Relationship of RPM on power to operate valvetrain

[Tom Walker]

Basically, here is my question. Does increasing RPM equate to the valvetrain taking more power to operator it from the standpoint of losing more and more of the force of the valve spring to follow the contour of the closing flank of the camshaft? Just as riding a roller coaster gives you a feeling of weightlessness as you go down the grade, as RPM increase to higher levels, does not the valve springs continue to release less and less force back into the system, until ultimately, you reach a stage of valve float? Any one know of any tests or have any insights. Just curious.

[Tom Walker]

Sorry, did not mean to post twice

[miniv8]

Yes.. As RPM increases the force required to keep everything in line increases. It's a mass vs' speed thing.

If ALL the force from opening a valve was gained back from closing it, we could be on our way to perpetual motion, which is not the case. We gain back what we trade off in friction of valvespring operation, with more power from precise valve timing and RPM capability's.

Precise valve timing allows us to reach the limits of induction with safer and tighter operating clearances. That requires the strongest valvetrain you can find, as light as you can afford, with a spring to suit the valve motion and RPM.