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

Version	Displacement	Power	Torque	Year	Note
[\|M43B16]		at 5500 rpm	at 3900 rpm	1991-1999
M43B16		at 5500 rpm	at 3900 rpm	1995-2000	CNG
[\|M43B18]		at 5500 rpm	at 3900 rpm	1993
M43B18		at 5500 rpm	at 3900 rpm	1995-1996	CNG
[\|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:

1992-1998 E36 318i
1994-1996 E34 518i
1995-1996 E34 518g Touring
1995-2001 Z3 1.8
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