Editing Wankel engine (section)

===Thermodynamic disadvantages===
Wankel rotary engines mainly suffer from poor thermodynamics caused by the Wankel engine's design with its huge surface area and poor combustion chamber shape. As an effect of this, the Wankel engine has slow and incomplete combustion, which results in high fuel consumption and bad exhaust gas behavior.<ref name="Bensinger 1973 p. 85">{{cite book |last1=Bensinger |first1=Wolf-Dieter |year=1973 |title=Rotationskolben-Verbrennungsmotoren |place=Berlin, Heidelberg, DE / New York, NY |isbn=978-3-540-05886-1 |oclc=251737493 |language=de |page=85}}</ref> Wankel engines can reach a typical maximum efficiency of about 30&nbsp;percent.<ref name="Automotive Handbook 2022 page 642">{{cite book |editor=Bosch, Robert |year=2022 |title=Automotive Handbook |publisher=Wiley |isbn=978-1-119-91190-6 |page=642}}</ref>

In a Wankel rotary engine, fuel combustion is slow, because the combustion chamber is long, thin, and moving. Flame travel occurs almost exclusively in the direction of rotor movement, adding to the poor quenching of the fuel and air mixture, being the main source of unburnt hydrocarbons at high engine speeds: The trailing side of the combustion chamber naturally produces a "squeeze stream" that prevents the flame from reaching the chamber's trailing edge, which worsens the consequences of the fuel and air mixture quenching poorly. Direct fuel injection, in which fuel is injected towards the leading edge of the combustion chamber, can minimize the amount of unburnt fuel in the exhaust.<ref name="telegraph.co.uk">{{cite news |title=Mazda stays loyal to rotary engines |date=2012-09-18 |newspaper=[[Daily Telegraph]] |url= https://www.telegraph.co.uk/motoring/news/9550675/Mazda-stays-loyal-to-rotary-engines.html |access-date=2014-02-01 |url-access=subscription |url-status=live |archive-url= https://ghostarchive.org/archive/20220112/https://www.telegraph.co.uk/motoring/news/9550675/Mazda-stays-loyal-to-rotary-engines.html |archive-date=2022-01-12}}{{cbignore}}</ref><ref name=Pj5Jo>{{cite news |first1=Andrew |last1=English |date=5 March 2010 |title=Audi A1 e-tron |department=Geneva Motor Show |newspaper=[[Daily Telegraph]] |url=https://www.telegraph.co.uk/motoring/motor-shows/geneva-motor-show/7367967/Geneva-Motor-Show-Audi-A1-e-tron.html |url-access=subscription |url-status=live |archive-url=https://ghostarchive.org/archive/20220112/https://www.telegraph.co.uk/motoring/motor-shows/geneva-motor-show/7367967/Geneva-Motor-Show-Audi-A1-e-tron.html |archive-date=2022-01-12}}{{cbignore}}</ref>