BMW N42

Last updated
BMW N42 engine
Overview
Production2001–2004
Layout
Configuration Inline-4
Displacement
  • 1,796 cc (1.8 L)
  • 1,995 cc (2.0 L)
Cylinder bore 84 mm (3.31 in)
Piston stroke
  • 81 mm (3.19 in)
  • 90 mm (3.54 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
Valvetrain DOHC, with VVT & VVL
Combustion
Fuel type Petrol
Chronology
Predecessor BMW M43
Successor BMW N46

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

Contents

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
N42B18 1,796 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
N42B20 1,995 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 Motronic ME9.2 engine management [7] and has twin-balancing shafts.[ citation needed ]

Applications:

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.[ citation needed ] The N42B20 revs to 6600 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 RPMs.

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:

N40

BMW N40 engine
Overview
Production2001–2004
Layout
Configuration Inline-4
Displacement 1.6 L (1,596 cc)
Cylinder bore 84 mm (3.31 in)
Piston stroke 72 mm (2.83 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
Valvetrain DOHC, with VVT
Combustion
Fuel type Petrol
Chronology
Predecessor BMW M43
Successor BMW N45

The BMW N40 is a DOHC four-cylinder petrol engine which replaced the 1.6 litre versions of the BMW M43. [8] It was produced from 2001-2004 and only sold in several countries, where taxes favoured cars with smaller displacement engines. The N40 was replaced by the BMW N45.

Design

BMW E46/5 316ti BMW E46 compact front 20071104.jpg
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 (3.3 in). 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 (0.4 in) reduction in stroke to 72.0 mm (2.8 in), which results in a smaller displacement than the N42.

Versions

VersionDisplacementPowerTorqueYears
N40B161,596 cc (97 cu in)85 kW (114 bhp)

at 6,100 rpm

150 N⋅m (111 lb⋅ft)

at 4,300 rpm

2001–2004

Applications: [9]

See also

References

  1. 1 2 3 "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. Archived from the original on 7 February 2020. 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.
  8. ↑ Lewin, Tony (2004). The Complete Book of BMW: Every Model in the World Since 1962. MotorBooks International. pp. 258–259. ISBN   9781610592055.
  9. ↑ "3'E46 316i model selection". www.realoem.com. Retrieved 12 March 2017.
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