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Old 01-20-2004, 05:06 PM   #1
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Default Which Spark Plugs

I just replaced all the spark plugs with just regular new AC Delcos. But I'm wondering if I should have went a heat range or two colder because of the mods I'm running. Would I benefit from a cooler heat range plug? I'd imagine leaving the gap at .060" would be fine, it doesn't seem to be blowing out the spark at all, but I've seen some people running NGK'* of a cooler heat range so I'm curious. Thanks.
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Old 01-20-2004, 05:07 PM   #2
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With a modified boosted engine, it would be wise to go colder. It keeps the explosion temps down so your pistons won't take too much of a beating, and you won't get Knock from the boost.
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Old 01-20-2004, 05:15 PM   #3
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i think will went to heat ranges colder he running the same pulley set-up
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Old 01-20-2004, 05:23 PM   #4
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ok, I'll probably go with the NGK'* then. Napa carries them, should I just ask for 2 heat ranges cooler? or will they even carry it?
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Old 01-21-2004, 12:03 AM   #5
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My original plugs from the factory were NGK'*. I would recommend starting with one range cooler to start.
Cooler plugs will not make your combustion temps cooler but they will dissapate heat and keep the plug tip cooler so they are less likely to create pre-detonation which will be detected and make your PCM pull timing....aka knock retard.
If you go too cool, the plug will foul with carbon because it won't be hot enought to burn off the deposits and stay clean.
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Old 01-24-2004, 07:47 PM   #6
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Should I bother with the gap of the plugs since I'm going cooler? stock is .060" and the plugs i got today are .045" that need to be gapped... should i just stick with .060"? or go smaller?
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Old 01-24-2004, 10:11 PM   #7
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Stay with stock .060" but you could try .058" as a minimum.
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