Mazda has been developing Mazda unique technologies of rotary engines over the past 40 years. Its basic structure is simple, therefor it is lightweight and yet produces high power. Rotary engines provide more advantages than reciprocating engines, such as flat torque in the entire engine speed range, little vibration and noise due to the absence of the intake/exhaust valves and high reliability and durability in the operating range where engine speed and load are high. This has been demonstrated by the fact that rotary engine cars won in motor races. Because the rotary engine development is one of Mazda unique technologies, it has a repetitive history of unwavering challenge and innovative evolution. Rotary engine technologies have made a great leap forward in the RENESIS as well. This paper presents the structure of the rotary engine, the history of the development and motor sports activities.
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