

The BMW M42 is a DOHC straight-four petrol engine which was produced from 1989-1996.[1] It is BMW's first mass-production DOHC engine and was produced alongside the BMW M40 SOHC four-cylinder engine as the higher performance engine.

The M42 was replaced by the BMW M44, which was introduced in 1996.

Compared with the M40, the M42 features a DOHC valvetrain, a timing chain, hydraulic valve lifters and an increased 10.0:1 compression ratio.[2] Later versions of the M42 also feature a dual length intake manifold ("DISA").[2]

The M42 was used as the basis for the S42 racing engine, which powered the BMW 320i in the German Super Tourenwagen Cup.

  1. ^ "Information on M42 engines". www.bmwheaven.com. Retrieved 18 February 2017.
  2. ^ a b "BMW E30 specifications". www.e30world.com. Archived from the original on 2013-02-24.