BMW N42

The BMW N42 is a DOHC four-cylinder petrol engine which replaced the BMW M43 and was produced from 2001-2004.[1][2]

BMW N42 engine
Overview
Production2001–2004
Layout
ConfigurationInline-4
Displacement1.8–2.0 L (110–122 cu in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC, with VVT & VVL
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M43
SuccessorBMW N46

The N42 serves as the basis for the smaller N40 engine (which does not have valvetronic).

The N42B18 won the 1.4-1.8 L category of the International Engine of the Year awards for 2001.[3]

In 2004, the N42 was replaced by the BMW N46 four-cylinder engine.

Design

Compared with its M43 predecessor, the N42 features a DOHC valvetrain, VANOS (variable valve timing) and an aluminium engine block.[4] It was the first BMW engine to have Valvetronic (variable valve lift).[5][6]

Versions
VersionDisplacementPowerTorqueYear
N42B181,796 cc (109.6 cu in)85 kW (114 bhp)
at 5,500 rpm		175 N⋅m (129 lb⋅ft)
at 3,750 rpm		2001-2004
N42B201,995 cc (121.7 cu in)105 kW (141 bhp)
at 6,000 rpm		200 N⋅m (148 lb⋅ft)
at 3,750 rpm		2001-2004

N42B18

The N42B18 has a displacement of 1,796 cc (109.6 cu in),[1] uses Bosch Motroinc ME9.2 engine management[7] and has twin-balancing shafts.

Applications:

  • 2001-2004 E46 316i and 316ti

N42B20

The N42B20 has a displacement of 1,995 cc (121.7 cu in),[1] uses Bosch DME ME9.2 fuel injection and has twin-balancing shafts.

Applications:

  • 2001-2004 E46 318i/318Ci/318ti
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See also

References
  1. "Engine specifications for N42 engines". www.bmwheaven.com. Retrieved 2012-06-03.
  2. "3'E46 318ci model selection". www.realoem.com. Retrieved 16 March 2017.
  3. "Archive". www.ukimediaevents.com. Retrieved 22 March 2017.
  4. "BMW N42B20 Engine". www.mywikimotors.com. Archived from the original on 2 October 2017. Retrieved 1 October 2017.
  5. "BMW N42 Four Cylinder Valvetronic Engine". www.unixnerd.demon.co.uk. Retrieved 22 March 2017.
  6. "Valve timing gear, cntrl unit Valvetronic BMW 3' E46, 318Ci (N42) — BMW parts catalog". www.bmwfans.info. Retrieved 3 June 2012.
  7. "BMW 3 2006 / E46". www.obdtester.com. Retrieved 22 March 2017.


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