Wankel (Rotary) Wankel (Rotary) EnginesEngines

By: Hoa ChuBy: Hoa Chu

IntroductionIntroduction

► A type of Internal A type of Internal Combustion Engine Combustion Engine that uses a rotary that uses a rotary design.design.

► Uses Four strokes Uses Four strokes cycle (Otto cycle).cycle (Otto cycle).

►Developed in 1951 Developed in 1951 by Felix Wankel.by Felix Wankel.

Rotary DesignRotary Design

► 4 stroke engine (intake, 4 stroke engine (intake, compression, compression, combustion, exhaust)combustion, exhaust)

► Rotor on eccentric shaft.Rotor on eccentric shaft.► Design to Minimize Design to Minimize

Volume while Volume while Maximizing Maximizing Compression ratio.Compression ratio.

► Reuleaux Rotor – Reuleaux Rotor – Triangular shaped with Triangular shaped with equaled width.equaled width.

ProPro

►Much simpler Much simpler comparing to its comparing to its piston counterpart.piston counterpart.

► Power to weight Power to weight ratio is superior ratio is superior than piston engines.than piston engines.

► Smooth power flow Smooth power flow and high RPM.and high RPM.

►No Seizure at high No Seizure at high temperature.temperature.

ConCon

► Sealing, leaks from the Sealing, leaks from the apex seals greatly apex seals greatly reduces efficiency of the reduces efficiency of the engine.engine.

► High Operating High Operating Temperature, the housing Temperature, the housing operates at steady state operates at steady state with constant heating in with constant heating in each chamber.each chamber.

► Low fuel efficiency and Low fuel efficiency and shorter engine life due to shorter engine life due to damaged seals.damaged seals.

ApplicationsApplications

Rotor Vs PistonRotor Vs Piston

13B 13B 1.3 Liters1.3 Liters (146 hp @ 6500 rpm (146 hp @ 6500 rpm and 138 ft·lbf )and 138 ft·lbf )

KA24DE KA24DE 2.4 Liters2.4 Liters (155 hp @ 5600 rpm (155 hp @ 5600 rpm and 160 ft·lbf)and 160 ft·lbf)

Mazda Rx-7 (1989-1992)Mazda Rx-7 (1989-1992) Nissan 240sx (1991-1994)Nissan 240sx (1991-1994)

Questions?Questions?

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Wankel EnginesWankel Engines

Hoa ChuHoa Chu