Thermoquad........Ok AJ, WHAT NOW?

Hi Folks

So I have a 1971 318 set up on my run stand with a 6139 Thermoquad.

I rebuilt the carb, and adjusted it. On my stand, it purrs like a kitten at 690 RPM and 20 inches of Vacuum. Carb and engine adjustments are as follows.....

Air mixture screws 2 1/2 turns out
Idle timing 10* BTDC
Idle speed screw out 1.5 turns from throttle valve seated. (shows a little t slot. Looks like 3 turns gives approx .030 exposure)

So, how would I increase idle timing and/or T slot exposure without getting the idle RPM up too high? Thinking about this since the carb will eventually be on my 340 Demon. Worried about tip in sag or anything else that may present itself.

Eventually, this carb will be installed on my 340 for break in, and beyond.


*****AN ASIDE***** Strange, the vacuum nipple closest to the pull-off yields no vacuum, while the one just to the left side of it has vacuum. Both fittings look like they get their vacuum from between the secondaries below the throttle plate, and both passages are clear???? :wtf:

@AJ/FormS
@Bewy
@RustyRatRod