Quote:
Originally Posted by NeilBlanchard
I don't think you get the work back from compressing the valve springs -- the springs cannot be 100% spring back, they are pushing on the cam shaft, which is geared down, and there is a lot of friction involved in both directions. Can you imagine trying to spin the crankshaft by turning the crankshaft?
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Actually, you can and do, with only the heat lost in cam/rocker/lifter friction and spring internal damping. Mechanical advantages do not lose work energy. No imagination necessary.