Editing Straight-twin engine (section)

== Usage in automobiles ==
[[File:Fiat 500 engine.jpg|thumb|[[Longitudinal engine|Longitudinal]] straight-twin engine at the rear of a [[Fiat 500]]]]
Although two-cylinder engines are quite uncommon in cars, the straight-twin layout has been used for several automobile engines over time.

The first known straight-twin engine was a variant of the [[Gottlieb Daimler#Daimler Motors and the Phönix engine (1890 to 1900)|Daimler Motors' ''Phoenix'']] engine introduced in 1895; these engines were used in [[Panhard]] cars that year.<ref>{{cite book |author= Brazendale|year= 1983|title= Classic Cars: 50 Years of the World's Finest Automotive Design|url= {{Google books|g6y9umQmtfUC|Classic Cars: 50 Years of the World's Finest Automotive Design|page= 57|plainurl=yes}}|publisher= Bookthrift|pages= 49, 57|isbn= 0-6710-5103-2|access-date= 26 April 2014}}</ref> Another early straight-twin engined car was the 1898 [[Decauville automobile|Decauville Voiturelle]], which used a pair of cylinders taken from a de Dion model mounted fore and aft and positioned below the seat.<ref name="AntiqueSedgewick" />

Straight-twin engines have been used in various small cars, such as the 1957 [[Fiat 500]], 1958 [[Subaru 360]], 1958 [[NSU Prinz]],<ref name="LightCarCaunter" /><!--ref name="MotorV165" /--> 1962 [[Mitsubishi Minica]], 1967 [[Honda N360]], 1970 [[Honda Z600]], 1972 [[Fiat 126]],<ref name="HandbookNorbye" /><ref name="PopSciFeb75" /> 1988 [[VAZ-1111|VAZ Oka]],<ref>{{cite journal|title=Noutăți. VAZ 111 |journal=Autoturism |issue=1/1989}} p. 8.</ref> 1988 [[Dacia Lăstun]],<ref>{{cite journal |last=Teodor|first=Pompiliu |title=Dacia 500 Lăstun |journal=Autoturism |issue=2/1989}} p. 5.</ref> 1980 [[Daihatsu Cuore]],<ref>{{Cite book | title = Quattroruote: Tutte le Auto del Mondo 1985 | editor = Mastrostefano, Raffaele | publisher = Editoriale Domus S.p.A | ref = TAM85 | year = 1985 | pages = 233–234 | language = it | location = Milano | isbn = 88-7212-012-8}}</ref> and the 2008 [[Tata Nano]].<ref name="WorldsCheapestAutocar" />

As of January 2024, petrol straight-twin engines used in production cars currently just include the [[Fiat TwinAir engine]] (used in various models from Fiat, Lancia and Alfa Romeo). 

The [[Piaggio Porter]] made use of a diesel straight-twin engine until 2020.<ref>{{cite web |url= http://www.piaggioveicolicommerciali.it/veicolicommerciali/IT/it/home/modelli/quattroruote/porter-max.html|title= Piaggio Porter Maxxi |website= piaggioveicolicommerciali.it |language= it|access-date=21 January 2014}}</ref>