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Automotive industryBMW
PredecessorBMW M40
SuccessorBMW N42
Car classificationSOHC Straight-4
Internal combustion engine1.6 L (1596 cc/97 in³)
1.8 L (1796 cc/109 in³)
1.9 L (1895 cc/115 in³)
RelatedBMW M44

The BMW M43 is a Straight-4 Piston engine. Displacement ranges from 1600 cc to 2000 cc.

The engine was built solely on Assembly Line 2 at Steyr, and was the successor to the M40.

It features ICIM (Individual Control Intake Manifold) and 2-valve technology. The ICIM optimizes the torque curve and is also aided by anti-knock control. Like the 16-valve, 4-cylinder M42 engine and the 6 and 8-cylinder engines, stationary high-voltage distribution is also used on the M43. The M40's timing belt was replaced by a chain as the high engine bay temperatures reduced the lifespan of the belt. Engine ratings were slightly raised while exhaust levels and fuel efficiency were significantly improved.

A further technical revision occurred in 1998. The displacement capacity was increased to 1.9 litres, resulting in improved torque of 180 Nm at 3900 rpm. The intake manifold was also constructed of plastic for added weight savings.

From 1993 to 2001 a total of 1,204,734 units came off the production line, making this the Steyr plant's highest-production engine.

M43B161.6 L (1596 cc/97 in³)75 kW (101 hp) @ 5500150 N·m (111 ft·lbf) @ 390062001991
M43B181.8 L (1796 cc/109 in³)85 kW (114 hp) @ 5500168 N·m (124 ft·lbf) @ 390062001993
M43TUB191.9 L (1895 cc/115 in³)87 kW (117 hp) @ 5500180 N·m (133 ft·lbf) @ 390062001998
77 kW (103 hp) @ 5300165 N·m (122 ft·lbf) @ 250062001999


A 1.6 L (1596cc) M43B16 produces 75 kW (102 hp) and 150 N·m (111 ft·lbf) with Robert Bosch GmbH M1.7.1 Fuel injection.



The M43B18 was a 1.8 L (1796cc) version. It produced 85 kW (115 hp) and 168 N·m (124 ft·lbf) with Robert Bosch GmbH M1.7.1 Fuel injection.



The 1.9 L (1895cc) M43B19 was the largest M43 engine. It produced 87 kW (117 hp) and 180 N·m (133 ft·lbf) or 77 kW (103 hp) and 165 N·m (122 ft·lbf). It used BMW BMS 46 Fuel injection.

It's also known as M43 TÜ engine. It had twin-balancing shafts.


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