The BMW M43 is an single overhead camshaft eight valve four-cylinder petrol engine which was produced from 1991 to 2002. The M43 was used in lower powered models, while higher power models had the BMW M42 and later BMW M44 both sixteen valve 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 and the lower powered N40 engine in 2001, the M43 began to be phased out.
Design
Compared with the BMW M40 predecessor, the M43 features camshaft position sensor and knock sensor as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt). It also introduced a dual length intake manifold ("DISA"), to provide torque across a wider rev range.
Versions
{|class="wikitable sortable" style="text-align: center;"
|- style="vertical-align:middle;"
! Version !!Displacement!!Power!!Torque!!Year!!Note
|-
|rowspan=2|M43B16||rowspan=2||| <br/> at 5500 rpm|| <br/> at 3900 rpm||1991-1999||
|-
| <br/> at 5500 rpm|| <br/> at 3900 rpm||1995-2000||CNG
|-
|rowspan=2|M43B18||rowspan=2||| <br/> at 5500 rpm|| <br/> at 3900 rpm||1993||
|-
| <br/> at 5500 rpm|| <br/> at 3900 rpm||1995-1996||CNG
|-
|rowspan=2|M43B19||rowspan=2||| <br/> at 5500 rpm|| <br/> at 3900 rpm||1998||
|-
| <br/> at 5300 rpm|| <br/> 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 (also able to run on petrol) 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.