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Spark Plug gap question

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  • Spark Plug gap question

    My car has always ran ritch so my question is...

    If I make the gap slighty bigger or smaller will that effect anything and maybe my plugs will last a little longer with a hotter spark? I remember my dad muttering something to me one time and I dont remember what he told me, like bigger, gap hotter spark, burns more fuel. Or visa versa.

    Jess

  • #2
    The smaller the hotter and the larger the more retarded they run.
    Don Fields likes to gap them at .028 if it makes a difference....


    Disclaimer: Remember, I know absolutely nothing, but it doesn't prevent me from having an opinion or suggestion. :

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    • #3
      Thanks, that is what the oe gap is, so thats what i went with.

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      • #4
        I'm about to go and change out some ignition components

        Does anyone know what is the gap the stock plugs are set at out of the box ?

        Jeff
        1988 E30 M3, my Lachsilber Track Rat

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        • #5
          Originally posted by Magnus
          The smaller the hotter and the larger the more retarded they run.
          Don Fields likes to gap them at .028 if it makes a difference....
          stupid question but thats .028 inches right ?

          jeff
          1988 E30 M3, my Lachsilber Track Rat

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          • #6
            chiltons manual says .24, but I always gap them at .28




            The Chuck giveth, and the Chuck taketh away

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            • #7
              Originally posted by JLee
              Does anyone know what is the gap the stock plugs are set at out of the box ?
              Jeff,
              They may be close but you should plan on checking and re-gapping them anyway.

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              • #8
                Originally posted by Mick
                Jeff,
                They may be close but you should plan on checking and re-gapping them anyway.
                He's right, never trust them out of the box.

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                • #9
                  Originally posted by Highrever View Post
                  chiltons manual says .24, but I always gap them at .28
                  This diagram http://e30world.com/Maintenance/BMW-...arkplug-Change shows that anything between .24 and .28 is acceptable. Are there any differences in performance if gapping them at .24 rather than .28?


                  Thanks,


                  Patrick

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