BMW M43
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1.8 L (1,796 cc)
1.9 L (1,895 cc)
85 mm (3.35 in)
| BMW M43 engine | |
|---|---|
 | |
| Overview | |
| Production | 1991–2002 |
| Layout | |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,596 cc) 1.8 L (1,796 cc) 1.9 L (1,895 cc) |
| Cylinder bore | 84 mm (3.31 in) 85 mm (3.35 in) |
| Piston stroke | 72 mm (2.83 in) 81 mm (3.19 in) 83.5 mm (3.29 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC, 8V |
| Combustion | |
| Fuel type | Petrol, CNG |
| Chronology | |
| Predecessor | BMW M40 |
| Successor | BMW N42 |
The BMW M43 is an single overhead camshaft eight valve four-cylinder petrol engine which was produced from 1991 to 2002.[1] 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.[2]
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.
Compared with the BMW M40 predecessor, the M43 features camshaft position sensor and knock sensor[3] as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt).[4][5] It also introduced a dual length intake manifold[6] ("DISA"), to provide torque across a wider rev range.[7]