I have my doubts about this technology... It takes a lot of power from an actuator to move and close a valve. At lower RPM it's less of a problem, as the solenoid will have more time to get the valve open. At higher RPM I don't see where cycle time on the valve could be maintained and still get the right amount of lift from the valve-we are talking miliseconds here.
Now, I am going to assume that we are talking about a valve with no return spring (solenoid will close the valve as well as open it), and that valve opening is partially assisted by the incoming charge of fuel/air mixture. The problem with this is that the valve essentially becomes an assisted reed valve, and the advantage of being able to time the valve are lost.
Sounds like a lot of work to make it happen.... Probably won't be a "valve" in the conventional context. I wonder how far the solenoid will be away from the valve? The further away, the worse it is because whatever connects the solenoid to the valve will be additional mass to accelerate. Speaking of heat, the solenoids themselves are going to get hotter than a motherfucker-it takes a lot of watts to move a solenoid capable of valve closure at 3500rpm (1/2 of a passenger car's rpm)
Dave