Abstract: A valve for an internal combustion engine includes a valve head, a valve stem and one or more vanes. The valve head comprises a valve face and a valve back and the valve stem is connected to and extends from the valve back. One or more vanes are connected to and positioned about at least one of the valve back and the valve stem adjacent the valve head.

Abstract: The present invention relates to an internal combustion engine exhaust valve having a valve head including a valve face and a valve back, wherein the valve face is convex, a cylindrical valve stem, and a rim that includes a valve seat; an exhaust valve assembly for an internal combustion engine that includes the exhaust valve of the present invention and an exhaust chamber; and an internal combustion engine including such an exhaust valve assembly. The present invention also relates to a method of increasing the efficiency of an internal combustion engine that involves providing an exhaust valve having a convex valve head and installing such an exhaust valve in an internal combustion engine, thereby increasing the efficiency of the engine.