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.
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.
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:
Engine Management Systems:
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 (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 "M43TÃÂ") 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 (118 PS version) all have the same camshaft.
Applicationsâ and :
Applicationsâ and :