{{Infobox automobile engine | name = BMW M43 engine | image = BMW M43 Engine 316i Compact 1996.jpg | production = 1991–2002 | configuration = Inline-4 | block = Cast iron | head = Aluminium | valvetrain = SOHC, 8V | fueltype = Petrol, CNG | displacement = {{convert|1596|cc|L|1|order=flip|abbr=on}}<br/>{{convert|1796|cc|L|1|order=flip|abbr=on}}<br/>{{convert|1895|cc|L|1|order=flip|abbr=on}} | bore = {{convert|84|mm|in|2|abbr=on}}<br/>{{convert|85|mm|in|2|abbr=on}} | stroke = {{convert|72|mm|in|2|abbr=on}}<br/>{{convert|81|mm|in|2|abbr=on}}<br/>{{convert|83.5|mm|in|2|abbr=on}} | predecessor = BMW M40 | successor = BMW N42 | manufacturer = }}
The BMW '''M43''' is an single overhead camshaft [https://www.bmw-carparts.co.uk/product?pid=BMW+E36+E46+E34+3+5+SERIES+M43+Pressure+Tested+Cylinder+Head&sku=65700 eight valve] four-cylinder petrol engine which was produced from 1991 to 2002.<ref name="bmwhaven">{{cite web|title=Engine specifications for M43 engines|url=http://www.bmwheaven.com/database/engine.php?type=M43|website=www.bmwheaven.com|accessdate=3 March 2017}}</ref> The M43 was used in lower powered models, while higher power models had the BMW M42 and later BMW M44 both sixteen valve DOHC engines. The M43 was produced at the Steyr engine plant.<ref>{{cite web|title=BMW M43 engine|url=http://australiancar.reviews/bmw_M43.php|website=www.australiancar.reviews|accessdate=2 March 2017|archive-date=23 June 2015|archive-url=https://web.archive.org/web/20150623044118/http://australiancar.reviews/bmw_M43.php|url-status=dead}}</ref>
A version using natural gas was produced for the E36 318i and the E34 518i.
Following the introduction of the BMW N42 and the lower powered N40 engine in 2001, the M43 began to be phased out.
== Design == Compared with the BMW M40 predecessor, the M43 features camshaft position sensor and knock sensor<ref>{{cite web|title=Motorenkunde über BMW Motoren|url=https://www.bmw-syndikat.de/bmw-syndikat/archiv/bmw_motorenkunde/|website=www.bmw-syndikat.de|accessdate=2 March 2017|language=German}}</ref> as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt).<ref>{{cite web|title=Timing and valve train-timing chain|url=http://bmwfans.info/parts-catalog/E36-Coupe/Europe/316i-M43/browse/engine/timing_and_valve_train_timing_chain|website=www.bmwfans.info|accessdate=3 March 2017|language=en-us}}</ref><ref>{{cite web|title=Timing and valve train-tooth belt|url=http://bmwfans.info/parts/catalog/E36/Sedan/Europe/316i-M40/browse/engine/timing_and_valve_train_tooth_belt/|website=www.bmwfans.info|accessdate=3 March 2017|language=en-us}}</ref> It also introduced a dual length intake manifold<ref>{{cite web|title=BMW M40 and M43 Four Cylinder Engines|url=http://www.unixnerd.demon.co.uk/m40.html|website=www.unixnerd.demon.co.uk|accessdate=3 March 2017|archive-date=28 September 2015|archive-url=https://web.archive.org/web/20150928214048/http://www.unixnerd.demon.co.uk/m40.html|url-status=dead}}</ref> ("DISA"), to provide torque across a wider rev range.<ref>{{cite web|title=What is a DISA valve?|url=https://www.bimmerforums.com/forum/showthread.php?737823-What-is-a-DISA-valve|website=www.bimmerforums.com|accessdate=24 February 2017}}</ref>
== Versions ==
