Abstract: A rotary engine which comprises a cylindrical casing having an annular rotor disposed therein, the casing adjacent face of said rotor cooperating with recesses formed in the face of said casing to define a fuel admission chamber and a planarwise aligned fuel compression chamber, as well as an offset exhaust chamber. A pair of piston-receiving cylindrical chambers are formed in said rotor and with said pistons being engaged to connecting rods for securement to a shaft axially normal to said casing but eccentric thereof. One of said cylindrical chambers being adapted to communicate with said fuel admission and fuel compression chambers successively upon each rotation of said shaft and said other cylindrical chamber being simultaneously successively connected with an extension of said fuel compression chamber; a fuel igniter, and said exhaust chamber.