BMW M43


The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991 to 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 Steyr engine plant.
A version using natural gas was produced for the E36 318i and the E34 518i.
Following the introduction of the BMW N42 engine in 2001, the M43 began to be phased out.

Design

Compared with its BMW M40 predecessor, the M43 features both a camshaft position sensor and a knock sensor as well as roller rockers and a timing chain. It also features a dual length intake manifold, to provide torque across a wider rev range.
In 1998 the displacement was increased to, increasing torque to at 3900 rpm.

Versions

VersionDisplacementPowerTorqueYearNote
[|M43B16]
at 5500 rpm
at 3900 rpm		1991-1999
M43B16
at 5500 rpm
at 3900 rpm		1995-2000CNG
[|M43B18]
at 5500 rpm
at 3900 rpm		1993
M43B18
at 5500 rpm
at 3900 rpm		1995-1996CNG
[|M43B19]
at 5500 rpm
at 3900 rpm		1998
M43B19
at 5300 rpm
at 2500 rpm		1999

M43B16

The M43B16 produces and of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system. There was also a natural gas-powered version of this car for the 1995 BMW 316g Compact.
Applications:
  • 1994-1998 E36 316i
  • 1995-2000 E36/5 316g Compact
  • 1998-1999 E46 316i
Engine Management Systems:
  • 1993-09/1995 Bosch Motronic 1.7.2
  • 1995-09/1997 Bosch Motronic 1.7.3
  • 1997-2000 BMS43

M43B18

The M43B18 has a displacement. It produces and and uses the Bosch Motronic 1.7.1 fuel injection system. There was also a less powerful natural gas-powered version of this car for the BMW 518g Touring. This model was only available for two years.
Applications:

M43B19

The M43B19 is the largest M43 engine, with a displacement of. It produces up to and, and uses BMW's BMS 46 engine management system. The versions do not have the DISA intake manifold and also have a smaller camshaft compared to the 118 PS versions. Note the M43B16, M43B18 and the M43B19 all have the same camshaft.
Applications— and :
  • 1999-2001 E36 316i Compact
  • 1999-2002 E46 316i
Applications— and :
  • 1998-2001 E46 318i/318Ci
  • 1999 -2002 Z3 1.9