oldbogie said:The lowest power valve Holley makes opens at one inch of vacuum. The power valve can leak from a backfire even with a protection device in the carb. There's other sources of leaks, I'll get to that.
The powervalves front and back are new as of yesterday, no way are they leaking or bad just yet
We're assuming your wet plugs are fuel not oil or water, knowing this is most important. You can see, smell, and taste the plugs we can't. Black liquid out the exhaust doesn't tell us much. It could be raw fuel, a match ought to id that or not. It could be oil, in which case it will feel smooth and slick between you fingers and will probably not ignite with the match test. It might be dirty water. That and CO2 are the principle products of combustion so there's plenty of the stuff though it usually comes out the pipes in vapor form but it can condense and drip out. Plus it could be leaking coolant into a cylinder and pumping that out the exhaust.
It's funny you bring up water, cause the evac tubes fogged up while it was leaking the water so the temp outside might have been affecting the air in/out of the engine... I also ran the engine for about 15 minutes trying different stuff to make it idle right and so on... I started to notice that the base plate and spacers along with the manifold runners were starting to be COLD to the touch, not just cool.. COLD... Whats this a sign of?? I run 104 unleaded threw the motor also..
Certainly if the problem is oil or water then chasing the carb isn't the solution, so you gotta check this out and report back.
Im about 10% it's oil blowby, 80% it was water condensation and 20% it's fuel being rich...
The carb you have has 4 corner idle, that should be plenty to distribute the idle air and fuel requirement around to where none of the transition circuits are exposed. Nor should it be pulling any fuel out the boost venturis. If it's doing the latter the reasons are as follows:
It's not dripping fuel..
1) The power valve has failed and is leaking or the vacuum is so low it's turned on. All the carb's circuits feed from the main well. The well is fed by the main jets and the power valve. If the power valve is leaking (one can consider a bad gasket or a crack in the metering block or main body to also be a contributor to this) there will be so much fuel in the main well that changes in main jet size will prove to have no effect upon mixture ratio.
Powervalve isnt leaking unless the 4-6" is still to small for the 2.5" powervalve?
2) If the amount of fuel in the mainwell is excessive, the air correction jets will loose control of the emulsion process and can result in dripping boosters at idle. Same for way too high of a fuel level in the bowels.
I will try lowering the floats and get back with you on that.
3) If the secondary idle is not set properly the primary throttle plates can be too far open allowing the transition circuit to be exposed.
Whats the secondary idle?
a) In that case the idle and transition circuit will feed fuel making a rich mixture. The rich mixture causes you to open more throttle since the idle mixture screw is becoming ineffective.
I noticed that my 4 corner screws all the way in the motor seemed to run better? My old setup with a 750 it wanted to die when you run the screws in all the way??
b) The excessive amount of air flowing thru the primary side can cause the mains to turn on and drizzle fuel. What now happens to many tuners who find themselves faced with too much fuel, they close the idle mixture screws, or nearly so and open more throttle. You just get into this vicious cycle where you end up idling the engine too fast to try and burn too much fuel which is running out the boosters because of so much air going thru the venturis.
Any of this sound familiar?
You're running what for fuel, gasoline or alcohol? If alky, ethanol or methanol?
Was this carb set up for alcohol and is now running gasoline? Talk about being rich!
No it's a gas carb to my knowlage? It has the small metering plates..
You've got nitrous, does that system leak fuel when it should be off? Is it jetted properly?
Doesnt leak cause it's not on, jetted right...
You sure that stack of spacers is really air tight? Holley's are pretty easy to bend on a stack like that such that the throttle plate is bowed in the middle and not making a seal.
Yes, the good old carb cleaner test proved no leak there... I can install the carb strait to the manifold to satisfy this question if need be?
THANKS FOR THE REPLY! Please reply back