M43 Engine

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.

M43B16

A 1.6 L (1596cm³) M43B16 produces 75 kW (102 hp) and 150 N·m with Bosch M1.7.1 fuel injection.

Applications:

• 1998-06 - 2002-02 E46 316i Sedan
• 1999-04 - 2002-02 E46 316i Coupe

M43B19

The 1.9 L (1895cm³) M43B19 was the largest M43 engine. It produced 87 kW (118 hp) and 180 N·m or 77 kW (105 hp) and 165 Nm. It used BMS 46 fuel injection.

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

Applications:

• 77 kW (105 hp) and 165 Nm
  • 1998-2001 E46 316i
• 87 kW (118 hp) and 180 Nm
  • 1998-2001 E46 318i/318Ci