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A Direct Injection Stratified Charge Rotary Engine ( DISC-RE ) with a pilot flame ignition system has been studied to find the possibility of simultaneous reductions of fuel consumption rate and HC exhaust gas emissions. Firstly, combustion characteristics in a model combustion chamber, which simulates the DISC-RE were examined from the viewpoints of calculation and experiment. The high speed photography and the indicated pressure analysis were experimentally performed while numerical calculations of the mixture formation and combustion processes were also carried out. As a result, it has been found that the combustion using the pilot flame ignition system is much activated and a better ignitability is attained under lean mixtures than using a spark ignition system. Secondly, a single rotor with 650 cc displacement DISC-RE was built as a prototype. Combustion characteristics and its performance were tested using a combustion analyzer.

In response to today's market demands, technological development for high-powered rotary engines has been under way for application to passenger models and racing engines. This paper, describes first the development work devoted to achieve higher output, including a turbocharger system, tuned induction and exhaust systems, combustion chamber shape, ignition system. New technologies used for components so as to cope with higher power output, thus securing engine reliability and durability are discussed. Those technologies include a new surface treatment for improved lubrication of the trochoid surface, reduction in rotor gear stress, and optimization of the spark plug and igniter system. Those development efforts resulted in production of: TURBO CHARGED 573 cc × 2 rotors, 165 ps/6500 rpm engine for passenger car and 573 cc × 2 rotors, more than 260 ps/9000 rpm engine and 654 cc × 2 rotors, more than 300 ps/9000 rpm engine for racing.

A Direct Injection Stratified Charge Rotary Engine (DISC-RE) with a pilot flame ignition system which has high ignition energy, large flame contact area and long duration of ignition source, has been examined comparing with a spark ignition system, using a model combustion chamber simulating a DISC-RE. As a result, it was found that the combustion using the pilot flame ignition system was activated and that a better ignitability was attained under lean mixture conditions than using a spark ignition system. To analyze these experimental results, numerical calculations of the mixture formation and combustion process were carried out. Numerical analyses proved that the pilot flame ignition system was superior to the spark ignition system as the pilot flame ignition made large-area ignition source and large inflammable mixture region. Finally, a single rotor with 650 cc displacement DISC-RE was built as a prototype.