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Old 10-11-2006, 07:09 PM   #1
scarecrow0529
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Default when to use a hotter plug

i was wondering i had a bunch of work done on my engine like the head has been ported polished, shaved, bored etc. when should i use a hotter plug.

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Old 10-11-2006, 07:21 PM   #2
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Default Re: when to use a hotter plug

These are pretty significant performance mods. You'd probably get more and better answers posing this question in our S-Series Mods section.

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Old 10-11-2006, 07:41 PM   #3
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Default Re: when to use a hotter plug

I think you mean a "colder" plug.

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Old 10-11-2006, 09:08 PM   #4
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Default Re: when to use a hotter plug

ur right colder

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Old 10-11-2006, 09:49 PM   #5
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Default Re: when to use a hotter plug

If you can go colder without fouling then you've answered your own question.

The stock plug is a hotter compromise that lets the car start 20 times in 2 miles between the assembly line and dealer delivery prep.

Might be good to throw a good scantool on and see if you're presently getting any knock retard. If your tune is good and KR zero going colder won't help much.

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Old 10-12-2006, 12:08 AM   #6
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Default Re: when to use a hotter plug

I think you usually want it fairly hot for better performance and economy. But if it is too hot and causes a lot of detonation, well, you know.

I about the only reason you would need to look for a colder plug would be if the compression was raised, but then you should also be using higher octane fuel. But I don't think this is your case.

Your best bet would indeed be investigating how much knock is going on currently.

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