Abstract: A rotary internal combustion engine has two opposing rotary discs. Each rotary disc has a half-cylindrical chamber located around its perimeter. An outer casing encompasses both rotary discs. Intake and exhaust ports and necessary engine controls are formed in said outer casing. Pistons formed in each said disc. Half of said piston is connected permanently to one said rotary disc the other half of said piston slides in the half cylindrical chamber of the opposing said rotary disc. The pistons and cylindrical chambers develop varying volumes in each chamber, depending on the position of each disc and respective piston. These varying volumes perform different cycles common to four stroke piston engines. Mechanical devises allow the discs to rotate in only one direction. Mechanical devises allow the disc to engage output shaft in only one direction. From output shaft work can be derived.

Abstract: A rotary internal combustion engine has two opposing rotary discs. Each rotary disc has a half-cylindrical chamber located around its perimeter. An outer casing encompasses both rotary discs. Intake and exhaust ports and necessary engine controls are formed in said outer casing. Pistons formed in each said disc. Half of said piston is connected permanently to one said rotary disc the other half of said piston slides in the half cylindrical chamber of the opposing said rotary disc. The pistons and cylindrical chambers develop varying volumes in each chamber, depending on the position of each disc and respective piston. These varying volumes perform different cycles common to four stroke piston engines. Mechanical devises allow the discs to rotate in only one direction. Mechanical devises allow the disc to engage output shaft in only one direction. From output shaft work can be derived.