Editing Straight-four engine (section)

== Usage in production cars ==
[[File:Fordsidevalve.jpg|thumb |1908–1941 [[Ford Model T]] engine]]
[[File:Alfa Romeo 1750 GTV engine.jpg|thumb|1970 [[Alfa Romeo Twin Cam engine]] ]]

Most modern straight-four engines used in cars have a displacement of {{convert|1.5|-|2.5|L|cuin|0|abbr=on}}. The smallest automotive straight-four engine was used in the 1963–1967 [[Honda T360]] kei truck and has a displacement of {{convert|356|cc|cid|abbr=on}}, while the largest mass-produced straight-four car engine is the 1999–2019 [[Mitsubishi_4M4_engine#4M41|Mitsubishi 4M41]] diesel engine which was used in the Mitsubishi Pajero and has a displacement of {{convert|3.2|L|cuin|0|abbr=on}}.<ref>[https://web.archive.org/web/20111005110138/http://www.pajero.com/gene/en/specifications/pdf/pajero_gene_spec.pdf Pajero/Montero Specifications] (PDF)</ref><ref>{{cite web |url=http://www.mitsubishi-motors.de/TechnicalSpecification.aspx?PMID=100&BTID=2674&VID1=5138&VID2=0&LangType=1031 |title=MITSUBISHI MOTORS in Deutschland |website=Mitsubishi-motors.de |date=2016-08-16 |access-date=2017-05-23 |url-status=dead |archive-url=https://web.archive.org/web/20130606081539/http://www.mitsubishi-motors.de/TechnicalSpecification.aspx?PMID=100&BTID=2674&VID1=5138&VID2=0&LangType=1031 |archive-date=2013-06-06 }}</ref>

Significant straight-four car engines include:

* 1954–1994 [[Alfa Romeo Twin Cam engine]]: one of the first mass-produced twin-cam engines.<ref name="bussoobit">{{cite web|url=http://www.italiaspeed.com/2006/cars/alfa_romeo/01/busso/2601.html|title=GIUSEPPE BUSSO, 1913-2006: A TRIBUTE TO ALFA ROMEO AND FERRARI'S GREAT ENGINEER|work=www.italiaspeed.com}}</ref> In 1990, it became the first production engine with [[variable valve timing]].<ref name="autobytel">{{cite web|url=http://www.autobytel.com/car-ownership/variable-valve-timing-vvt-104258/|title=Variable Valve Timing (VVT)|work=www.autobytel.com}}</ref>
* 1908–1941 [[Ford Model T engine]]: one of the most widely produced engines in the world.
* 1951–2000 [[BMC A-Series engine]]: the first engine to be used in a mass-production transverse-engined front-wheel drive car.
* 1966–2000 [[Fiat Twin Cam engine]]: one of the first mass-produced twin-cam engines, produced from 1959.
* 1968–1981 [[Triumph Slant-4 engine]]: an early [[multi-valve]] engine which formed the basis of Saab's first turbocharged engines.
* 2000–2009 [[Honda F20C engine]]: produced the highest specific output for a [[naturally aspirated engine]] of its time.