# BMW M43

The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002. 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 (instead of the M40's finger rockers and timing belt). It also features a dual length intake manifold ("DISA"), to provide torque across a wider rev range.
In 1998 the displacement was increased to 1,895 cc (115.6 cu in), increasing torque to 180 N⋅m (133 lb⋅ft) at 3900 rpm.

## Versions

| Version | Displacement | Power | Torque | Year | Note |
| M43B16 | 1,596 cc (97.4 cu in) | 75 kW (101 hp) at 5500 rpm | 150 N⋅m (111 lb⋅ft) at 3900 rpm | 1991-1999 | |
| M43B16 | 1,596 cc (97.4 cu in) | 60 kW (80 hp) at 5500 rpm | 127 N⋅m (94 lb⋅ft) at 3900 rpm | 1995-2000 | CNG |
| M43B18 | 1,796 cc (109.6 cu in) | 85 kW (114 hp) at 5500 rpm | 168 N⋅m (124 lb⋅ft) at 3900 rpm | 1993 | |
| M43B18 | 1,796 cc (109.6 cu in) | 74 kW (99 hp) at 5500 rpm | 142 N⋅m (105 lb⋅ft) at 3900 rpm | 1995-1996 | CNG |
| M43B19 | 1,895 cc (115.6 cu in) | 87 kW (117 hp) at 5500 rpm | 180 N⋅m (133 lb⋅ft) at 3900 rpm | 1998 | |
| M43B19 | 1,895 cc (115.6 cu in) | 77 kW (103 hp) at 5300 rpm | 165 N⋅m (122 lb⋅ft) at 2500 rpm | 1999 | |

### M43B16

The 1,596 cc (97.4 cu in) M43B16 produces 75 kW (101 hp) and 150 N⋅m (111 lb⋅ft) 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 1,796 cc (109.6 cu in) displacement. It produces 85 kW (114 hp) and 124 lb⋅ft (168 N⋅m) and uses the Bosch Motronic 1.7.1 fuel injection system. There was also a less powerful natural gas-powered version of this car (also able to run on petrol) for the BMW 518g Touring (E34). 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 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 1,895 cc (115.6 cu in). It produces up to 87 kW (117 hp) and 180 N⋅m (133 lb⋅ft), and uses BMW's BMS 46 engine management system. The 77 kW (105 PS) 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 (118 PS version) all have the same camshaft.
Applications— 77 kW (103 hp) and 165 N⋅m (122 lb⋅ft):
* 1999-2001 E36 316i Compact
* 1999-2002 E46 316i
Applications— 87 kW (117 hp) and 180 N⋅m (133 lb⋅ft):
* 1998-2001 E46 318i/318Ci
* 1999 -2002 Z3 1.9