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10-29-2017, 11:13 PM | #1 |
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Qjet idle rich.
GM 1980 305 w/ stocker cam, 2-3 inch vac.
I cant get a good idle, it loads up and it falling over about 90 ft. out then pickup a sec. later. The carb was built by a local SS racer a few years ago. It has the pri. rods removed. I have to have the throttle open a lot of turns to keep it running. The fuel is being pulled from the mains and the idle screws have little affect. I have tried other Q jet carbs, even a new Jet stage 3. I guess the question is, how do I get this to run right. |
10-30-2017, 08:50 AM | #2 |
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Re: Qjet idle rich.
Fuel pressure?
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Todd Greene |
10-30-2017, 09:38 AM | #3 |
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Re: Qjet idle rich.
Fuel pressure
Started at 7psi I how have it set at 3.5psi. Float is at 1/4 " , have changed float and needle & seat. |
10-30-2017, 10:31 AM | #4 | |
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Re: Qjet idle rich.
Quote:
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10-30-2017, 11:02 AM | #5 |
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Re: Qjet idle rich.
Did any carb ever idle on this engine??
Are the primary blades drilled?? 2 or 3 inches of vacuum is nothing?? You might have engine problems and not carb problems.. Such as vacuum leaks, cam timing, damaged valves or too many to list.. Just sayin'
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Bob Mulry 7516 STK A & M Motorsports Last edited by Bob Mulry; 10-30-2017 at 11:04 AM. Reason: Spell check pos |
10-30-2017, 12:15 PM | #6 |
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Re: Qjet idle rich.
Carb worked on bracket 350. but w/ south a year later. Have rebuilt ,cleaned and blow it out. but has no
I have tried 3 other carbs on the 305. problem on 3 different motors, all low vac motors. smoked all the motors, no leaks, leak down good. plates drilled. the motor will run with a Holley. put a Jet 3 on this motor and still the same. |
10-30-2017, 02:27 PM | #7 |
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Re: Qjet idle rich.
Are you sure you have the right gasket between the carburetor and intake manifold?
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10-30-2017, 03:04 PM | #8 |
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Re: Qjet idle rich.
I have looked at the gaskets but, I maybe should look at that . thanks
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10-30-2017, 04:05 PM | #9 |
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Re: Qjet idle rich.
Yes to this...there is a base gasket out there that is the mirror opposite of what is needed. Will cause a huge vacuum leak for sure.
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Rich Taylor I/SA - 321 |
10-30-2017, 11:16 PM | #10 |
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Re: Qjet idle rich.
a huge vacum leak will cause it to be rich? I thought I would make it lean...
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