BMW N40

The BMW N40 is a DOHC four-cylinder petrol engine which replaced the 1.6 litre versions of the BMW M43. 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. 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
Applications:
 * 2001-2005 E46 316i/316ci/316ti (certain markets only)