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BMW M40

FieldValue
nameBMW M40 engine
manufacturerBMW
production1987–1994
configurationNaturally aspirated straight-4
displacement
bore84 mm
stroke72 mm
81 mm
predecessorBMW M10
successorBMW M43
valvetrainSOHC
fueltypePetrol
fuelsystemFuel injection
coolingsystemWater cooled
imageM40B16.JPG
managementBosch Motronic 1.3 or 1.7
blockCast iron
headAluminium

81 mm

The BMW M40 is an SOHC straight-four petrol engine which was produced from 1987–1994. It served as BMW's base model four-cylinder engine and was produced alongside the higher performance BMW M42 DOHC four-cylinder engine from 1989 onwards.

Compared with its M10 predecessor, the M40 uses a belt-driven camshaft, and hydraulic tappets. Like the M10, the M40 uses an iron block and an aluminium head. Fuel injection for the E30 versions is Bosch Motronic 1.3, and the E36 versions use Bosch Motronic 1.7.

Following the introduction of the BMW M43 engine in 1991, the M40 began to be phased out.

Versions

VersionDisplacementPowerTorqueYear
M40B16-
E30 version1596 cc73 kW
at 5,500 rpm141 Nm
at 4,250 rpm1987
M40B16-
E36 version75 kW
at 5,500 rpm143 Nm
at 4,250 rpm1991
M40B18-
E30 version1796 cc83 kW
at 5,500 rpm162 Nm
at 4,250 rpm1987
M40B18-
E36 version85 kW
at 5,500 rpm165 Nm
at 4,250 rpm1991

M40B16

The M40B16 is a 1596 cc version of the M40, which has a bore of 84 mm and a stroke of 72 mm. It produces 73 kW and 105 lbft.

Applications:

  • 1988–1994 316i (E30)
  • 1990–1994 316i (E36)
  • 1992–1993 Bertone Freeclimber 2

M40B18

The M40B18 is a 1796 cc version of the M40, which has a bore of 84 mm and a stroke of 81 mm. It produces 83 kW and 120 lbft.

Applications:

  • 1987–1994 318i (E30)
  • 1992–1993 318i (E36)
  • 1989-1994 518i (E34)

References

References

  1. "BMW M40B18 automotive engine".
  2. "BMW M40B16 automotive engine".
  3. "M40 - E30 Zone Wiki".
  4. "3' E30 318i Uncoded DME control unit".
  5. (27 October 1975). "3' E36 318i Uncoded DME control unit".
  6. Roy McNeill, Copyright BMW World 1999–2005. "BMW World – 4-Cylinder Engines". Usautoparts.net.
  7. "BMW M40 and M43 Four Cylinder Engines".
  8. "BMW Heaven Specification Database | Engine specifications for M40 engines".
Info: Wikipedia Source

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bmw-engines straight-four-engines gasoline-engines-by-model
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