IDA Air Flow Between Barrels Way Off?

[markha]

I thought about the bent shafts. I also thought maybe I did not get some of the butterflys back in perfectly and they are not sealing as well as others. I am having a problem getting the idle low enough also. My initial time with the Demon was 20deg with the 35deg max. Now I seem to have to back this off to get it to idle lower than 1500 rpm. This may be one of the issues as well.

Then I started thinking that with the carbs on the car there are other factors that could be impacting the flow. Valves not adjusted the same seems like it might have an impact. I have hydraulic lifters, so this seems unlikely.

I think I am going to pull them and check all the butterfly. Then mocking up a quick flow test with a vacuum to get a base like before reinstalling them. This way the car and linkage is not involved.

Thoughts???

[*13*]

Let's see your fuel line setup. Where are you idle screws set? I can't imagine there being an idle problem unless there is something wrong in the fuel supply. How far off are these vacuum readings? How much fuel pressure do you have?

[markha]

Originally Posted by *13*

Let's see your fuel line setup. Where are you idle screws set? I can't imagine there being an idle problem unless there is something wrong in the fuel supply. How far off are these vacuum readings? How much fuel pressure do you have?

I am running an in tank EFI fuel pump with a return line to the tank. This runs up to a bypass regulator with a single and AN -6 line running up to one bank and looped to the other bank. I am running 3 to 3.5 lbs pressure. Idle screws all the way out. Some are worse than others but one is 10 in one barrel and 2 in the other barrel. I am going to pull them tonight.

[*13*]

Wow, that is way off. Something must be wrong. I think you're on the right track. Report what you find.