What is the viability of actuating the intake/exhaust valves of an engine using solenoid valves. If it were possible, it would allow displacement on demand, true VVT, and a mechanical energy loss advantage.Ball Valves I recall seeing something on this some time ago. A guy had developed an engine that operated as you describe, looked rather ingenious. Check Valves The valve springs were forcing the valves open, and he used solenoids to hold them shut. This had not been practical in the past, but given the advances in onboard computer technology it should be doable. Not sure how the electrical requirements would affect power though. Its been done. Gate Valves FEV had a few cars driving around 5 or 6 years ago. I takes a lot of power to hold a spring open, and you don't regain any of that energy when the spring closes. There are also a lot of people working on hydraulic opening of valves, using high speed solenoids to control the hydraulic oil. what about opening the valve with the solenoid and holding it closed with a spring? Butterfly Valves anyone have any ideas on where i could get a solenoid that was capable of opening high spring pressures?You can buy a cylinder head with controllable valves.Globe Valves Lotus makes them, it is called AVT.

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