Quote:
Right. If the carb is adjusted correctly then it shouldn't matter if the PV is open or not at idle. If fuel isn't flowing thru the main circuit then it doesn't matter if the PV is open. Of course, it is better if the PV is closed at idle since you want it closed off idle and you want it closed until the engine starts to see a heavy load.
Holley messed this up years and years ago by using vacuum idle as a measurement point. Then the hot rod magazines made a mess of things by talking about engines loading up at idle due to open power valves.
A power valve with a hole in it will make a mess at idle since fuel will go into the intake manifold. But an open PV shouldn't change the AF ratio at idle by much if any.
Gotcha, I knew this at some point now that I think about it and forgot it.  I will check to make sure that the throttle blades are not open too far.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
| 
