BMW M44#M44B19
{{Infobox automobile engine
|name = BMW M44 engine
|image = BMW 1998 318ti engine bay.jpg
|production = 1996–2000
|configuration = Inline-4
|head = Aluminium
|block = Cast iron
|valvetrain = DOHC
|fueltype = Petrol
| displacement = {{convert|1895|cc|L|1|order=flip|abbr=on}}
| bore = {{convert|85|mm|in|2|abbr=on}}
| stroke = {{convert|83.5|mm|in|2|abbr=on}}
|predecessor = BMW M42
|successor = BMW N42
}}
The BMW M44 is a DOHC four-cylinder petrol engine which replaced the BMW M42 and was produced from 1996 to 2000 at the Steyr factory.{{cite web |title=BMW M44B19 automotive engine |url=https://bmw-grouparchiv.de/research/detail/index.xhtml?id=3942483 |publisher=bmw-grouparchiv.de |access-date=14 August 2019}} It was produced alongside the BMW M43 SOHC four-cylinder engine, with the M44 being the higher performance engine. In 2000, the M44 was replaced by the BMW N42 engine.
Design
Compared with the M42, the M44 has roller rocker arms,{{cite web|title=M42 vs M44|url=http://www.318ti.org/forum/showthread.php?t=24736|website=www.318ti.org|accessdate=6 March 2017}} a hot-wire MAF,{{cite web|title=Whats a quick way to tell a M44 engine from a M42 engine?|url=https://www.bimmerforums.com/forum/showthread.php?1761036-Whats-a-quick-way-to-tell-a-M44-engine-from-a-M42-engine|website=www.bimmerforums.com|accessdate=6 March 2017}} displacement increased from {{convert|1.8|to|1.9|L|cuin|0|abbr=on}} and other detail changes such as a grey cast iron crankshaft replacing the forged steel item from the previous M42. As per the final versions of the M42, the M44 has a dual length intake manifold ("DISA"). Peak power is the same as the M42,{{cite web|title=BMW M42 and M44 Four Cylinder Engines|url=http://www.unixnerd.demon.co.uk/m42.html|website=www.unixnerd.demon.co.uk|accessdate=12 March 2017|archive-date=8 May 2019|archive-url=https://web.archive.org/web/20190508113301/http://www.unixnerd.demon.co.uk/m42.html|url-status=dead}} however mid-range power is increased significantly and peak torque is increased by {{convert|5|Nm|lbft|abbr=on|0}} at 200 rpm lower.{{cite web |title=Japanese BMW M44 engine document |url=http://bmw3series.johnavis.com/blog/1088/japanese-bmw-m44-engine-document/ |accessdate=12 February 2020}} There was also a 70% reduction in valve train friction which contributed to the engine being more quiet and fuel efficient than its predecessor.{{cite web |title=BMW M44 Engine Technical Information (1996) |url=http://bmw3series.johnavis.com/blog/734/bmw-m44-engine-1996/ |accessdate=12 February 2020}}
The M44 has a cast iron block and aluminium cylinder head, as per its predecessor.{{cite web |title=BMW M44 engine |url=https://australiancar.reviews/bmw_M44.php |website=www.australiancar.reviews |accessdate=3 March 2019 |archive-date=11 August 2020 |archive-url=https://web.archive.org/web/20200811030643/http://australiancar.reviews/bmw_M44.php |url-status=dead }}
Versions
| class=wikitable style="text-align: center;" | ||||
| Version | Displacement | Power | Torque | Years |
|---|---|---|---|---|
| M44B19 | {{convert|1895|cc|cuin|1|abbr=on}} | {{convert|103|kW|bhp|0|abbr=on}} at 6,000 rpm | {{convert|180|Nm|lbft|0|abbr=on}} at 4,300 rpm | 1996–2000 |
= M44B19 =
The M44B19 has a displacement of {{convert|1895|cc|cuin|abbr=on}},{{cite web|url=http://www.bmwheaven.com/database/engine.php?type=M44 |title=BMW Heaven Specification Database | Engine specifications for M44 engines |website=www.bmwheaven.com |date= |accessdate=2012-06-03}} which is achieved through a bore of {{convert|85.0|mm|in|2|abbr=on}} and a stroke of {{convert|83.5|mm|in|2|abbr=on}}. A compression ratio of 10.0:1 is used, along with the Bosch Motronic 5.2 engine management system.{{cite web|title=Motronic 5.2 (M44)|url=http://www.318ti.org/notebook/motronic_5.2/index.html|website=www.318ti.org|accessdate=7 March 2017}}
The crankshaft has an increased stroke from the M42's {{convert|81|mm|in|2|abbr=on}} and is cast instead of forged.{{cite web|title=BMW M44 Engine Technical Information (1996)|url=http://bmw3series.johnavis.com/blog/734/bmw-m44-engine-1996/|website=www.bmw3series.johnavis.com|accessdate=7 March 2017}} Also revised were the valve actuators which are of a roller pivoting arm type.{{cite web|title=Whats the difference between M44 and M42?|url=http://www.bimmerforums.co.uk/forum/f74/whats-difference-between-m44-m42-t105664/|website=www.bimmerforums.co.uk|accessdate=7 March 2017}}
Applications:
With time this engine was replaced by BMW N42 engine.