Quote:
Originally Posted by Old Tele man
Pulling a "suction" takes energy just as pushing a "compression" does.
|
Yes, but in a closed cylinder, the air acts as a spring, with the only significant losses (not related to friction, which would be there anyway) being the heat losses when the compressed air losses energy to the cylinder walls.
This is why cylinder deactivation works better if you close all of the valves, rather than leave them all open. Open, and you're doing the work of pushing air through the valves. Closed, and although you're compressing the air, after TDC that compressed air gives its energy back to the piston.