{|class="wikitable sortable" style="text-align: center;" |- style="vertical-align:middle;" ! Version !!Displacement!!Power!!Torque!!Year!!Note |- |rowspan=2|M43B16||rowspan=2|{{convert|1596|cc|cuin|1|abbr=on}}||{{convert|75|kW|0|abbr=on}} <br/> at 5500 rpm||{{convert|150|Nm|lbft|0|abbr=on}} <br/> at 3900 rpm||1991-1999|| |- |{{convert|60|kW|0|abbr=on}} <br/> at 5500 rpm||{{convert|127|Nm|lbft|0|abbr=on}} <br/> at 3900 rpm||1995-2000||CNG |- |rowspan=2|M43B18||rowspan=2|{{convert|1796|cc|cuin|1|abbr=on}}||{{convert|85|kW|0|abbr=on}} <br/> at 5500 rpm||{{convert|168|Nm|lbft|0|abbr=on}} <br/> at 3900 rpm||1993|| |- |{{convert|74|kW|0|abbr=on}} <br/> at 5500 rpm||{{convert|142|Nm|lbft|0|abbr=on}} <br/> at 3900 rpm||1995-1996||CNG |- |rowspan=2|M43B19||rowspan=2|{{convert|1895|cc|cuin|1|abbr=on}}||{{convert|87|kW|0|abbr=on}} <br/> at 5500 rpm||{{convert|180|Nm|lbft|0|abbr=on}} <br/> at 3900 rpm||1998|| |- |{{convert|77|kW|0|abbr=on}} <br/> at 5300 rpm||{{convert|165|Nm|lbft|0|abbr=on}} <br/> at 2500 rpm||1999|| |}
=== M43B16 === The {{convert|1596|cc|cuin|1|abbr=on}} M43B16 produces {{convert|75|kW|0|abbr=on}} and {{convert|150|Nm|lbft|0|abbr=on}} of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system.<ref name="usautoparts">{{cite web|title=BMW World - 4-Cylinder Engines |url=http://www.usautoparts.net/bmw/engines/4cyl.htm |website=www.usautoparts.net |archiveurl=https://web.archive.org/web/20140302135705/http://www.usautoparts.net/bmw/engines/4cyl.htm |archivedate=2 March 2014 |url-status=dead }}</ref> There was also a natural gas-powered version of this car (also able to run on petrol) for the 1995 BMW 316g Compact.
Applications: * 1994-1998 E36 316i * 1995-2000 E36/5 316g Compact * 1998-1999 E46 316i
Engine Management Systems: * 1993-09/1995 Bosch Motronic 1.7.2 * 1995-09/1997 Bosch Motronic 1.7.3 * 1997-2000 BMS43
=== M43B18 === The M43B18 has a {{convert|1796|cc|cuin|1|abbr=on}} displacement. It produces {{convert|85|kW|0|abbr=on}} and {{convert|168|Nm|lbft|0|abbr=on|order=flip}} and uses the Bosch Motronic 1.7.1 fuel injection system.<ref name="usautoparts" /> There was also a less powerful natural gas-powered version of this car (also able to run on petrol) for the BMW 518g Touring (E34). This model was only available for two years.
Applications: * 1992-1998 E36 318i * 1994-1996 E34 518i * 1995-1996 E34 518g Touring * 1995-2001 Z3 1.8
=== M43B19 === The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of {{convert|1895|cc|cuin|1|abbr=on}}. It produces up to {{convert|87|kW|0|abbr=on}} and {{convert|180|Nm|lbft|0|abbr=on}}, and uses BMW's BMS 46 engine management system.<ref name="usautoparts" /> The {{convert|105|PS|kW|0|abbr=on|disp=flip}} versions do not have the DISA intake manifold and also have a smaller camshaft compared to the 118 PS versions. Note the M43B16, M43B18 and the M43B19 (118 PS version) all have the same camshaft.
Applications— {{convert|77|kW|0|abbr=on}} and {{convert|165|Nm|lbft|0|abbr=on}}: * 1999-2001 E36 316i Compact * 1999-2002 E46 316i
Applications— {{convert|87|kW|0|abbr=on}} and {{convert|180|Nm|lbft|0|abbr=on}}: * 1998-2001 E46 318i/318Ci * 1999 -2002 Z3 1.9
== References == {{reflist|30em}}
== See also == *List of BMW engines
{{BMW automotive petrol engines: 1980s to 2000s}}
{{DEFAULTSORT:Bmw M43}} M43 Category:Straight-four engines Category:Gasoline engines by model Category:1990s automobile engines