Editing Wankel engine (section)

===Car racing===
[[File:Mazda-787B.JPG|thumb|right|'''Figure 23.'''<br/>[[Mazda 787B]] ]]

The Sigma MC74 powered by a Mazda 12A engine was the first engine and only team from outside [[Western Europe]] or the United States to finish the entire 24{{nbsp}}hours of the [[24 Hours of Le Mans]] [[auto racing|race]], in 1974. [[Yojiro Terada]] was the driver of the MC74. Mazda was the first team from outside Western Europe or the United States to win Le Mans outright. It was also the only non-piston engined car to win Le Mans, which the company accomplished in 1991 with their four-rotor [[Mazda 787|787B]] ({{convert |5.24|L|cuin|0|abbr=on|disp=or}} displacement), rated by FIA formula at {{convert|4.708|L|cuin|0|abbr=on|disp=or}}). In the C2 class, all participants had the same amount of fuel. The only exception was the unregulated C1 Category 1. This category only allowed naturally aspirated engines. The Mazdas were classified as naturally aspirated to start with 830&nbsp;kg weight, 170&nbsp;kg less than the supercharged competitors.<ref>{{cite web |last1=Chin |first1=Joshua |date=2021-08-22 |title=The Rotary Mazda 787B Won At Le Mans 30 Years Ago |url= https://automacha.com/mazda-787b-achieves-historic-le-mans-victory-in-1991/ |access-date=2022-05-14 |website=automacha.com}}</ref> The cars under the Group C1 Category 1 regulations for 1991 were allowed to be another 80&nbsp;kg lighter than the 787B.<ref>Tare weight Peugeot 905 750kg</ref> In addition, Group C1 Category 1 had only permitted 3.5-liter naturally aspirated engines and had no fuel quantity limits.<ref>{{Cite web |title=Verbrauchsregeln der Gruppe C von 1982 bis 1991 – Motorsport kompakt erklärt |url=https://autonatives.de/verbrauchsregeln-der-gruppe-c-von-1982-bis-1991.html |website=autonatives.de| date=13 June 2021 }}</ref>