 Spark plugs heat range, What's the difference between 6,7 and 8 |
 Dec 30, 2003 - 4:05 AM
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Enthusiast  Joined Dec 21, '03 From Lynnwood, WA Currently Offline Reputation: 0 (0%)  |
As topic
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Dec 30, 2003 - 1:54 PM
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 Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
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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Dec 30, 2003 - 5:39 PM
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Enthusiast Joined Dec 21, '03 From Lynnwood, WA Currently Offline Reputation: 0 (0%) |
Thx a lot of ur reply, I am thinking about which brands is better for our Celica now, they are Denso Iridium and NGK IX Iridium |
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Dec 30, 2003 - 6:38 PM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
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.
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Dec 30, 2003 - 7:59 PM
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Enthusiast Joined Dec 21, '03 From Lynnwood, WA Currently Offline Reputation: 0 (0%) |
But somebody told me that the Iridium sparks are for much last longer than Platium sparks wo, aren't they?? |
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Dec 30, 2003 - 11:13 PM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
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.
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Dec 31, 2003 - 2:47 AM
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Enthusiast Joined May 22, '03 From Wahiawa, Hawaii Currently Offline Reputation: 0 (0%) |
So, let me get this right, colder is better for forced induction? Explain more please!
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Dec 31, 2003 - 1:47 PM
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Enthusiast Joined Aug 31, '02 From KC Currently Offline Reputation: 0 (0%) |
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... |
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Dec 31, 2003 - 1:57 PM
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Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
Exactly right as ususal.
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Dec 31, 2003 - 5:31 PM
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Enthusiast Joined Dec 21, '03 From Lynnwood, WA Currently Offline Reputation: 0 (0%) |
So anyway, which brands is suitable for our car in ur mind?? Is NGK or HKS or Denso?? |
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Dec 31, 2003 - 7:42 PM
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Enthusiast Joined Apr 14, '03 Currently Offline Reputation: 0 (0%) |
I have denso iridiums,......no differnece but no complaints.
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Dec 31, 2003 - 11:49 PM
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Enthusiast Joined Dec 21, '03 From Lynnwood, WA Currently Offline Reputation: 0 (0%) |
By the way, do u guy think the heat range 7 is suitable for our car, coz I drive fast sometimes in my side |
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