Reply to "dyno of 351"

panteradougMember

quote:
Originally posted by René #4406:
It would be best if the cam grinders publish the lift curves. I have never understood why they do not do it, I know that they consider it to be their Know How but it is false since it is possible and easy to take these curves.

In addition it would allow to calculate the clearance between the piston and the valves and calculate the depth of relief valves without having to do a lot of tests.

The procedure for determining piston to valve clearances is a standard/known procedure.

You don't calculate it, you measure it with clay.

For safety a "standard" number is used. I think it is .080" on the intake, .100" on the exhaust.

US pistons are all made with those considerations and you don't get close until you are around .650" lift.

So that really puts the "Pro Stock" and NASCAR type engines in danger with .700+ lifts.

5/21/185:02 AM

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