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Re: Error Noted in Technical Manual?

From: kc
Fromemail: kc
Category: Technical
Remote Name:
Date: 08 Feb 2005
Time: 22:16:41


Since the figures are opposite to what I said and I am sure my statement was correct either or both the sets of figures are incorrect. One fact that might make them correct in the 1950's is that the higher temperatures of a competition engine may have demanded a greater contact area so as to improve cooling of the valve face. Alternatively, the higher compression on the engine may have needed the wider face to maintain a seal. Modern valves and hardened seats probably change the values anyway. It is obviously more reliable to have a wider seal than to trim it to almost nothing in an attempt to get more performance. You can afford to cut it fine when you rebuild after every race.

Last changed: November 19, 2008