Aspin valve

An Aspin valve consists of a cone-shaped metal part fitted to the cylinder head in internal combustion. Aspin valves were first patented by Frank Metcalf Aspin in 1937, although the idea was devised before this time.

Aspin valve

An Aspin valve consists of a cone-shaped metal part fitted to the cylinder head in internal combustion. Aspin valves were first patented by Frank Metcalf Aspin in 1937, although the idea was devised before this time.