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R/T boy has covered it well. The mixture is less dense as cam overlap increases. More distance between the molecules; flame front takes more time to spread; hence more timing [ advance ] needed to get the most productive burn. With really big cams, up to 50* at idle may be needed...
3 psi fuel pressure is really not enough. Yes, the fuel bowls will fill with fuel, idle will be ok. In low gear, that fuel gets used up quicker than 2nd gear because max rpm is reached more quickly. The fuel level is dropping & may not getting replenished quick enough. A symptom would be putting...
You could also put a piece of thin wire in the secondary high speed [ main circuit ] air bleed to make it smaller. This will bring in the secondary fuel earlier. Very easy to do as a quick test, just secure the wire so that it cannot fall out.
I agree with post #17. Without v/valves in the secondaries too much air. On the carbs that had VVs, Carter incorporated an ingenious starter cct. When the secs went to WOT, the upper edge of the VV was adjacent to a small orifice in the booster that supplied 'start up' fuel for secondaries. Your...
Lemon,
I agree! But finding a TQ in good condition & getting it running can be daunting for those not aquainted with the TQ. So next best is the Edel carb which comes with comprehensive tuning instructions....
The AFB carbs do not have an air valve in the secs like the AVS, but they DO have velocity valves between the boosters & the t/blades.
There were a number of different VVs used, that varied in the attached counterweights & 'angle of attack'.
The VV control the sec system. Jon Hardgrove, of the...
Semiconductors in the ECU can suffer from something called thermal runaway; basically, they overheat & their electrical characteristics change. They can return to 'normal' when they cool down.
If an ign coil is used with a low pri resistance, say 0.5ohms, then the power transistor in the ECU...
Have not read all the replies. Has the vac adv been hooked up? Every time the VA deploys, it flexes the p/up wires. Eventually the wires break.....& no spark.
I would try a new p/up or different dist.
This thread is a great example of where a little knowledge is dangerous....
OP, you need to get some help ON SITE from somebody who knows Chrys ign systems.
Also, you will need a LOT of timing at idle, with either cam; if you keep the current cam, you may need as much as 35* at idle. Yes 35* !!!! Maybe more. Easiest way to do this is using vac adv connected to manifold vacuum. Choose, say 15* initial & add 20* with vac adv. See below