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  #31 (permalink)  
Old 06-25-2012, 08:07 PM
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You can custom machine the mixture screws to get a different taper, and its not that uncommon a modification. However, I've heard it used mostly for radical cams that won't idle right.

Bruce

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  #32 (permalink)  
Old 06-25-2012, 08:20 PM
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Quote:
Originally Posted by LEROYDOZOIS
so after drilling the needle seats to .093 and backing the needles out to 6.5 turns its sitting at 16.5 at leanest idle. obviously thats not the greatest but its better then before, im assuming as it shows in my quadrajet book that id have to drill the ventures out.

by chance could i flatten or cut the mixture screws down to make them richer at less turns ? just a thought =/
I'm unfamiliar w/drilling out the venturis?

I'd caution you against changing the shape of the needles unless you have precision equipment to turn them down exactly the same, and to give them a smooth finish w/the tips centered. However if you have 10-32 thread idle screws, there are needles w/a medium long and short taper on them. If you have the long taper, the short taper screws gives more flow w/less turns. Long taper screws are also typically found on the later (~'79-up) Q-jets that have the finer metric threads. I do not know of any short taper metric idle screws.


Short taper, 10-32 threads


Medium long taper, 10-32 threads


Long taper metric threads

All that said, what is the idle quality like? What is the vacuum at idle? Using a meter to set the idle may not be the best way to go about this in the first place.
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  #33 (permalink)  
Old 06-25-2012, 10:17 PM
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boy oh boy...

i went and fiddled with all joints and rods looking for a vacuum leak and i discovered that the pirmary shaft has a worn area where the spring pulls it tight to the rear area of the carb, if i move it down itl flirt with the idle speed =[

i have the hardware for both the quadrajet and the 1406, maybe when the 1406 adapter comes in ill see if the afr changes any.

the quadrajet doesnt wanna idle under 1000 for the first few minutes until it warms up a bit.

im tired of carbs for the day =P
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