BMW N42

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).

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 revs to 6600 rpm

Applications:
 * 2001-2004 E46 318i/318Ci/318ti