BMW M43

File:BMW M43 Engine 316i Compact 1996.jpg

BMW M43B16 in a 316i Compact

The BMW M43 is a straight-4 SOHC piston engine which replaced the M40 and was produced from 1991-2002. Displacement ranges from 1.6 L to 2.0 L. The M43 powered base-model cars, while higher performance models at the time were powered by the DOHC M42 or M44.

Compared with its M40 predecessor, it features a dual-path intake manifold (called Individual Control Intake Manifold by BMW) to provide torque across a wider rev range, knock sensing and a timing chain (instead of the M40's timing belt).

The engine was built solely on Assembly Line 2 at Steyr. A total of 1,204,734 units came off the production line, making this the Steyr plant's highest-production engine.

In 1998 the displacement was increased to 1.9 litres, increasing torque to 180 Nm at 3900 rpm.

Models

Engine	Displacement	Power	Torque	Redline	Year
M43B16	1596 cc	75 kW (101 hp) @ 5500	150 N·m (111 lb·ft) @ 3900	6200	1991
M43B18	1796 cc	85 kW (115 hp) @ 5500	168 N·m (124 lb·ft) @ 3900	6200	1993
M43B19	1895 cc	87 kW (118 hp) @ 5500	180 N·m (133 lb·ft) @ 3900	6200	1998
		77 kW (105 hp) @ 5300	165 N·m (122 lb·ft) @ 2500	6200	1999

M43B16

The 1.6 L (1596cc) M43B16 produces 102 hp and 150 Nm. It uses the Bosch Motronic 1.7.1 fuel injection system.

Applications:

• 1993-1999 E36 316i
• 1994-1998 E36 316i Compact
• 1998-2002 E46 316i

M43B18

The M43B18 has a 1796 cc displacement. It produces 115 hp and 168 Nm and uses the Bosch Motronic 1.7.1 fuel injection system.

Applications:

• 1992-1998 E36 318i
• 1994-1996 E34 518i
• 1995-2001 E36 Z3 1.8

M43B19

The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 1895 cc. It produces up to 118 hp and 180 Nm and uses BMW BMS 46 fuel injection system.

Applications:

• 87 kW (118 hp) and 180 N·m (133 lb·ft)
  • 1998-2001 E46 318i/318Ci
  • 2001-2003 BMW E36 Z3 1.9
• 77 kW (105 hp) and 165 N·m (122 lb·ft)
  • 1994-1995 E36 316i compact
  • 1998-2001 E46 316i

External links

• The UnixNerd's BMW M43 engine page with photos, history and common problems.