1. Wankel (Rotary) Engines By: Hoa Chu

2. Introduction ► A type of Internal Combustion Engine that uses a rotary design. ► Uses Four strokes cycle (Otto cycle). ► Developed in 1951 by Felix Wankel.

3. Rotary Design ► 4 stroke engine (intake, compression, combustion, exhaust) ► Rotor on eccentric shaft. ► Design to Minimize Volume while Maximizing Compression ratio. ► Reuleaux Rotor – Triangular shaped with equaled width.

4. Pro ► Much simpler comparing to its piston counterpart. ► Power to weight ratio is superior than piston engines. ► Smooth power flow and high RPM. ► No Seizure at high temperature.

5. Con ► Sealing, leaks from the apex seals greatly reduces efficiency of the engine. ► High Operating Temperature, the housing operates at steady state with constant heating in each chamber. ► Low fuel efficiency and shorter engine life due to damaged seals.

6. Applications

7. Rotor Vs Piston 13B 1.3 Liters (146 hp @ 6500 rpm and 138 ft·lbf ) KA24DE 2.4 Liters (155 hp @ 5600 rpm and 160 ft·lbf) Mazda Rx-7 (1989-1992) Nissan 240sx (1991-1994)

8. Questions? ▲ ▲ ▲ Wankel Engines Hoa Chu