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Technical Banger---off idle stumble!!!

Discussion in 'Traditional Hot Rods' started by bangerbob, May 14, 2016.

  1. bangerbob
    Joined: Jul 2, 2014
    Posts: 161

    bangerbob

    My banger powered Roadster has a slight but annoying off idle stumble!!! Idles great , after stumble runs great , has a Holly 847 carb and homemade intake manifold. has 34 self advance distributer set to 5 Degree BTC at idle---stock ign system. Carb squirts good on acceleration. Could the stock spark system be to weak to handle the squirt?? IMG_0418.JPG
     

    Attached Files:

  2. junk yard kid
    Joined: Nov 11, 2007
    Posts: 2,717

    junk yard kid
    Member

    Try changing or cleaning your spark plugs. Mine never last to long.
     
  3. power valve may be opening too late. Change it by shimming the spring or stretching it.

    Holley 847 Diagram
    [​IMG] 1. Power Piston Assembly
    2. Bowl Gasket
    3.Nozzle Plug
    4. Nozzle Plug Washer
    5. Idle Tube
    6. Nozzle Bar Gasket
    7. Nozzle Bar Assembly
    8. Nozzle Bar Gasket
    9. Pump Operating Rod
    10. Nozzle Bar Screen
    11. Retainer Spring
    12. Return Spring Pump
    13. Pump Assembly
    14. Retainer Check Ball
    15. Check Ball
    16. Retainer Needle
    17. Needle Valve
    18. Power Valve
    19. Power Valve Gasket
    20. Main Jet
    21. Idle Screw
    22. Idle Screw Spring
     
  4. bangerbob
    Joined: Jul 2, 2014
    Posts: 161

    bangerbob

    Thanks Junk yard kid!! Pulled plugs to check---found 2 that were gaped at .020----opened to .035 no stumble!! IMG_0399.JPG
     
    Marcia likes this.

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