BMW N42#N42B20
{{Infobox automobile engine
|name=BMW N42 engine
|production=2001–2004
|configuration =Inline-4
|head =Aluminium
|block =Aluminium
|valvetrain =DOHC, with VVT & VVL
|fueltype=Petrol
|displacement={{ubl
| {{cvt|1796|cc|L|1}}
| {{cvt|1995|cc|L|1}}
}}
| bore = {{convert|84|mm|in|2|abbr=on}}
| stroke = {{ubl
| {{convert|81|mm|in|2|abbr=on}}
| {{convert|90|mm|in|2|abbr=on}}
}}
|predecessor=BMW M43
|successor=BMW N46
}}
The BMW N42 is a DOHC four-cylinder petrol engine which replaced the BMW M43 and was produced from 2001-2004.{{cite web|url=http://www.bmwheaven.com/database/engine.php?type=N42 |title=Engine specifications for N42 engines |website=www.bmwheaven.com |date= |accessdate=2012-06-03}}{{cite web|title=3'E46 318ci model selection|url=http://www.realoem.com/bmw/enUS/select?product=P&archive=0&series=E46&body=Cab&model=318Ci&market=EUR&prod=20040200|website=www.realoem.com|accessdate=16 March 2017}}
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.{{cite web|title=Archive|url=http://www.ukimediaevents.com/engineoftheyear/archive.php|website=www.ukimediaevents.com|accessdate=22 March 2017}}
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.{{cite web|title=BMW N42B20 Engine|url=https://mywikimotors.com/n42b20/|website=www.mywikimotors.com|accessdate=1 October 2017|archive-url=https://web.archive.org/web/20171002232346/http://mywikimotors.com/n42b20/|archive-date=2 October 2017|url-status=dead}} It was the first BMW engine to have Valvetronic (variable valve lift).{{cite web|title=BMW N42 Four Cylinder Valvetronic Engine|url=http://www.unixnerd.demon.co.uk/n42.html|website=www.unixnerd.demon.co.uk|accessdate=22 March 2017|archive-date=7 February 2020|archive-url=https://web.archive.org/web/20200207170317/http://www.unixnerd.demon.co.uk/n42.html|url-status=dead}}{{cite web|url=http://bmwfans.info/parts/catalog/E46/Coupe/Europe/318Ci-N42/browse/engine/valve_timing_gear_cntrl_unit_valvetronic/ |title=Valve timing gear, cntrl unit Valvetronic BMW 3' E46, 318Ci (N42) — BMW parts catalog |website=www.bmwfans.info |date= |accessdate=3 June 2012}}
Versions
| class=wikitable | ||||
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| N42B18 | {{convert|1796|cc|cuin|1|abbr=on}} | {{convert|85|kW|bhp|0|abbr=on}} at 5,500 rpm | {{convert|175|Nm|lbft|0|abbr=on}} at 3,750 rpm | 2001-2004 |
| N42B20 | {{convert|1995|cc|cuin|1|abbr=on}} | {{convert|105|kW|bhp|0|abbr=on}} at 6,000 rpm | {{convert|200|Nm|lbft|0|abbr=on}} at 3,750 rpm | 2001-2004 |
N42B18
The N42B18 has a displacement of {{convert|1796|cc|cuin|1|abbr=on}}, uses Bosch Motronic ME9.2 engine management{{cite web|title=BMW 3 2006 / E46|url=http://obdtester.com/bimcom-eculist/bmw/3/2006_e46|website=www.obdtester.com|accessdate=22 March 2017}} and {{citation needed span|text=has twin-balancing shafts.|date=June 2012}}
Applications:
- 2001-2004 E46 316i and 316ti
N42B20
The N42B20 has a displacement of {{convert|1995|cc|cuin|1|abbr=on}}, {{citation needed span|text=uses Bosch DME ME9.2 fuel injection and has twin-balancing shafts.|date=June 2012}}
The N42B20 revs to 6600 rpm
Applications:
- 2001-2004 E46 318i/318Ci/318ti
{{Anchor|BMW N40}}N40
{{Infobox automobile engine
| name = BMW N40 engine
| production = 2001–2004
| configuration = Inline-4
| displacement = {{convert|1596|cc|L|1|order=flip|abbr=on}}
| bore = {{convert|84|mm|in|2|abbr=on}}
| stroke = {{convert|72|mm|in|2|abbr=on}}
| block = Aluminium
| head = Aluminium
| fueltype = Petrol
| 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.{{cite book |last=Lewin |first=Tony |title=The Complete Book of BMW: Every Model in the World Since 1962 |publisher=MotorBooks International |year=2004 |isbn=9781610592055 |pages=258–259}} 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 =
File:BMW_E46_compact_front_20071104.jpg
The N40 is based on the BMW N42 engine and uses the same crankcase, pistons and bore size of {{convert|84|mm|in|1|abbr=on}}. The redline is 6,500 rpm.
Unlike the N42, the N40 does not have Valvetronic (variable valve lift). The other major difference is a {{convert|9|mm|in|1|abbr=on}} reduction in stroke to {{convert|72.0|mm|in|1|abbr=on}}, which results in a smaller displacement than the N42.
= Versions =
| class="wikitable" style="text-align: center;"
!Version !Displacement !Power !Torque !Years |
| N40B16
|{{convert|1596|cc|cuin|0|abbr=on}} |{{convert|85|kW|bhp|0|abbr=on}} at 6,100 rpm |{{convert|150|Nm|lbft|0|abbr=on}} at 4,300 rpm |2001–2004 |
- 2001-2005 E46 316i/316ci/316ti (certain markets only)