| BMW M43 engine | |
| Production: | 1991 - 2002 |
| Configuration: | Inline-4 |
| Block: | Cast iron |
| Head: | Aluminium |
| Valvetrain: | SOHC |
| Fueltype: | Petrol, CNG |
| Displacement: | 1596cc 1796cc 1895cc |
| Bore: | 842NaN2 852NaN2 |
| Stroke: | 722NaN2 812NaN2 83.52NaN2 |
| Predecessor: | BMW M40 |
| Successor: | BMW N42 |
The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002.[1] 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.[2]
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.
Compared with its BMW M40 predecessor, the M43 features both a camshaft position sensor and a 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 features a dual length intake manifold[6] ("DISA"), to provide torque across a wider rev range.[7]
In 1998 the displacement was increased to 18951NaN1, increasing torque to 1800NaN0 at 3900 rpm.
| Version | Displacement | Power | Torque | Year | Note |
|---|---|---|---|---|---|
| M43B16 | 15961NaN1 | 75kW at 5500 rpm | 1500NaN0 at 3900 rpm | 1991-1999 | |
| 60kW at 5500 rpm | 1270NaN0 at 3900 rpm | 1995-2000 | CNG | ||
| M43B18 | 17961NaN1 | 85kW at 5500 rpm | 1680NaN0 at 3900 rpm | 1993 | |
| 74kW at 5500 rpm | 1420NaN0 at 3900 rpm | 1995-1996 | CNG | ||
| M43B19 | 18951NaN1 | 87kW at 5500 rpm | 1800NaN0 at 3900 rpm | 1998 | |
| 77kW at 5300 rpm | 1650NaN0 at 2500 rpm | 1999 |
The 15961NaN1 M43B16 produces 75kW and 1500NaN0 of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system.[8] There was also a natural gas-powered version of this car (also able to run on petrol) for the 1995 BMW 316g Compact.
Applications:
Engine Management Systems:
The M43B18 has a 17961NaN1 displacement. It produces 85kW and 168Nm 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:
The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 18951NaN1. It produces up to 87kW and 1800NaN0, and uses BMW's BMS 46 engine management system. The 105PS 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— 77kW and 1650NaN0:
Applications— 87kW and 1800NaN0: