Quote:
Originally Posted by MadisonMPG
I will post it, but I disagree with it. The spring pushes back just as hard as you pushed it down.
.......here it is
That didn't work.
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To some extent, yes, you can measure the torque at different degrees and on the "downhill" side of a lobe you will get about the same force pushing on your torque wrench as you had on the same spot going uphill.
BUT, the valves themselves are reciprocating, and have mass, so that the faster you spin the camshaft, the more force it takes to jerk the valve open, which is lost energy. As well I suspect that the springs do not return as much energy at higher speeds as they have to use some energy to accelerate the valve in the closed direction.