Why air pressure vs. electric actuation - Saab General Bulletin Board - Saabnet.com
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My guess: Comparing the size of an intake or exhaust valve to the tiny plunger in a fuel injector: the valve is much larger and heavier, would probably require an actuator somewhat similar to the size of a starter solenoid to control it with authority. Eight or sixteen (or 20 if using 5V/cylinder) solenoids would not only take up a lot of space but would be a large electric load that would need to be controlled somehow, yet remain immune to the heat inherent in their location. Probably easier to use air pressure for the power and electronics for the control.
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