Quote:
Originally Posted by akima
That's good news!
Is anyone in here (probably chone) able to explain in simple terms what the difference between CR9E and CR8E spark plugs are and why the CR9E plugs caused this issue? I'm curious!
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The difference is the heat range - the length of the heat path and how much heat is retained by the plug.
When you are running constant high RPMs or making more power than stock you typically drop to a colder plug because you are building more heat than "normal".
I'm not sure that the colder-than-stock plug caused the problems here, but it didn't help either.
Here's NGK's full explanation of heat range -
http://www.ngksparkplugs.com/tech_su...k_plugs/p2.asp