Patent ID: 8667950

Claim:
An oil-less engine, comprising: an engine casing with a front cover and a rear cover; a plurality of fireheads circumferentially positioned on the inside wall of said casing; a multi-angular rotor having multiple sides and positioned in said casing, wherein said rotor revolves around an offset axis, and, at least one side of said rotor faces a firehead selected from said plurality of fireheads; a means for circularly guiding said rotor to a top-dead-center position of a firehead selected from said plurality of fireheads, wherein each side of said rotor at revolution achieves a top-dead-center position with a respective firehead for a combustion; and a means for transferring rotational energy generated by said rotor to a transmission, wherein said multi-angular rotor at a respective top dead center position does not make contact with said inside wall of said casing.