Abstract: A rotary valve internal combustion engine has a piston connected to a crankshaft and reciprocatable in a cylinder, a combustion chamber being defined in part by the piston, and a rotary valve rotatable in a valve housing fixed relative to the cylinder, the rotary valve having a valve body containing a volume defining, in part, the combustion chamber and further having a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports.

Abstract: A cooling mechanism for a rotary valve cylinder engine 1 comprising a rotary valve cylinder 3 rotatably mounted within an outer cylindrical valve element 8, the rotary valve cylinder 3 and the outer cylindrical valve element 8 each being formed with a respective valve port 51, 71, 81, the rotary valve cylinder 3 being rotatable relative to the outer cylindrical valve element 8 to a position in which the ports 51, 71, 81 are aligned, the cooling mechanism comprising fluid passages 11, 28 formed in the rotary valve cylinder 3 and the outer cylindrical valve element 8 through which, in use, cooling oil flows.

Abstract: The invention relates to a valve seal mechanism for a rotatable valve assembly that provides a sealing function between a rotating first valve element and a fixed second valve element as used in a rotary cylinder valve engine. In one embodiment the seal mechansim comprises a substantially rigid sealing frame which surrounds and sealingly engages the periphery of the valve port of one of the cyclindrical valve elements and also sealingly engages a surface of the other cylindrical valve element. In another embodiment, the seal mechanism comprises a resiliently deflectable tubular element of variable diameter, the tubular element being mounted around a first valve element with an aperture of the tubular element being radially aligned with a valve port of the first valve element, the tubular element being biased radially outward of the first valve element.

Abstract: A rotating cylinder valve engine provides variable compression to the engine by axially moving the rotatable cylinder towards or away from the piston. The volumetric center of the combustion chamber is offset from the central axis of the piston. The engine cylinder is also ported to optimize performance.