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Old 01-12-2005, 04:08 PM   #1
MustGoFast
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Default Spark Plug Gap What & Why

Well I started w/ a search and found a lot of recommendation w/ out reason and a lot of speculation w/ out support... Yes I've also read the big FAQ and while helpful doesn't really answer my ?

So I'm just going to ask.. I'm finally going out and grabbing some plugs 1 step colder for my stg4 wrx. I have found in the past that both Phil (elemental) and Nathan (txs) in the past have recommended the NGK PFR7G-11 for a quality plat plug. I have seen others say that this is over gapped for our use and I need the non -11 if so why is it such a trusted tuner would recommend this.

Further when I go to actually gap these plugs before install what should I shoot for .032 (high end of recoomendation) or .028 (low end of spec)... and what is the advanatage/disadvantage of a larger/smaller gap

In my knowledge the difference is the larger gap should allow for more power and complete burn w/ the risk of blow out .. and thus the recommendation is the highest gap your ignition system can drive w/ out this blow out.. does this mean I should attempt a gabp near .032 or even greater if I have never experienced blow out in the past?

Thanks for reading... Chuck
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Last edited by MustGoFast; 01-12-2005 at 04:14 PM.
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Old 01-12-2005, 05:59 PM   #2
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lots of views no thoughts?
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Old 01-12-2005, 06:07 PM   #3
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I just bought the BKR7E copper plugs and am looking for some of the same answers.
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Old 01-12-2005, 08:06 PM   #4
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While I respect the opinions of those tuners, I asked the identical question to the folks at Cobb Tuning. When I get my tune there I will be using OEM plugs with ~50k miles on them. When asked about type/style/gap/heat range of plugs, I was told to not bother. :shrug:
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Old 01-12-2005, 09:18 PM   #5
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someone, hotrod I believe, posted a VERY concise answer to this question in one of the 'sparkplug' threads....I looked and can't seem to find the one....

BUT....

http://www.ngksparkplugs.com/techinf...200&country=US

"Q: What is the maximum I can open or close the gap?

A: NGK doesn't recommend adjusting the spark plug gap < or > .008". The reason for this is the ground electrode and center electrode won't line up properly, hindering spark plug performance."


....and THAT is why the '-11' is the WRONG plug for a turbo'd EJ engine.
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Old 01-12-2005, 10:51 PM   #6
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Unabomber>Uncle Scotty at the search function.

hotrod's post
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Old 01-13-2005, 01:34 AM   #7
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Unabomber, uncle scotty, i am that much wiser after reading that post, i solute you

P.S. Unabomber i didn't read your entire Spark plug FAQ but if its not in there that post should have a reference or two from hotrod's post.
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Old 01-13-2005, 06:49 AM   #8
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After re-reading his post yesterday, it's now linked in my FAQ.
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Old 01-13-2005, 04:19 PM   #9
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Yep found hotrod's thing to be exactly as I thought the wider the non problematic gap the better.....

Thank you all.
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