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Thread: SECONDARY HESITATION

  1. #1
    Senior Member DYNO OPERATOR
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    SECONDARY HESITATION

    MY 750 HOLLEY HESITATES A BIT WHEN I FLOOR IT IHAVE BEEN GOING UP IN SHOOTER SIZE AND IT IS GETTING BETTER,IM CONFUSED I STARTED WITH 37 IN REAR AND NOW IM UP TO A 42.SHOULD I BE CHANGING THE FRONT SHOOTER ALSO? :?
    MOTOR IS IN 86 SS MONTE CARLO 3550 WITH ME IN IT,CHEVY 406 APPROX.500 TO 525 HP?,3.90 REAR,3400 STALL

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    Engine specs? Timing?
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

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

  3. #3
    Senior Member RACING JUNKIE
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    Bump your front squirter to a 42 also. You might try screwing out your idle screws a 1/2 turn or so. That will richen your idle alittle. I have also seen that the older 4150s have a solid screw in the squirter. If so get a hollow screw to replace it. That will let more fuel thru more evenly.
    good luck

  4. #4
    Senior Member DYNO OPERATOR
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    I CHANGED BACK TO A 41 ON THE SECONDARY AND WENT UP TO A 35 IN THE PRIMARY THIS TIME IT DIDNT HESITATE,THANKS FOR THE HELP MY CAR RAN 11.92 ALL DAY ON SUNDAY.

  5. #5
    Senior Member RACING JUNKIE
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    You may have to go down a little in the heat of the summer when the air isnt so good. Lots of times theres a 3000ft difference in adjusted altitude form mid summer to fall. When the air is good your idle circuit is a little lean. Thats why you needed more fuel.

  6. #6
    Senior Member RACING JUNKIE mopar1968's Avatar
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    Jet extenions?
    Head's up the true drag race!!

  7. #7
    Senior Member DYNO OPERATOR
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    I THOUGHT JET EXSTENIONS BUT IT DID IT WHILE IN PARK ON FLAT GROUND ALSO.

  8. #8
    Senior Member RACING JUNKIE
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    I don't know what your timing is set at, but you may be able to bump it up a little to help also.

  9. #9
    Senior Member RACING JUNKIE mopar1968's Avatar
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    Did you check for vacum leak's? this will cause this because of extra air entering engine.
    Head's up the true drag race!!

  10. #10
    Senior Member MASTER BUILDER
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    Your car weight is 3350 then a 42 shooter is to big u should be around 35 or 37 in the front and the back other wise u r wasting fuel is all....set your shooters tell you get best time then change your carb cam to another setting until it starts to fall away then reset your shooters.........my car with me in it is 2645 and i use a 37 shooter any bigger does nothing for me....weight of your car has alot to do with it as it takes longer to get a bigger car moving hence the smaller shooter will give you the same amount of fuel as a bigger one but over a longer period of time.....same with your carb cams they react with your throttle so the curve of them controls your shooter fuel............that is why they have holes in them to make them more agressive or to slow it down same reason the diffrent cams have longer or smaller rams to control the fuel curve to the shooters


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