Chatting to a mate about Valve Clearences the other day. [1]
He reckons that on highly tuned shimmed engines with firm valve springs that the valve itself becomes elongated. He also reckoned that Cam followers and cams don't wear.
Now I think that cam followers *do* wear because there's metal on metal contact.
I'm not so sure about valves getting longer. Do they? Is it really the spring?
What makes valve clearences go too tight? What makes valve clearences go too loose?
[1] Yeah - I don't get out much. ;-)
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Parp, Parp!
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Too tight - Valve seat recession.
Too Loose - Cam / Follower wear.
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