Like I said, I learned all this the hard way, and no one really had answers for me... I had to do a lot of research myself. The hard way..... meaning $$$$$$.$$$$$
If your taking the carb off, this is how you adjust the Idle....
( I now think the only way to set idle is with the carb off the car)
The transfer slots should look like squares from the bottom of the carb when they are adjusted properly. ( Period) Anything other then squares, then you will start to loose gas milage... and you will forever be trying to figure out why the outside ring on your spark plugs are always black no mater what you do to jetting, or IFR's or any other fixes.
The rear idle set screw adjustment should be between 1/2 a turn from fully closed to 3/4 turn from fully closed when your finished doing all your adjustments. You use the secondaries to fine tune how much air you need to mix with your idle circuit from the front. In reality, the secondary throttle plate position at idle will be adjusting your idle RPM's. Did the way I wrote this make sense?
The front throttle position should not be used to adjust your idle RPM's. If you do, you will go back to the bad gas milage.
Set the front idle screw to have a perfect square on the transfer slots and use the secondaries to adjust your idle RPM's.
Your 4 corner idle adjustments should be in a perfect ratio. 2: 1
Example: If the front mixture screws are 2 turns out, then the rear mixture screws should be 1 turn out ( from fully closed) Your final mix screw position will be different based on a lot of factors. But if the fronts are more then 3.5 turns out... you have a different problem that I can explain too.
It may take up to 1 hour to get this set correctly. Please take your time, and write down exactly what you do as you go along, incase you take a beer break...(wink)
All of the above will help your fuel milage and some off idle responce. It may not solve all your off idle responce....
Leave the fuel level in the bowls alone. It should be set per the way it should be set... just at the bottom of the site hole... and rock the car a little bit to make it spill out... then it is perfect. Anything else you are putting your carb out of balance, and will have to re-calibrate all your airbleeds again... we all know how fun that is....
I have even more info if you want to hear...( read....)
66 Stang 385 HP 302 .494 /.520 Roller, Edle RPM , Windsor Sr. C4, 750 DBP 74/84 jets, 34 Deg
[ This Message was edited by: Mikes66 on 11/7/06 6:46pm ]