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Spark Plug Recommendation Request 8BA Flathead

Discussion in 'The Hokey Ass Message Board' started by Hodad, Jul 29, 2010.

  1. Hodad
    Joined: Dec 26, 2001
    Posts: 250

    Hodad
    Member

    I have been enjoying my AV8 Tudor sedan a lot this summer.. great weather so far up here in Maine and I have been driving it to the beach at least weekly. I am having a bit of a problem with spark. I am running Autolight 216's and after a couple hundred miles they coated with black carbon and if I step on it.. the ol girl coughs a bit. I am running a single stromberg 97.. which has new stock jets .. when the plugs are clean and new runs great.. 200 miles or so.. a little wheezy and coughs on hard acceleration. Should I run a hotter plug..? Recomendations would greatly be appreciated. the picture is from Halloween.. only one I have here at work... thank you Hodad
     
    Last edited: Jul 29, 2010
  2. Hodad
    Joined: Dec 26, 2001
    Posts: 250

    Hodad
    Member

    picture?
     

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  3. cuznbrucie
    Joined: May 1, 2005
    Posts: 2,567

    cuznbrucie
    Member

    First of all, I think you either mean a *Stromberg 97* or maybe a stock *Holley 94*...........no such thing as a Stromberg 98.........

    Now.......I have been running NGK B6L's for many years with no issues.....strong revs and no loading up.......try a set....

    Mike Harrison, of the Hot Rod Company sells them at the Alliance discount....

    CB
     
  4. Mr. Clean
    Joined: Jun 21, 2006
    Posts: 88

    Mr. Clean
    Member

    Check the little plunger in the power by-pass jet and make sure its working freely. When I rebuilt my Strombergs this spring, all three power by-pass jets were stuck in the open position. While the top is off, I'd also check the float level.
     

  5. Hodad
    Joined: Dec 26, 2001
    Posts: 250

    Hodad
    Member

    97 oops.. anyhow.. thanks for the advice.. will try the plugs.. and check the plunger
     
  6. Dale Fairfax
    Joined: Jan 10, 2006
    Posts: 2,585

    Dale Fairfax
    Member Emeritus

    Take it out on a good, straight road where you can "open it up" in 3rd gear and run it until it stops missing. Will have to repeat every 200 miles or so.



     
  7. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    You shoudn't have to worry about jetting with a single standard carb...check as above, check float level, be sure fuel pressure is very low.
    Then worry about aircleaner...if small hotrod type, road test without it...and find out if advance is working.
    Stock '49-53 distrib sometimes has severe lack of advance, certain aftermarket '49-53 types can be coming in way too late so you have inadequate advance at actual normal driving RPM's.
     
  8. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    ...running retarded oft mimics a rich condition, and a stockish flathead that isn't burning excess oil or something is generally not very sensitive to plugs, assuming here that the plug mentioned cross references to somewhere near an H10.
     
  9. imnezrider
    Joined: Apr 27, 2010
    Posts: 199

    imnezrider
    Member

    Indicates a rich mixture. I wouldn't try to "bandaide" it by trying hotter plugs. Always keep in mind that everything was engineered properly in the beginning and ran the recommended plugs with no problems. Basically, I agree with Mr. Clean........
     
  10. Hodad
    Joined: Dec 26, 2001
    Posts: 250

    Hodad
    Member

    thankyou all for the tips.
     
  11. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    The main points...stock Stromberg jetting and H10 equivalent plugs should be pretty close to right for you, so you need to diagnose what is happening and why, not jacking around heat ranges or jets.
     

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