BMW M43

BMW M43
Overview
Manufacturer	BMW
Production	1991–2002
Combustion chamber
Configuration	SOHC Straight-4
Chronology
Predecessor	BMW M40
Successor	BMW N42

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.^[1] 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).^[2][3]

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.^[1]

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.^[4]

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.^[4]

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.^[4]

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)
  • 1999-2001 E36 316i compact
  • 1999-2004 E46 316i

References

1. http://www.bmwheaven.com/database/engine.php?type=M43
2. http://bmwfans.info/parts/catalog/E36/Coupe/Europe/316i-M43/browse/engine/timing_and_valve_train_timing_chain/
3. http://bmwfans.info/parts/catalog/E36/Sedan/Europe/316i-M40/browse/engine/timing_and_valve_train_tooth_belt/
4. http://www.usautoparts.net/bmw/engines/4cyl.htm

External links

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