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BMW M43

FieldValue
nameBMW M43 engine
imageBMW M43 Engine 316i Compact 1996.jpg
production1991–2002
configurationInline-4
blockCast iron
headAluminium
valvetrainSOHC
fueltypePetrol, CNG
displacement1596 cc
1796 cc
1895 cc
bore84 mm
85 mm
stroke72 mm
81 mm
83.5 mm
predecessorBMW M40
successorBMW N42

1796 cc 1895 cc 85 mm 81 mm 83.5 mm

The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991 to 2002. 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.

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

Compared with its BMW M40 predecessor, the M43 features both a camshaft position sensor and a knock sensor as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt). It also features a dual length intake manifold ("DISA"), to provide torque across a wider rev range.

In 1998 the displacement was increased to 1895 cc, increasing torque to 180 Nm at 3900 rpm.

Versions

VersionDisplacementPowerTorqueYearNote
M43B161596 cc75 kW
at 5500 rpm150 Nm
at 3900 rpm1991-1999
60 kW
at 5500 rpm127 Nm
at 3900 rpm1995-2000CNG
M43B181796 cc85 kW
at 5500 rpm168 Nm
at 3900 rpm1993
74 kW
at 5500 rpm142 Nm
at 3900 rpm1995-1996CNG
M43B191895 cc87 kW
at 5500 rpm180 Nm
at 3900 rpm1998
77 kW
at 5300 rpm165 Nm
at 2500 rpm1999

M43B16

The 1596 cc M43B16 produces 75 kW and 150 Nm of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system. There was also a natural gas-powered version of this car (also able to run on petrol) for the 1995 BMW 316g Compact.

Applications:

  • 1994-1998 E36 316i
  • 1995-2000 E36/5 316g Compact
  • 1998-1999 E46 316i

Engine Management Systems:

  • 1993-09/1995 Bosch Motronic 1.7.2
  • 1995-09/1997 Bosch Motronic 1.7.3
  • 1997-2000 BMS43

M43B18

The M43B18 has a 1796 cc displacement. It produces 85 kW and 168 Nm and uses the Bosch Motronic 1.7.1 fuel injection system. There was also a less powerful natural gas-powered version of this car (also able to run on petrol) for the BMW 518g Touring (E34). This model was only available for two years.

Applications:

  • 1992-1998 E36 318i
  • 1994-1996 E34 518i
  • 1995-1996 E34 518g Touring
  • 1995-2001 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 87 kW and 180 Nm, and uses BMW's BMS 46 engine management system. The 105 PS versions do not have the DISA intake manifold and also have a smaller camshaft compared to the 118 PS versions. Note the M43B16, M43B18 and the M43B19 (118 PS version) all have the same camshaft.

Applications— 77 kW and 165 Nm:

  • 1999-2001 E36 316i Compact
  • 1999-2002 E46 316i

Applications— 87 kW and 180 Nm:

  • 1998-2001 E46 318i/318Ci
  • 1999 -2002 Z3 1.9

References

References

  1. "Engine specifications for M43 engines".
  2. "BMW M43 engine".
  3. "Motorenkunde über BMW Motoren".
  4. "Timing and valve train-timing chain".
  5. "Timing and valve train-tooth belt".
  6. "BMW M40 and M43 Four Cylinder Engines".
  7. "What is a DISA valve?".
  8. "BMW World - 4-Cylinder Engines".
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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