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Technical 59ab is going to kill me

Discussion in 'The Hokey Ass Message Board' started by mr. h, Aug 21, 2020.

  1. So.... 47 ford stock flathead, dual 97’s-new, new rebuilt points carb From bubbas, all new fuel system, new tank-pump-lines. Will fire right up and idle fine, purrs actually. Give it gas sitting still and it stutters, drive it and it’s like it’s running on 4 cylinders and stutters, gets slightly better when I shift into second and flat out it’s a little better but still like the brakes are on. I have tried adjusting carbs lean to rich. 1.5 psi to 3 psi and everywhere in between and no change at all. It has all new wires and plugs and coil from bubba. I’ve read a bunch of threads and tried the propane trick and it’s not sucking air anywhere. Any ideas besides shoot or sell it all?


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  2. Dirty Dug
    Joined: Jan 11, 2003
    Posts: 3,653

    Dirty Dug
    Member

    What do the spark plugs look like? They can tell a lot about how an engine is running.
     
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  3. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,352

    el Scotto
    Member
    from Tracy, CA

    The brakes aren’t sticking are they? Some other kind of parasitic drag maybe?
     
  4. irishsteve
    Joined: Jan 10, 2017
    Posts: 839

    irishsteve

    Any chance a brake hose is gone bad inside,and holding pressure on the brakes? A bad rear would hold both brakes on.As far as the carbs do you have a primary,and a secondary? Two primaries would give you two acclerator pumps which would be too much.
     

  5. Aaron D.
    Joined: Oct 27, 2015
    Posts: 828

    Aaron D.
    Member

    A simple thing to do is check that fuel is coming out of all four ports of the dual carbs. Take off the air filters and look down each port while turning the throttle levers, you should see fuel coming out port, if not a jet is clogged. Also check each power valve is squirting fuel.
     
    jaracer likes this.
  6. jaracer
    Joined: Oct 4, 2008
    Posts: 522

    jaracer
    Member

    Find some old guy with an ignition scope and verify that your ignition is working properly. It only takes a few minutes. If the ignition is okay, start looking into the carbs as the problem.
     
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  7. Petejoe
    Joined: Nov 27, 2002
    Posts: 10,600

    Petejoe
    ALLIANCE MEMBER
    from Zoar, Ohio

    You’re right north of me.
    I plan to make the cruise-in there tomorrow afternoon.
    I’ll be driving a black 34 pickup with a flathead you can’t miss. If your around stop and say hi. Rick.

    Things to check. For a start
    Fuel pressure off idle.
    Timing advancing
     
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  8. clem
    Joined: Dec 20, 2006
    Posts: 3,000

    clem
    Member

    what brand of carbs, and how have they been set up ?
     
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  9. v8flat44
    Joined: Nov 13, 2017
    Posts: 555

    v8flat44

    Coil ?? I've seen a new Standard coil bad out of the box.....
     
  10. WB69
    Joined: Dec 7, 2008
    Posts: 1,322

    WB69
    Member

    Had one do similar things. Timing wasn't advancing. Cleaned and freed up dizzy and all problems went away. Just a thought...
     
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  11. That’s the way I am leaning however the dizzy is freshly rebuilt, can I adjust the timing using that screw on the side? And if so which direction?


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  12. I’ve tried a few different ones cause I thought the same.


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  13. Hey man!!!! My car will be there since I can push it there from my house. Purple 47 coupe. Which way do I adjust the timing? The psi is staying pretty much the same revved or idle. And if anything it’s running rich.


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  14. I honestly thought that at first so I put it on blocks and everything spins freely. I was disappointed haha


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  15. They are actually pretty black.


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  16. tubman
    Joined: May 16, 2007
    Posts: 5,228

    tubman
    ALLIANCE MEMBER

    Got a stock intake and carb? If all else fails, put it back on and try that. I don't mind changing intakes on flatheads since you don't have to drain the coolant or reset the timing. It's 15 minute job at worst.
     
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  17. Inked Monkey
    Joined: Apr 19, 2011
    Posts: 1,823

    Inked Monkey
    Member

    Have you checked the vacuum line to the distributor? Mine was doing that and the line was clogged. Would idle great but wouldn't rev.
     
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  18. No but I will.


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  19. ClarkH
    Joined: Jul 21, 2010
    Posts: 952

    ClarkH
    ALLIANCE MEMBER

    x2. Are these genuine Strombergs or the nortoriously problematic knockoffs?

    97s have a summer setting and winter setting. I think the idle is the same but winter setting delivers more gas on acceleration. Just a thought.
     
  20. Is it a dual point/dual coil ignition (like a Harmon Collins)? If so, you may be running on 1/2 the ignition (4 cylinders). I've had that happen a couple times on mine...both times it was one of the 2 condensors that failed.
     
    mr. h likes this.
  21. No it’s all single set up.


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  22. They are genuine, from summit so I certainly hope so. Where is this setting?


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  23. rusty valley
    Joined: Oct 25, 2014
    Posts: 1,786

    rusty valley
    Member

    if its a stock ford crab, they are duel point, and if it came from bubba it was set on a scope, so you should not have to adjust the timing on the side screw. that screw does not change much, you would hardly notice the change without a timing light. my bet is on coil. got good blue spark?
     
  24. LQQKER
    Joined: Mar 22, 2010
    Posts: 70

    LQQKER
    Member

    1st....bad condenser, 2nd.... bad coil....had them both .... Once that resolved , no power and after fire through exhaust....running lean. 59ab, 2 94s, blocked power valves.....started at 50 jets...runs well with 56 jets. Good luck
     
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  25. Dirty Dug
    Joined: Jan 11, 2003
    Posts: 3,653

    Dirty Dug
    Member

    If your plugs are black they're carbon fouled. That would indicate a weak spark and would act just the way you describe how your engine is running. That doesn't sound like a fuel problem.
     
    Last edited: Aug 22, 2020
  26. ClarkH
    Joined: Jul 21, 2010
    Posts: 952

    ClarkH
    ALLIANCE MEMBER

    Near the base of the carb where the lower end of the accelerator pump rod attaches. There are two attachment points labeled S and W for summer and winter.
    IMG_5131.JPG
     
  27. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,352

    el Scotto
    Member
    from Tracy, CA

    Thank you kind sir, you have taught me something new today. :)
     
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  28. WB69
    Joined: Dec 7, 2008
    Posts: 1,322

    WB69
    Member

    Taught me too....
     
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  29. clem
    Joined: Dec 20, 2006
    Posts: 3,000

    clem
    Member

    Yep, me also, but I’ve never played with ‘97s, just ‘94s.
     
  30. Petejoe
    Joined: Nov 27, 2002
    Posts: 10,600

    Petejoe
    ALLIANCE MEMBER
    from Zoar, Ohio

    Missed you tonight at Louisville.

    The 97 Stock jet size of 045 is too large for dual carbs. Try an .043.
    Power valves should be around #67.
    What have you done to verify you’re getting proper advance on bubbas distributor?

    .
     

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