Rather than use multiple pistons and cylinders, the Wankel engine uses a triangular rotor that revolves around a shaft. The tips of the rotor remain in constant contact with the combustion walls forming combustion chambers as it rotates.
Advantages
1.Typically a Wankel engine will use 40% fewer parts and weight a third less than a conventional combustion engine.
2.With a continuous rotation rather than pistonheads pulling and pushing, the rotary engine is very smooth and can typically rev higher.
3.Fewer moving parts makes for better efficiency.
Disadvantages
1.Until very recently, the efficiency of rotary engines was inferior to conventional engines. Emissions were also worse.
2.The latest evolution of engines from Mazda have gone a long way to address these issues.
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