![]() The key for comparing the displacement between the 4-cycle engine and the rotary engine is in studying the number of rotations for a thermodynamic cycle to occur. Rather than force participants who drove vehicles with piston engines, who were the majority, to halve their quoted displacement, most racing organizations decided to double the quoted displacement of Wankel engines. The only engine to diverge from this formula was the rare 13A, which used a 120 mm (4.7 in) rotor radius and 17.5 mm (0.69 in) crankshaft offset.Īs Wankel engines became commonplace in motorsport, the problem of correctly representing their displacement for the purposes of competition arose. Nearly all Mazda production Wankel engines share a single rotor radius, 105 mm (4.1 in), with a 15 mm (0.59 in) crankshaft offset. Note that this only counts a single face of each rotor as the entire rotor's displacement, because with the eccentric shaft – crankshaft – spinning at three times the rate of the rotor, only one power stroke is created per output revolution, thus only one face of the rotor is actually working per "crankshaft" revolution, roughly equivalent to a 2-stroke engine of similar displacement to a single rotor face. The displacement of rotor can be calculated asģ ⋅ 3 ⋅ D e p t h ⋅ R a d i u s 2 ⋅ ( O f f s e t / R a d i u s ) 1000 These metrics function similarly to the bore and stroke measurements of a piston engine. Wankel engines can be classified by their geometric size in terms of radius (rotor center to tip distance, also the median stator radius) and depth (rotor thickness), and offset (crank throw, eccentricity, also 1/4 the difference between stator's major and minor axes). See also: Wankel Engine § Chamber volume and displacement In 2023, Mazda reintroduced the engine as a generator for the 2023 MX-30 e-Skyactiv R-EV plug-in hybrid. Since the end of production of the Mazda RX-8 in 2012, the engine was produced only for single seater racing, with the one-make Star Mazda Championship being contested with a Wankel engine until 2017 the series' transition to using a Mazda-branded piston engine in 2018 temporarily ended the production of the engine. Mazda put the engine into series production with NSU ( Ro80) and Citroën ( GS Birotor) as part of the Comotor joint-venture between 19. The engines became popular with kit car builders, hot rodders and in light aircraft because of their light weight, compact size, tuning potential and inherently high power-to-weight ratio-as is true for all Wankel-type engines. Mazda rotary engines have a reputation for being relatively small and powerful at the expense of poor fuel efficiency. Over the years, displacement has been increased and turbocharging has been added. Wankel engines were invented in 1950s by Felix Wankel, a German engineer. The Mazda Wankel engines are a family of Wankel rotary combustion car engines produced by Mazda. Motor vehicle engine Wankel rotary engines ![]()
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