Damn Thermoquads.
It has been a couple of days and each time I have gone out to start the car, it fires right up. I can't believe that something as simple as an operational choke made the difference. It has not been cold enough to need a choke...?
The closed choke door opens just a few moments after the engine starts. I can only figure that while it is closed, it forces the accelerator pump to work as opposed to a non functional acc pump with the choke door open during a cold start.
When the choke is closed, engine vacuum is applied to the 4 air bleeds, which then spew raw fuel on top of the throttle blades. Meanwhile engine vacuum is still trying to find air. It pulls extra hard on the low speed circuits, as the fast idle cam has increased the throttle opening. Meanwhile most carbs will engage the vacuum advance on the fast idle. This will provide the needed time in crankshaft degrees,to ignite and burn all that fuel.
As soon as the vacuum breaker sees vacuum, it opens the choke which stops all the spewing. Now you are on the transfers.
This it where it can get ugly. If you the reader, are one of those guys who insists on running 20* or more of idle timing,now the primaries will not be open enough to sustain the engines demand for fuel, and it may die. Typically the cure is increased fast-idle speed. Now the engine is screaming,but getting the fuel it needs; but now way too much air. Typically the cure for that is to close the choke. Which may start the bleeds spewing again, And so it cycles endlessly,
and the carb gets a bad reputation.
When all along the cure was LESS initial timing, and a fully functioning Vcan.
It is for these guys ( not necessarily you Kern), that I preach getting the T-port synced up. The sync will by default, demand the correct idle-timing.It comes out in the wash, no guess-work. When the sync is adhered to, the idle timing will always come in way lower than what one might think, which, with a typical street stall TC matters not one teensey bit. As soon as you step on it, in just a short time,the Rs might climb to 2000 or more where the timing might be 22 or more degrees, and if you are at any normal throttle setting this will combine with the 14 to 22 Vcan degrees for a grand total of perhaps 44*.So for guys running a typical streeter,with huge idle timing, and no Vcans, I'm sorry.
BTW, this message is not for Kern, but rather to future readers of this thread with such a provocative title; I'm sure in the coming years it will receive many hits from the search button.
Congrats
Kern on getting yours into the happy zone!
