1. yellow rose

    yellow rose Doctor of Thinkology.

    Messages:
    22,212
    Likes Received:
    18256
    Joined:
    Jun 19, 2015
    Location:
    Living on the razors edge
    Local Time:
    8:48 PM
    I always look at every plug when verifying the gap. I’ve seen all kinds of stuff you wouldn’t see if you didn’t look right at them. I think it was a set of Autolites, but it may have been Champions that out of a set of 8, three had a hairline fracture down the porcelain. Have no idea how that happened but I was down to one of the last plugs and found it. Went back though them all and found 3 more, but I needed my magnifyer to see those.

    You find all kinds of crap, like the ground wire isn’t welded on correctly. I’ve seen them fall off. Or the ground wire isn’t parallel to the center wire.

    Just drives me nuts.
     
    • Like Like x 2
    • Agree Agree x 1
    • MomsDuster

      MomsDuster FABO Gold Member FABO Gold Member

      Messages:
      4,066
      Likes Received:
      3844
      Joined:
      Apr 17, 2016
      Location:
      Vacaville Ca
      Local Time:
      8:48 PM
      Ok, here’s a couple of plugs after a 50 mile cruise yesterday. No WOT runs. I have added vacuum advance FBO billet distributor with 20* initial, 14* mechanical @3200rpm, and 12*@12” of vacuum per Dons recommendation. I think I’m really close here. What do the gurus think. 2 plugs here with 2 different heat ranges.
      Plug 1

      DEF78F10-39F5-4967-BC17-A5AD0F0F086B.jpeg

      39312910-026F-4762-A296-5482F7BD692C.jpeg

      D38115B2-93A5-4E9F-9AA9-AEF7D8D8984C.jpeg
       
    • MomsDuster

      MomsDuster FABO Gold Member FABO Gold Member

      Messages:
      4,066
      Likes Received:
      3844
      Joined:
      Apr 17, 2016
      Location:
      Vacaville Ca
      Local Time:
      8:48 PM
      Plug 2 a little hotter

      78393237-8167-449F-80BE-13E7F4CFCB9D.jpeg

      4B7B36D6-A600-4EA5-ACC2-696DDA99CA37.jpeg

      DFCC60B7-18F0-48B8-8EA0-31BDB3BE7588.jpeg
       
    • yellow rose

      yellow rose Doctor of Thinkology.

      Messages:
      22,212
      Likes Received:
      18256
      Joined:
      Jun 19, 2015
      Location:
      Living on the razors edge
      Local Time:
      8:48 PM
      Are they out of the same cylinder? I ask because the ground wire on the second plug looks like it has a very lean area around the plug. Maybe. The first plug doesn’t have that.

      I like the first plug better. You’ve got the idle and cruise about nailed.

      Are you using ported or manifold vacuum for the vacuum advance?
       
    • MomsDuster

      MomsDuster FABO Gold Member FABO Gold Member

      Messages:
      4,066
      Likes Received:
      3844
      Joined:
      Apr 17, 2016
      Location:
      Vacaville Ca
      Local Time:
      8:48 PM
      No they are not from same cylinder. First plug is from cyl#3 and
      second plug is from cyl# 8
      Using manifold vacuum
       
    • famous bob

      famous bob mopar misfit FABO Gold Member

      Messages:
      16,648
      Likes Received:
      6416
      Joined:
      Aug 14, 2011
      Location:
      okla
      Local Time:
      10:48 PM
      Does it need a hair more timeing ?? Second plug looks a hair bit lean . I am not an expert by any means tho !
       
      • Like Like x 1
      • 512Stroker

        512Stroker We are all here because we are not all there.

        Messages:
        1,469
        Likes Received:
        1027
        Joined:
        May 30, 2016
        Location:
        Freedom, MO
        Local Time:
        10:48 PM
        First plug is nice, timing is right on maybe just a hair lean on the part throttle, need more miles to make an accurate read.
        Second plug is weird I would clean that one and re run it
        May not have been clean when you put it in.
         
        • Like Like x 1
        • Dana67Dart

          Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

          Messages:
          4,368
          Likes Received:
          2662
          Joined:
          Jul 16, 2017
          Location:
          Northern Colorado
          Local Time:
          9:48 PM
          IMHO...

          Run tests in the same cyl. Under as close as the same driving and outside air temperatures as you can.

          Remove as many variables as you can.
           
        • mopowers

          mopowers Well-Known Member

          Messages:
          4,729
          Likes Received:
          1846
          Joined:
          Feb 15, 2006
          Location:
          West Sacramento, CA
          Local Time:
          8:48 PM
          Is there a general rule of thumb for which plug should be used for reading when the engine has a dual plane manifold? I'd imagine reading them all would provide the most info, but you're still somewhat limited by use of a carb in terms of tuning each cylinder, right?
           
        • A Body 440 WHY NOT

          A Body 440 WHY NOT Well-Known Member

          Messages:
          153
          Likes Received:
          47
          Joined:
          Sep 28, 2019
          Location:
          Jersey
          Local Time:
          8:48 PM
          • Like Like x 1
          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.