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  1. #1
    improvised tmg97gp's Avatar
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    Indexing spark plugs

    Will indexing spark plugs give you any RPM?
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  2. #2
    All hail the Chief! fullboogie's Avatar
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    I'm going to get blasted for saying this, but in my experience no. I've done back to back testing and didn't get jack. But others will swear by it.

  3. #3
    i will get all the rest i need when im dead corkycat's Avatar
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    i got 30rpm,s but it definetely is minimal....one thing you will notice for sure is a smoother sounding engine, so in my op it must be a good thing

  4. #4
    improvised tmg97gp's Avatar
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    Arrow

    I indexed my plugs today, So that the electrode gap ended up facing the exhaust side of the cylinder. Is this correct??

  5. #5
    james k's Avatar
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    I like to do it because it takes time and can become a pain in the a$$ often,gotta love performance mods..

  6. #6
    Moderator RX951's Avatar
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    http://greenhulk.net/forums/showthre...ht=index+plugs
    see post #3

    I did it the cheap way. I bought 6 spark plugs. Installed each of them one by one and found the ones that faced in the direction closest as possible to simulate indexing.

    I personally seen more results J-gapping vs. indexing. but even when I J-gap a plug, I will still point the gap towards the exhaust.

    With J-gapping, I seen 30 rpms and a smoother idle. With just indexing alone, I seen nothing.

  7. #7
    Nothin' runs like a Deere IowanGPR's Avatar
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    the J gap really does help it run smooth, and the index adds to that. performance increase is minimally noticable.

  8. #8
    WATER WOODY's Avatar
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    Quote Originally Posted by fullboogie View Post
    I'm going to get blasted for saying this, but in my experience no. I've done back to back testing and didn't get jack. But others will swear by it.

    Agreed......i saw 20 rpm gain but i pulled out dirty plugs and installed new side gapped/indexed plugs. Ive tested new plugs with new indexed/side gapped plugs with same rpm's. I still index them anyway.

  9. #9
    sleeplessnMS's Avatar
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    hmmmm J gapping eh? Might try this......

  10. #10
    Chine Walker
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    Any one have pics of a properly done "j" plug?

    jp

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