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Spark plugs heat range - 6G Celicas Forums
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.
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.
-SpedToe169+Dec 30, 2003 - 6:54 PM
NP. Just a warning the Iridum plugs are overrated. They really dont make much if any power for the extra cost. I would just go with some good platinum NGKs if it was me.
-SpedToe169+Dec 30, 2003 - 11:38 PM
Nope. The only advantage they supposedly create a better spark because the material is more durable and allows for a smaller electrode area. its supposed to make the spark more stable but its very marginal.
So, let me get this right, colder is better for forced induction? Explain more please!
The colder a plug is, the quicker it dissipates heat, too cold and they tend to foul, too hot and they can stay hot enough to pre-ignite the fuel, causing detonation (very bad thing) all ranges of a given plug have the exact same spark, so go with the factory or manufacturer recommended heat range for YOUR engine. and like he said above, forced induction needs colder plugs, as they tend to run hotter in the combustion chambers, unless you have turbo'd or added a supercharger or raised the compression, I'd use the factory recommended heat range plug.
One other comment, if you go with a different brand, look it up in their book. I used to work in an auto parts store, one day I looked up plugs for my car in the 5 top brands, then used the cross ref in each brands catalog to cross the others to an equivalent plug, out of 5 brands, I came up with 17 different plugs of various heat ranges...
One other comment, if you go with a different brand, look it up in their book. I used to work in an auto parts store, one day I looked up plugs for my car in the 5 top brands, then used the cross ref in each brands catalog to cross the others to an equivalent plug, out of 5 brands, I came up with 17 different plugs of various heat ranges...
Exactly right as ususal. >
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-SpedToe169+Dec 31, 2003 - 6:57 PM
I have denso iridiums,......no differnece but no complaints.
-ST-204+Dec 31, 2003 - 10:31 PM