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  • Side Gapping

    Anybody ever done this? Worth the effort? Drawbacks? Thanks!

    https://www.badasscars.com/index.cfm...prod/prd73.htm

  • #2
    Shit no. I gap mine regular at .035 and its fine. A stock 60 hp Vtwin ain't gonna care about fancy stuff like cutting back electrode or getting thenlosition exact in the head. Pull out the old ones slap a little antisize on the new gapped plugs and put em in.
    LET'S RIDE

    Comment


    • #3
      You can't get more horsepower out of a pig!

      Comment


      • #4
        There would be no drawbacks but you would not see any appreciable difference in performance or mileage with a slow revving low compression engine. It was an interesting read, though.

        Comment


        • roadiemort
          roadiemort commented
          Editing a comment
          The drawback is you don't get the mileage in distance before you need to replace the plugs again, Lmao.

        • Ironman
          Ironman commented
          Editing a comment
          Thanks, Chooch!

      • #5
        Thanks for bring up the anti-seize on the plug threads
        Lug Nut.
        Completely forgot about that.

        Comment


        • #6
          Down here in Florida with the heat in the corrosion I use Andy sleeves copper on just about everything I put in aluminum you just have to also remember though it does it does change the torque setting a little bit.

          Comment


          • #7
            This is a subject that I am well aware of, and have done a lot of research on this topic. Although in a stock engine with dished or flat top pistons you might not feel any performance gains with cut tip plugs and, or indexing the plugs, attention to detail in this area does help make a smoother running engine. I feel that it is "fine tuning" the combustion chamber. If you have the time to trim and smooth the ground electrodes along with indexing the plugs, then do it.
            I have studied and played around with this concept with positive results. Building several motors, one time we ran a engine dyno thru Western Wyo. Collage, and found a plus 1.5 hp improvement on a 350ci, 348 hp Chevy motor. The motor was a race engine, but was with flat top pistons. That sold me on doing this on my engines, even if the gain isn't that much, it's still a positive in performance. Some might not feel that it is worth doing these mods, but I feel any gain is worth the extra time for any positives. As for spark plug life, I've ran over 20k miles on them and the plugs are still in good shape. I just have to re-gap them due to wear around + or - .002".
            It's not for everyone, but anyone that likes to tinker with their motors, then I feel it's worth the time.
            I guess I'm anal about this stuff, or just a motor head?

            Comment


            • Ironman
              Ironman commented
              Editing a comment
              I guess I should have said that improving HP wasn't what motivated my question. More complete combustion seems like a good thing to me.

            • Duke
              Duke commented
              Editing a comment
              You are right Dave, but the way I am, I think having 1/4 free hp all the time is well worth the time put into this tuning, even if it was 1/16 hp, I'd still do it. But you know me, I'm anal about engine performance.

            • Duke
              Duke commented
              Editing a comment
              Hey Dave, I just went to fractions from decimals. Lol

          • #8
            I've always had positive results with indexing plugs but I wouldn't think there would be any measurable improvement when starting with dual plug heads. It would seem that would supply efficient spark "coverage". What are your thoughts?

            Comment


            • #9
              My thoughts on the twin plug heads that are located the way Road Star's are, is to index the plugs towards the center of the combustion chamber and away from the shrouded part of the head. I feel this gives a better chance for a fresh charge to pass thru the gap of the plugs as the gasses fill the cylinder.
              I myself, having JE pop-up pistons, found that gaping the plugs at .030" to .032" gives my engine a little better throttle response, and the plugs seem to have a cleaner and more even look to them. In my younger days, I use to think that wider spark plug gaps would help the ignition light off the fuel better, and it can under the right conditions with proper indexing, but since then, I've found that more energy is better than more voltage when talking about ignition under higher compression. Most engines have some sorts of misfires, "not meaning continuous", so doing a little extra trying to make the conditions the best for misfires not to happen is a positive thing.
              Indexing plugs is not so much the spark location, but having a good fresh volatile charge where and when the spark happens.
              Like I said earlier, I am a little anal about trying to get the most out of my engine. Any positives, and no negatives is the way I look at it.

              Comment


              • #10
                No sir, not anal. Passionate. There’s nothing wrong with looking for free performance. I remember wedging a piece of vacuum hose behind my points to help prevent them from floating at high rpms. I think the days of HEI and the factory gaps of .045 and.060 got us thinking in the wrong direction. I’ve been gapping my plugs at .033 with good results throughout the life of the plugs. When all the low hanging fruit has been picked it’s time to start reaching. Don’t stop.

                Comment


                • Duke
                  Duke commented
                  Editing a comment
                  Ya the old HEI distributor! That sucker zapped me more that once. I once had seen the spark jump from the top of the cap to the distributor housing. I use to use that distributor in my dirt track car and it was good for 5500 RPMs.

              • #11
                Hey davej The number of comments (and comment number down the right side, e.g. #7.6) indicates that there is more than meets the eye and if you click on the little black triangle you get to see, as Paul Harvey would say, the rest of the story.



                Comment


                • davej
                  davej commented
                  Editing a comment
                  Thanks I didn't know that.

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