BMW M43

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BMW M43 engine
BMW M43 Engine 316i Compact 1996.jpg
Overview
Production1991–2002
Layout
ConfigurationInline-4
Displacement1.6–1.9 L (98–116 cu in)
Block materialCast iron
Head materialAluminium
ValvetrainSOHC
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M40
SuccessorBMW N42

The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002.[1] The M43 powered base-model cars, while higher performance models at the time were powered by the BMW M42 and BMW M44 DOHC engines. The M43 was produced at the Steyr engine plant.[2]

A version using natural-gas was produced for the E36 318i and the E34 518i.

Following the introduction of the BMW N42 engine in 2001, the M43 began to be phased out.

Design[edit]

Compared with its BMW M40 predecessor, the features a knock sensor[3] and a timing chain (instead of the M40's timing belt).[4][5] It also features a dual length intake manifold[6] ("DISA"), to provide torque across a wider rev range.[7]

In 1998 the displacement was increased to 1,895 cc (115.6 cu in), increasing torque to 180 N⋅m (133 lb⋅ft) at 3900 rpm.[1]

Versions[edit]

Version Displacement Power Torque Year
M43B16 1,596 cc (97.4 cu in) 75 kW (101 bhp)
at 5,500 rpm
150 N⋅m (111 lb⋅ft)
at 3,900 rpm
1991
M43B18 1,796 cc (109.6 cu in) 85 kW (114 bhp)
at 5,500 rpm
168 N⋅m (124 lb⋅ft)
at 3,900 rpm
1993
M43B19 1,895 cc (115.6 cu in) 87 kW (117 bhp)
at 5,500 rpm
180 N⋅m (133 lb⋅ft)
at 3,900 rpm
1998
77 kW (103 bhp)
at 5,300 rpm
165 N⋅m (122 lb⋅ft)
at 2,500 rpm
1999

M43B16[edit]

The 1,596 cc (97.4 cu in) M43B16 produces 76 kW (102 bhp) and 150 N⋅m (111 lb⋅ft) of torque. It uses the Bosch Motronic 1.7.1 engine management system.[8]

Applications:

  • 1993-1999 E36 316i
  • 1998-2001 E46 316i

M43B18[edit]

The M43B18 has a 1,796 cc (109.6 cu in) displacement. It produces 86 kW (115 bhp) and 124 lb⋅ft (168 N⋅m) and uses the Bosch Motronic 1.7.1 fuel injection system.[8]

Applications:

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

M43B19[edit]

The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 1,895 cc (115.6 cu in). It produces up to 87 kW (117 bhp) and 180 N⋅m (133 lb⋅ft), and uses BMW's BMS 46 engine management system.[8] The 77 kW (103 bhp) versions do not have the DISA intake manifold.

Applications— 77 kW (103 bhp) and 165 N⋅m (122 lb⋅ft):

  • 1999-2001 E36 316i
  • 1999-2001 E46 316i

Applications— 87 kW (117 bhp) and 180 N⋅m (133 lb⋅ft):

  • 1998-2001 E46 318i/318Ci
  • 2001-2003 Z3 1.9

References[edit]

  1. ^ a b "Engine specifications for M43 engines". www.bmwheaven.com. Retrieved 3 March 2017.
  2. ^ "BMW M43 engine". www.australiancar.reviews. Retrieved 2 March 2017.
  3. ^ "Motorenkunde über BMW Motoren". www.bmw-syndikat.de (in German). Retrieved 2 March 2017.
  4. ^ "Timing and valve train-timing chain". www.bmwfans.info. Retrieved 3 March 2017.
  5. ^ "Timing and valve train-tooth belt". www.bmwfans.info. Retrieved 3 March 2017.
  6. ^ "BMW M40 and M43 Four Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 3 March 2017.
  7. ^ "What is a DISA valve?". www.bimmerforums.com. Retrieved 24 February 2017.
  8. ^ a b c "BMW World - 4-Cylinder Engines". www.usautoparts.net. Archived from the original on 2 March 2014.

See also[edit]