| Your heat range theory is backwards. A hot plug takes longer to cool off than a cold plug, therefore at high rpm's a hot plug will burn up and a cold plug will foul at low rpm's. The variable here, be it small, is fuel mixture. A little rich, a little hotter and a little lean a little colder. Cam duration and compression ratio are variables too, but rpm is the biggest factor.
Last edited by lsloan289 : 03-28-2008 at 06:35 PM.
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