Reply to "dyno of 351"

rene4406Member

quote:
Originally posted by PanteraDoug:

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.

We are obliged to measure it with clay because we do not know the lift curve, if this curve is known it is quite possible and easy to calculate it is much faster than to measure it with the 'clay.

When building a motor with a stroke, a rod length, a compression height and a custom compression ratio, we can not be satisfied with the "standard" calculation rules, it is essential to check.

5/21/185:16 AM

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