Editing Wankel engine (section)

===Mazda===
Mazda claimed to have solved the apex seal problem, operating test engines at high speed for 300 hours without failure.<ref name="JhYt4Sa"/> After years of development, [[Mazda Wankel engine|Mazda's first rotary engine]] car was the 1967 [[Mazda Cosmo|Cosmo 110S]]. The company followed with several Wankel ("rotary" in the company's terminology) vehicles, including a [[Mazda Parkway|bus]] and a [[Mazda Rotary Pickup|pickup truck]]. Customers often cited the cars' smoothness of operation. However, Mazda chose a method to comply with [[hydrocarbon]] [[emission standard]]s which, while less expensive to produce, increased fuel consumption.

Mazda later abandoned the rotary in most of their automotive designs, continuing to use the engine in their [[sports car]] range only. The company normally used two-rotor designs. A more advanced twin-[[Turbocharger|turbo]] three-rotor engine was fitted in the 1990 [[Mazda Cosmo#Series JC (Eunos Cosmo, 1990–1996)|Eunos Cosmo]] sports car. In 2003, Mazda introduced the [[Renesis (Engine)|Renesis]] engine fitted in the [[Mazda RX-8|RX-8]]. The Renesis engine relocated the ports for exhaust from the periphery of the rotary housing to the sides, allowing for larger overall ports, and better airflow.<ref name="Qbqnp">Masaki Ohkubo et al., SAE paper 2004-01-1790</ref> The Renesis is capable of {{cvt|238|hp|sigfig=3|order=flip}} with improved fuel economy, reliability, and lower emissions than prior Mazda rotary engines,<ref name="cBaLx">{{cite web|url=http://www.classicmazda.co.uk/1999_doc/rotary2.pdf |title=Rotary Engine (chapter 1: today and tomorrow) |publisher=Mazda |pages=6–7 |year=1999 |access-date=2011-12-11 |url-status=dead |archive-url= https://web.archive.org/web/20100705061356/http://classicmazda.co.uk/1999_doc/rotary2.pdf |archive-date=July 5, 2010}}</ref> all from a nominal 2.6&nbsp;L displacement, but this was not enough to meet more stringent emissions standards. Mazda ended production of their rotary engine in 2012 after the engine failed to meet the more stringent [[European emission standards|Euro 5 emission standards]], leaving no automotive company selling a rotary-powered road vehicle until 2023.<ref name="CGHhL">{{cite news|url= https://www.bloomberg.com/news/2012-06-25/mazda-ends-hummm-as-rotary-gives-way-to-hydrogen-cells-cars.html |title=Mazda Ends Hummm as Rotary Gives Way to Hydrogen Cells: Cars |first1=Anna |last1=Mukai |access-date=2012-06-26 |date=2012-06-25 |work=Bloomberg}}</ref>

Mazda launched the [[Mazda MX-30|MX-30 R-EV]] hybrid fitted with a Wankel engine range extender in March 2023.<ref name="capomazda.com"/> The Wankel engine has no direct connection to the wheels and serves only to charge the battery. It is a single-rotor unit with a {{cvt|830|cm3|in3|1}} engine and a rated power output of {{cvt|55|kW|hp|0}}. The engine has [[petrol direct injection]], [[exhaust gas recirculation]], and an exhaust-gas treatment system with a [[Three-way catalyst]] and a [[Diesel particulate filter|particulate filter]]. The engine is Euro 6d-ISC-FCM-compliant.<ref name="auto motor und sport 2023">{{cite web |title=Mazda MX-30 e-Skyactiv R-EV (2023) : Elektro-SUV mit Wankelmotor als Range Extender |website=auto-motor-und-sport.de |first1=Gerd |last1=Stegmaier |first2=Thiemo |last2=Fleck |first3=Torsten |last3=Seibt| date=2023-01-13 |url=https://www.auto-motor-und-sport.de/neuheiten/mazda-mx-30-bev-wankel-generator-serieller-plug-in-hybrid/ |language=de |access-date=2023-01-15}}</ref><ref name="auto1">{{Cite web|url=https://www.insidemazda.co.uk/2023/10/11/mazda-mx-30-e-skyactiv-r-ev-the-plug-in-hybrid-that-always-drives-electric/|title=Mazda MX-30 e-Skyactiv R-EV the plug-in hybrid that always drives electric &#124; Inside Mazda}}</ref>