[oldE]

Janus,

It is certainly possible. Don't discount, however, the great loads on such a valve system having to open and close through magnetic induction, reversing the direction of the device dozens of times each second, in perfect time. How big does your solenoid have to get to give you the speed & control you need. For the cost of the rare earth magnets to get the job done and possible ceramics to keep the valve weight down, you can machine and harden a lot of camshafts.
It is possible we are at a cross over point between two technologies. We won't see electro valves in production for a few years yet, until some engineer finds a way to make them faster and cheaper.
Les