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Many sports cars have recently appeared on the market, and people's interest in and requirements for the cars are continuing to grow. The RX-7 was developed to be a first-class sports car that Mazda can be proud of worldwide as a trend leader for sports cars in the '90s. Among many innovations, its engine is the fruit of all the efforts Mazda has done to realize a “pure RE sports car” that takes every advantage of the rotary engine. This paper describes the aim of the development, main specifications, performance characteristics and major new technologies of the engine.

The 1990 RX-7's 13B rotary engines have been designed to give the spirited performance of a genuine sports car engine. This engine with improved response provides the operating ease, plus the oil and fuel economy expected by today's consumers. This paper describes the new technology and improvements employed in the 13B rotary engines including: the variable dynamic effect intake system the independent twin scroll turbo system (These are incorporated to improve intake.) optimization of transient fuel control improved control over knock and idle feedback a lighter rotor an ion-nitrided gear inertia moment reduction of the rotating system (to increase engine power and response) also including an electronically controlled oil metering system for improved lubrication.