Desmodromic valve
Videos
A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
Desmodromic poppet valve in a Ducati engine
Ducati motocycle desmodromic valve timing engine parts: camshaft, valves, opening rocker arm and closing rocker arm
Valvetrain
Videos
A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture into the combu
Cutaway of a dual overhead camshaft engine
1969 AMC V8 overhead valve engine. The rocker cover has been removed, so elements of the pushrods, rocker arms, valve springs, and valves are visible.
Ship engine with open rocker arms