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]
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]
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 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
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.
