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).

Versions

{| class=wikitable

|-

! Version !!Displacement!!Power!!Torque!!Year

|-

|N42B18|||| <br/> at 5,500&nbsp;rpm|| <br/> at 3,750&nbsp;rpm||2001-2004

|-

|N42B20|||| <br/> at 6,000&nbsp;rpm|| <br/> at 3,750&nbsp;rpm||2001-2004

|}

N42B18

The N42B18 has a displacement of , and

Applications:

  • 2001-2004 E46 316i and 316ti

N42B20

The N42B20 has a displacement of , 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

right|thumb|BMW E46/5 316ti

The N40 is based on the BMW N42 engine and uses the same crankcase, pistons and bore size of . The redline is 6,500&nbsp;rpm.

Unlike the N42, the N40 does not have Valvetronic (variable valve lift). The other major difference is a reduction in stroke to , which results in a smaller displacement than the N42.

Versions

{| class="wikitable" style="text-align: center;"

!Version

!Displacement

!Power

!Torque

!Years

|-

|N40B16

|

|<br>at 6,100 rpm

|<br>at 4,300 rpm

|2001–2004

|}

Applications:

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

See also

  • BMW
  • List of BMW engines

References