Quote:
Originally Posted by mike the snake
When I reseached pneumatic valvetrains, I did see that some still used the cams to open the valves but used pneumatics to close the valves, basically "air springs".
I saw others that used solenoids and no cams.
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It's not solenoids, it's just cams with pneumatic springs. The better term is pneumatic spring, not pneumatic valvetrain.
A solenoid driven valve train that can regenerate the energy from the valve returning effectively is the holy grail of engine design.