Tim,
Sorry, I did not follow any of those earlier carb threads. I have never really followed them...I guess I need to now! It always seems the problems you face in life are in the area you need to study the most.
I think the carb is an 850, but the more I think about it, the more I don't know. Like I said, Thomas has always been in charge of the carb department and I wasn't smart enough to pay attention. How do you tell what kind of carb you have? What should I look for?
I do know the following.
4 idle mixture screws.
Air horn has been milled off.
Manual secondaries
No choke.
Base idle is about 800-900 rpm
Aluminum Edlebrock heads
Cam unknown, but not too radical. Nice street motor. Power on the dyno starts to fall at 6500 so it can't be too radical.
91 octane fuel.
9.5:1 compression
I didn't do the distributor, engine builder did. I know the springs are probably a little too stiff as the advance is a little late for what I would think.
Any suggestions on when full advance should come in? Full advance is set at 35 degrees right now--around 4000 rpm.
I am not sure what the idle timing is...I didn't check it.
The car ran fairly well, but progressively went down hill. That is why we suspected the distributor was phased wrong. We checked the rotor and surely, the burn on the rotor was on the trailing edge. The coil contact on the cap was completely burnt away as well. Changed the cap and rotor.
A lean stumble makes me think the power valve is toast. The carb is a brand new Holley, so maybe it has the blow out protection. How do I check if it has the protection? How do you check a power valve?
I fooled around with the fuel mixture becasue the car died under hard braking. The fuel mixture needle is now 3 1/2 turns out on the back and 1 1/2 turns out on the front. That is the only way the car won't die under hard braking. All that was done according to the engine builder's suggestions. I do trust the engine builder, but he is a long way away and trying to help from a long way away. Of course, you are too, but as we write things down, there is a certain amount of thinking we have to do as well. BTW, I truly thank you for your suggesitons and time.
Fuel bowl level has been set to the screws. Just barely will run out if you slightly jiggle the car.
Main complaint is the stumble on acceleration and the seeming miss at all rpms. Seems to be low on power.
John,
Looking forward to seeing you. When do you think you will be in?
Fuel pressure is 6-8 psi always.
David
