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Thread: Throttle stop carbs, any problems ?

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    Throttle stop carbs, any problems ?

    Any problem using a Dominator carburetor modified for throttle stop racing as a regular bracket race carb?

    Most I see have had intermediate circuit work to be crisp when coming back off the stop. Wouldn't that be good for a regular use carb too?

    I see conversions from 3 circuit to 2 circuit. What is the difference in that from a throttle stop intermediate circuit modification?

    What else is done to a name brand throttle stop carb and does anything else effect its use for wide open use?

    How about with a E-Z-Plate restrictor plate system?

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Location
    Florida
    Posts
    635
    Most of the time a correctly tuned 2 circuit Dominator works just fine for both bracket racing and throttle stop use. The only time it might be an issue is with an under carb stop with the throttle blades closed too far, too low of an RPM for the boosters to have a stable signal. With the carb blades at WOT and the stop blades partially closed the transition metering isn't supplying much if any fuel at that point either. I have had only one time that I've had someone with that issue, and I'm not entirely sure the carb was the problem. In that event a small amount of intermediate fuel might help. The boosters I use provide a better signal than standard Holley inserts, so even at lower RPM they still feed well. On a car with an inline stop I would have external linkage set up for 1 to 1, and with the carbs throttle blades functioning normally a 2 circuit would be my only choice.

    As far as the EZ plate, I would size the carb to closer match the largest restriction, but a good Dominator should work if the engine can handle a Dominator.

    As far as what others do, most I have reworked have the intermediate circuit way to rich for any engine, so hard to say what their throttle stop mods are...
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.


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