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Old 10-27-2003, 02:37 AM   #1
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Default Colder Plug Questions?

So to go along eith my new Taylor 10.5 wires, I'm not to sure on what plugs I need. I know I can go one heat range colder, what about two? What'* the rule of thumb for mods and heat ranges? I will have rockers and headers by spring if that matters. Should I wait till those are on, then could I go 3 ranges? Whats the mileage out of all these plugs too.
AC Delco'* or Autolite'*?
Thanks in advance
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Old 10-27-2003, 01:09 PM   #2
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I've heard something like 1 heat range colder for every 40'ish in horsepower gains. The colder plugs will just foul sooner because the engine is still running hotter, it just keeps the plug from turning into a glow-plug and causing pre-ignition which is the father of detonation.
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Old 10-27-2003, 01:20 PM   #3
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I would stay stock heat range for now. Then when you install everything I would go one heat lower. Then take it to the dyno & get it tuned.
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Old 10-27-2003, 09:10 PM   #4
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I bought a 3.5 sc pulley, a 180 stat, a k&n filter in my stock airbox. Do you guys also recommend the one heat range plugs with this simple modification? I bought some delco'* already one heat range colder. Will installing then be better or worse with what I got? Mind you I'm picking up around 25hp'* and 40-50lb. ft of torque.
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Old 10-27-2003, 09:14 PM   #5
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Quote:
bought a 3.5 sc pulley, a 180 stat, a k&n filter in my stock airbox. Do you guys also recommend the one heat range plugs with this simple modification? I bought some delco'* already one heat range colder. Will installing then be better or worse with what I got? Mind you I'm picking up around 25hp'* and 40-50lb. ft of torque.
as for the plugs i would do 1 degree colder. Thats what i run.
AC-Delco 41-932 or something like that i can find the plug number in a bit.
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Old 10-27-2003, 09:17 PM   #6
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Speaking of overrating, how the heck are you getting 32psi?? I'm tempted to say you're talking about tire pressure, right? haha
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Old 10-27-2003, 09:19 PM   #7
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Quote:
So to go along eith my new Taylor 10.5 wires, I'm not to sure on what plugs I need. I know I can go one heat range colder, what about two? What'* the rule of thumb for mods and heat ranges? I will have rockers and headers by spring if that matters. Should I wait till those are on, then could I go 3 ranges? Whats the mileage out of all these plugs too.
AC Delco'* or Autolite'*?
with those maybe 1.5 degrees colder...IMO
also haven't heard the best things about the Auto-Lites.
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Old 10-27-2003, 09:22 PM   #8
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Quote:
Speaking of overrating, how the heck are you getting 32psi?? I'm tempted to say you're talking about tire pressure, right? haha
Yes RSA tires at 32 PSI all around...i'll modify that...
lol
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Old 10-27-2003, 09:36 PM   #9
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Taylor, I would run AC Delco 41-919'*. They are 1.5 ranges colder than stock and are what we ran on the GTP from when it had just a 3.4 pulley & CAI, until Sunday morning before we ran at the track when we decided to run the Autolite 103'* (3 ranges colder) to see if they would help. They did, so we left it that way. (I think the time it pulled is reason enough for that) The GTP ran a best of 12.594 @ 108.04 on the 41-919'*, so they are definately good plugs, just not quite cold enough for the 2.6 pulley on the GTP.
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Old 10-27-2003, 09:52 PM   #10
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Shawn, would you reccomend me going with 1 heat range cooler, or stay with stock? I haven't added HUGE amounts of hp, but it'* obviously noticeable. Or are my rapidfire'* cooler?
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