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DUAL DOMINATORS ON BLOWER MOTOR-idle too high

Old 08-03-2007, 04:17 PM
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Default DUAL DOMINATORS ON BLOWER MOTOR-idle too high

540/871.Dominators from a 900SC reworked by Chuck Nuytten.I or anybody else can't get the idle below 1100.All 4 idle screws backed completely off.All 8 butterflys are closing.They are boost referenced.Its a smooth idle but high.The carbs were worked on before i got them so i don't know what was done.HELP
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Old 08-04-2007, 07:02 AM
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Ideas anyone?
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Old 08-04-2007, 08:04 AM
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I'm no expert but is sounds like you may have an intake leak...running lean or the base timing is too high.
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Old 08-04-2007, 08:29 AM
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if all the throttle plates are closed, it has to be getting air somewhere, try spraying carb cleaner around all the carb matting surfaces and the intake, see if there is a leak.
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Old 08-04-2007, 08:49 AM
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Blowers will bend the throttle shutters when the pop thru carbs. Make sure they are closed and even. If your convinced you don't have a air leak the next thing to do is retard initial timing. Talk to your engine builder.
Jim
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Old 08-04-2007, 08:54 AM
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If the carb plates are drilled you may need to fill them,if you have 8 holes in them i would reduce it to 4 and try,if they are not drilled you have air leaking in somewhere,the new dominator carbs i have been getting from holley have really idled down real nice on na and blower application.If you cannot find leak you might have to try a different set of carbs
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