Editing Flat-twelve engine (section)

=== Formula One ===
The first known flat-twelve engine was built by Porsche in 1947 for the abandoned [[Cisitalia Grand Prix]] racing car. The engine, known as the Porsche Typ 360, was supercharged and had a displacement of {{convert|1.5|L|cuin|0|abbr=on}}.<ref>{{cite web |title=Cisitalia Grand Prix (Porsche type 360) |url=https://www.stuttcars.com/porsche-models/360/ |website=www.stuttcars.com |access-date=6 October 2019 |language=en}}</ref> One engine was built and the car conducted top speed testing, but it never competed in any races.<ref name="stevemckelvie">{{cite web |url=https://stevemckelvie.files.wordpress.com/2013/01/cisitalia-build-story-by-martin-schroeder.pdf |title=Cisitalia 360 Grand Prix Car |website=stevemckelvie.files.wordpress.com |url-status=dead |archive-url=https://web.archive.org/web/20150227010337/https://stevemckelvie.files.wordpress.com/2013/01/cisitalia-build-story-by-martin-schroeder.pdf |archive-date= 27 February 2015}}</ref>

In 1964–65, the [[Ferrari 158#Ferrari 1512|Ferrari 512 F1]] competed in several Formula One races.<ref>{{cite web |title=1964 - 1965 Ferrari 1512 F1 - Images, Specifications and Information |url=http://www.ultimatecarpage.com/car/139/Ferrari-1512-F1.html |website=www.ultimatecarpage.com |access-date=5 October 2019}}</ref> The 512 F1 was powered by a {{convert|1.5|L|cuin|0|abbr=on}} flat-twelve engine and raced alongside the V8-engined Ferrari 158 upon which it was based. Ferrari returned to using flat-twelve engines in 1970, when the [[Ferrari 312B]] switched from the V12 engine used by its predecessor. Its successor, the [[Ferrari 312T]], was introduced in 1975 and won the Formula One constructors championships from 1975 to 1979.<ref>{{cite web |title=Niki Lauda |url=https://www.formula1.com/en/championship/drivers/hall-of-fame/Niki_Lauda.html |website=www.formula1.com |access-date=5 October 2019 |language=en}}</ref><ref>{{cite web |title=Jody Scheckter |url=https://www.formula1.com/en/championship/drivers/hall-of-fame/Jody_Scheckter.html |website=www.formula1.com |access-date=5 October 2019 |language=en}}</ref> The success of the Ferrari 312T led other Formula One teams to build flat-twelve engines, such as the 1979 [[Alfa Romeo 177]].

In 1990, the [[Subaru 1235]] flat-twelve engine was built for Subaru's unsuccessful attempt to compete in Formula One as an engine manufacturer.