BMW N40

Reciprocating internal combustion engine

BMW N40 engine
Overview
Production	2001–2004
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 material	Aluminium
Cylinder head material	Aluminium
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.^[1] 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

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

Version	Displacement	Power	Torque	Years
N40B16	1,596 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:^[2]

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

References

^ Lewin, Tony (2004). The Complete Book of BMW: Every Model in the World Since 1962. MotorBooks International. pp. 258–259. ISBN 9781610592055.
^ "3'E46 316i model selection". www.realoem.com. Retrieved 12 March 2017.