1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

what spark plug gap to use?

Discussion in '40- & 55-Series Tech' started by lovetoski, Jul 13, 2003.

  1. lovetoski

    lovetoski SILVER Star

    Messages:
    4,421
    Likes Received:
    119
    Joined:
    Jul 13, 2003
    I've recently installed an accell hi-voltage coil, and 8mm wires. I'm pretty sure the engine runs better. I've heard that you can increase the spark plug gap with a high-voltage coil, but am not sure how big to go?

    Any and all suggestions (regarding spark plug gap!) are welcome.
     
  2. dd113

    dd113

    Messages:
    2,923
    Likes Received:
    1
    Joined:
    Jun 13, 2003
    Sort of a hunt and peck theory. Go 20 over and see what happens, add or subtract 10 and see again. Many variables will determine the final best gap. Also, you cna advance the timing quite a bit with the accell. I am running .055 with my jacobs but .060 kills it.
     
  3. lovetoski

    lovetoski SILVER Star

    Messages:
    4,421
    Likes Received:
    119
    Joined:
    Jul 13, 2003
    Thanks David. Empirical approach I can work with. Two questions though if you don't mind...

    1. What spark plug do you use?
    2. When playing with advance and gap, which do you adj first?

    Thanks!
     
  4. dd113

    dd113

    Messages:
    2,923
    Likes Received:
    1
    Joined:
    Jun 13, 2003
    I use the NGK from NAPA. Stay away from the platinum. POS in my mind. Basically the stock plug.I would jump your timing to just below the window and re gap the plugs. This process can take a while just go slow and make small cj=hanges.