holley 1920 carb question
Hi, related to this, from diagrams of holley carbs, there is an air emusifier tube in the jet well that is usualy vented to the venturi throat or up to top. If I look into my 1920 there is the accell pump squirt hole and right next to it a dimple that might have been (?) a tiny air inlet hole. ?clogged over? Probing these passages , jet block side with block off, with wire, ones finds the squirter but the other one takes a 90 to where? Turns sort of upward. I think it is the air bleed inlet? If the air bleed for idle is blocked , you get no emusifying so badly screwed up idle? where does idle air intake for emulsifier come out on the main body ? Also related, comparing two 1920, the throttle plate on one shows a bit of vacuum advance port ,that will advance ignition. Not supposed to be open at idle, fit of plate etc is all factory, looks good but not covering advance port--on one. . Its supposed to be covered--- right-- at idle? if not ----advance moving at idle could cause erratic rpm.
On discussion of bowl vent , it is vented anyway direct to air into venturi top , (that pressed in metal pipe cut at 45 goes straight right into it !) , into the chamber where the poppet valve opens at idle , and the larger line from cannister. So not having charcoal thing connected does nothing to anything ? It looks like idea of all that is when engine is running a slight vacuum exists in there sucking vapor into venturi, from bowl and from cannister . Or runs other way air and vapor into cannister?---- Note that there is second real vacuum line to cannister at bottom of carb, , maybe that sucks out both vapors, and gas tank too. stored in cannister from bowl (poppet is closed driving along) but end of day, the upper large pipe/ hose is just going to air cleaner air in throat ,all the time . With poppet closed , engine off, hot soak vapors would end up in carb, gets pulled in when you start , or back to cannister, once vacuum...in smaller line at bottom
One more thing, one of my 1920 "rebuilt" had power valve gasket on top of power valve, I looked into that , that is wrong (see sheets) if you do that power valve is set too deep into bowl, it is holding open the enrichment balls. Also 58 jet is like 100% better.
Sorry for bold, not sure why