Rotary valve four-cycle engine

Claim 1

A four-cycle internal combustion engine having at least one cylinder and a piston reciprocated therein by a piston rod and crankshaft operating in an engine block, in combination with an aluminum combustion head tightly connected to the top of said block, said head having a fuel inlet port and an exhaust port therein respectively for each cylinder and said head also having internal passages therein respectively between said fuel inlet port in said head and said fuel discharge port in said head and also between said exhaust port in said head and said exhaust inlet port in said head, a cylindrical bore therein parallel to the axis of said crankshaft, a cast iron cylindrical sleeve of limited thickness press-fitted within said cylindrical bore and a solid elongated cylindrical valve rotatable within said sleeve and complementary therewith in size, said valve having formed in the periphery thereof respectively for each cylinder a pair of transverse chord-like passages placed at an angle to each other and respectively comprising a pair of fuel-inlet and exhaust discharge passages communicating respectively in sequence between said cylinders and said fuel-inlet and exhaust ports in said head, and a spark plug port in said head for each cylinder in which a spark plug is mounted in each said port.