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Technical speedway motors Stromberg 97

Discussion in 'The Hokey Ass Message Board' started by kiteloop, Aug 13, 2018.

  1. kiteloop
    Joined: Sep 1, 2013
    Posts: 24

    kiteloop
    Member
    from chatel

    i have two new Stromberg 97 (from speedway motors) on a French flathead (4,2 liters)!!!
    when I fired up, have many detonations in exhaust !!!!the timing is correct , but I thing
    the gas is passing into the engine !!!i have some gas into the engine oil ( to much oil and oil is very liquid ) what is wrong with this carburators !!!!!
     
  2. deadbeat
    Joined: May 3, 2006
    Posts: 481

    deadbeat
    Member

    If there is fuel in your oil then fuel is definitely leaking(pouring) into your engine. I would start looking at your float and the needle valve, which is maybe stuck. I'm not familiar with The 97 and I'm sure someone will chime in. I have 94's and had the same problem with old original carbs but I changed to new made carbs and have no problems, touch wood.
     
  3. Unkl Ian likes this.
  4. big duece
    Joined: Jul 28, 2008
    Posts: 5,577

    big duece
    Member
    from kansas

    Fuel pressure regulator?
     
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  5. revkev6
    Joined: Jun 13, 2006
    Posts: 3,338

    revkev6
    Member
    from ma

    Have heard they are hit or miss. The floats can crack during adjustment and sink which will do what you describe. Pull the tops and check them first. Make sure level is correct. Then make sure you have the correct fuel pressure of 2-3 psi
     
  6. fortynut
    Joined: Jul 16, 2008
    Posts: 814

    fortynut
    Member

    I would make sure you have both needle and seats, as well as the flat that don't melt using today's gasoline. You also need to make sure the line pressure is between 3 to five psi. Get a regulator and gauge. Make damn sure to use a real filter with a disposable filter, preferably one of the canister models. Dirty fuel wreaks havoc on the delicate nature of carburetors. Also follow the advice of the poster who said make sure the float is not soaked, or if of the soldered copper style it does not have a leak and is filled with liquid. You should also have a board of jets, and a spark plug magnifier. Learn to read your plugs and have a couple of sets hotter and colder than the ones you have, now. A modified, and multi-carburated Flathead needs tinkering with to make it purr. And, yes, they are like cats. You can't expect to do exactly what you want, unless you romance them with TLC.
     
  7. tubman
    Joined: May 16, 2007
    Posts: 4,299

    tubman
    ALLIANCE MEMBER

    Are the Speedway "9Super7" carburetors rated to handle 5 lbs of fuel pressure? They may be, but I wouldn't run that much pressure with any regular "Ford-type" two barrel.
     
    X38 likes this.
  8. Blue One
    Joined: Feb 6, 2010
    Posts: 9,721

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Given where you live I’m really surprised that you have the Speedway garbage Stromberg imitation carbs.

    They might look right but they are poorly made junk.

    You could have ordered the good ones from Clive in England at Stromberg 97.

    Unless I’m wrong and you’re dealing with something someone else ordered.

    https://www.stromberg-97.com/
     
  9. Juggler
    Joined: Aug 20, 2010
    Posts: 77

    Juggler
    Member

  10. alchemy
    Joined: Sep 27, 2002
    Posts: 14,089

    alchemy
    Member

    Real Strombergs prefer 2 pounds. Not 5 pounds.

    Do you have real Strombergs you just ordered through Speedway, or do you have Speedway 9super7's?
     
    X38 likes this.
  11. dana barlow
    Joined: May 30, 2006
    Posts: 3,467

    dana barlow
    Member
    from Miami Fla.

    In order of most likely; #1 would be you failed to use less then 4psi or less pump or also no reg.{ I like 3psi my self}.#2 is crap stuck in seat for float,from you note cleaning your tank an lines out an having a filter. #3 float sunk or wrong too high adjustmint. After those it gets less likely but with cars anything can happen.
     
  12. revkev6
    Joined: Jun 13, 2006
    Posts: 3,338

    revkev6
    Member
    from ma

    speedway doesn't sell the real ones do they??
     
  13. lodaddyo
    Joined: May 5, 2002
    Posts: 1,105

    lodaddyo
    Member

    They do not. Only that chinese junk
     
  14. OLDSMAN
    Joined: Jul 20, 2006
    Posts: 1,809

    OLDSMAN
    Member

    Their carbs are off shore stuff. Take that for what it's worth.
     
  15. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 5,335

    Bandit Billy
    ALLIANCE MEMBER

    I bought mine from Clive in England, they are great carbs. I had to install a Holley 12-804 regulator to decrease pressure from 4 pounds to 2.5 pounds because I was having some of the issues you described. Perfect now! Try regulating that fuel pressure asap.
     
    Blue One likes this.
  16. kiteloop
    Joined: Sep 1, 2013
    Posts: 24

    kiteloop
    Member
    from chatel

    thanks for your help; I have a mechanical and original gas pump!!! I will try with a regulator, last year I have try this pair of carbs on an other flathead engine and had very bad results then I bought a new pair in England ,it was perfect
     
    Unkl Ian and Bandit Billy like this.
  17. The new real ones are “off shore” too technically?
     
    lodaddyo likes this.
  18. OLDSMAN
    Joined: Jul 20, 2006
    Posts: 1,809

    OLDSMAN
    Member

    The real ones went out of production years ago, now everything is produced overseas.
     
  19. Blue One
    Joined: Feb 6, 2010
    Posts: 9,721

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Yes but the English ones are great quality.
    https://www.stromberg-97.com/
     
    uncle max and 55styleliner like this.
  20. uncle max
    Joined: Jan 19, 2006
    Posts: 900

    uncle max
    ALLIANCE MEMBER

    9 out of 10 Chinese Hotrodders can't be wrong!
     
    X38 and TomT like this.
  21. merde chinoise bon marché
     
  22. I only just picked up on this pun.:rolleyes:
     
    Hotrodmyk likes this.

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