Editing Wankel engine (section)

===Multifuel Wankel engine===
A different approach from a compression ignition (Diesel) Wankel engine is a non-CI, multifuel Wankel engine that is capable of operating on a huge variety of fuels: diesel, petrol, kerosene, methanol, natural gas, and hydrogen.<ref name="auto">{{Cite web |url=https://www.energy-saxony.net/fileadmin/Inhalte/Downloads/Veranstaltungen/2020/Lausitzer_Energiefachtagung/Pitches/03_Wankel_SuperTec_Dr._Holger_Hanisch.pdf |title=Hydrogen & Multi-fuel Engines for Sustainable Power & Mobility |archive-url=https://web.archive.org/web/20210225160308/https://www.energy-saxony.net/fileadmin/Inhalte/Downloads/Veranstaltungen/2020/Lausitzer_Energiefachtagung/Pitches/03_Wankel_SuperTec_Dr._Holger_Hanisch.pdf |archive-date=2021-02-25}}</ref><ref>Wankel Journal, No. 74, January 2015, p. 23</ref> German engineer Dankwart Eiermann designed this engine at Wankel SuperTec (WST) in the early 2000s. It has a chamber volume of 500&nbsp;cm<sup>3</sup> (cc) and an indicated power output of {{convert|50|kW|hp|sigfig=3|abbr=on}} per rotor. Versions with one up to four rotors are possible.<ref name="Wankel Journal p. 22">{{Cite journal |date=January 2015 |journal=Wankel Journal |number=74 |page=22}}</ref>

The WST engine has a common-rail direct injection system operating on a stratified charge principle. Similar to a Diesel engine and unlike a conventional Wankel engine, the WST engine compresses air rather than an air–fuel mixture as in the four-cycle engine compression phase. Fuel is only injected into the compressed air shortly before top-dead centre, which results in stratified charge (i.e., no homogeneous mixture). A spark plug is used to initiate combustion.<ref>Wankel Journal, No. 74, January 2015, p. 24</ref> The pressure at the end of the compression phase and during combustion is lower than in a conventional Diesel engine,<ref name="Wankel Journal p. 22"/> and the fuel consumption is equivalent to that of a small [[Indirect injection#Precombustion chamber|indirect injection compression ignition]] engine (i.e., >250&nbsp;g/(kW·h)).<ref>Wankel Journal, No. 74, January 2015, p. 27</ref>

Diesel-fuel-powered variants of the WST Wankel engine are being used as [[Auxiliary power unit|APUs]] in 60 Deutsche Bahn diesel locomotives. The WST diesel fuel engines can produce up to {{convert|400|kW|hp|sigfig=3|abbr=on}}.<ref name="lr-online.de 2020">{{cite web |title=Wirtschaft: Wankel Supertec forscht in Cottbus mit Uni-Nachwuchs |website=lr-online.de |date=2020-09-05 |url=https://www.lr-online.de/lausitz/cottbus/wirtschaft-wankel-supertec-forscht-in-cottbus-mit-uni-nachwuchs-51085230.html |language=de |access-date=2023-01-29}}</ref><ref name="auto"/>