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BMW N42

BMW N42
FieldValue
nameBMW N42 engine
production2001–2004
configurationInline-4
headAluminium
blockAluminium
valvetrainDOHC, with VVT & VVL
fueltypePetrol
displacement{{ubl
bore84 mm
stroke{{ubl
{{convert81mmin2abbron}}
{{convert90mmin2abbron}}
predecessorBMW M43
successorBMW N46

| 1796 cc | 1995 cc | 81 mm | 90 mm The BMW N42 is a DOHC four-cylinder petrol engine which replaced the BMW M43 and was produced from 2001-2004.

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.

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. It was the first BMW engine to have Valvetronic (variable valve lift).

Versions

VersionDisplacementPowerTorqueYear
N42B181796 cc85 kW
at 5,500 rpm175 Nm
at 3,750 rpm2001-2004
N42B201995 cc105 kW
at 6,000 rpm200 Nm
at 3,750 rpm2001-2004

N42B18

The N42B18 has a displacement of 1796 cc, uses Bosch Motronic ME9.2 engine management and

Applications:

  • 2001-2004 E46 316i and 316ti

N42B20

The N42B20 has a displacement of 1995 cc, The N42B20 redlines at 6,600 rpm.

The N42B20 replaced older engines like the M43TU and M44B19, and was succeeded by the N46 and N45 series.

Key Technologies:

  • Double VANOS: Adjusts both intake and exhaust camshaft timing for better torque and efficiency across engine speeds.
  • Valvetronic: BMW's variable valve lift system, which eliminates the need for a traditional throttle body and improves fuel economy.
  • DISA Manifold: A variable-length intake system that optimizes airflow for low-end torque and high-end power.
  • Aluminum Block: Lighter than its cast-iron predecessors, improving weight distribution and fuel economy.

Applications:

  • 2001-2004 E46 318i/318Ci/318ti

{{Anchor|BMW N40}}N40

Design

BMW E46/5 316ti

The N40 is based on the BMW N42 engine and uses the same crankcase, pistons and bore size of 84 mm. The redline is 6,500 rpm.

Unlike the N42, the N40 does not have Valvetronic (variable valve lift). The other major difference is a 9 mm reduction in stroke to 72.0 mm, which results in a smaller displacement than the N42.

Versions

VersionDisplacementPowerTorqueYears
N40B161596 cc85 kW
at 6,100 rpm150 Nm
at 4,300 rpm2001–2004

Applications:

  • 2001-2005 E46 316i/316ci/316ti (certain markets only)

References

References

  1. "Engine specifications for N42 engines".
  2. "3'E46 318ci model selection".
  3. "Archive".
  4. "BMW N42B20 Engine".
  5. "BMW N42 Four Cylinder Valvetronic Engine".
  6. "Valve timing gear, cntrl unit Valvetronic BMW 3' E46, 318Ci (N42) — BMW parts catalog".
  7. "BMW 3 2006 / E46".
  8. Lewin, Tony. (2004). "The Complete Book of BMW: Every Model in the World Since 1962". [[MotorBooks International]].
  9. "3'E46 316i model selection".
Info: Wikipedia Source

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