Quote:
Originally Posted by Dragncar
Its a good video. A detailed video mostly for newbies.
There is stuff there (Vizard) even though he says there is not.
But he does use a flow sheet to pick a cam . I think thats a good idea.
The stuff about valve springs and them being a straight parasitic drag ? He did not mention the other side of the lobe giving some back.
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One should use all info available to spec a cam. Knowledge is power.
As far as spring pressures go I remember great debates on this Website in regards to that subject. I think it was finally decided as one spring was opening and fighting the spring pressures another was being helped by the pressure as it closed. So they cancelled each other out regardless how much pressure was used.... I
always thought that would mean an assembled engine would spin by itself...that has yet to happen.
I'm sure Dan Whitmore told you about the gains in power he found by reducing spring pressures.