Abstract: A rotary piston engine comprises a housing having a trochoidal peripheral wall and side walls on both sides thereof, a rotor adapted to perform a planetary rotary motion along the inner surface of the peripheral wall, and intake and exhaust ports formed in the housing. The engine performs intake, compression, combustion and exhaust strokes of a working fluid in accordance with the planetary rotary motion of the rotor. An air injection port is formed in the peripheral wall of the housing between the exhaust port and a portion of the minor axis of the trochoidal curve, being adapted to communicate with the intake chamber formed between the peripheral wall and the rotor.

Abstract: A rotary piston engine comprises a housing having a trochoidal peripheral wall and side walls on both sides thereof, a rotor adapted to perform a planetary rotary motion along the inner surface of the peripheral wall and intake and exhaust ports formed in the housing. The engine performs intake, compression, combustion and exhaust of a working fluid by means of the planetary rotary motion of the rotor. An air injection port is formed in the peripheral wall of the housing between the exhaust port and a portion of the peripheral wall through which the minor axis of the trochoidal curve extends.

Abstract: There is provided an ignition system for a rotary piston engine comprising first and second ignition means mounted in a rotor housing. The first ignition means is positioned ahead of the second ignition means in the direction of rotation of a rotor. Switching means is actuated in response to the output signal of an engine speed sensor and an intake manifold vacuum sensor so that current is supplied to the second ignition means only during specified periods such as during the high engine speed operation and high engine load operation.