solenoid actuated valves 1

[stanglou]

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.

 

[tbuelna]

Sturman is farther along with their hydraulic VVT system than anyone else I know of:

http://www.sturmanindustries.com/main/hydraulicValveActuation.htm

 

[turbocohen]

A private label F1 component supplier developed a camless arrangement using Del West type gas springs and N2 actuation. It exceeds 23000 rpm at 7mm. Soft landing is maintained via zero volume end of stroke sensorless inductive motion control. As gas bottle pressure drops below 1500psi the rev limit drops. There is nothing online yet. Not practical for racing yet let alone oem's