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> Spark plugs heat range, What's the difference between 6,7 and 8
post Dec 30, 2003 - 4:05 AM
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ST-204

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post Dec 30, 2003 - 1:54 PM
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SpedToe169



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Ummm, that doesn't mean anything unless you tell us what brand of plug you are using.

The different heat ranges refer to the heat conduction characteristic of the plug. A 'hot' plug will retain a lot of heat instead of allowing it to flow into the head. A cold plug trys to let all its heat flow rapidly into the head. Its generally good to have the hottest plug you can manage without it causing detonation. Whenever you go with forced induction you'll usually want to go with a colder plug.

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