Auto Racing: Valve Clearance, e mail address, valve clearance

Question
how does valve clearance affects engine performance??what if we increase/decrease valve clearance.....what will happen to engine performance?????how do we know that the valve clearance that we have given to an engine is right????

Answer
All clearances in an engine are a at least partially there to make room for heat related expansion.

Sorry, I have no graphic presentations of the answer I sent. I'd suggest you print out my answer, and then study a cylinder head , valve/rocker assembly, and try to visualize what happens when all that stuff collides with a piston at say- - -7500 RPM- -- Trust me, it ain't pretty !!

Please send me a follow up question or your e-mail address and I'll try to get a bit more info from a real pro engine builder close by (used to do Winston Cup motors.)

Dan