Aspin valve
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An Aspin valve consists of a cone-shaped metal part fitted to the cylinder head. Aspin valves were first patented by Frank Metcalf Aspin in 1937 although the idea was probably devised before this time. It has a large opening in one side which reveals the gases in its internal combustion chamber to the spark plug, inlet port and outlet port accordingly. It is attached to the engine via a shaft at its top, allowing it to rotate horizontally above the cylinder.
