CHINESE WEBER 40 IDF's

[Matt Biscotti]

I am working on a car for a friend. It is a 1972 Ghia. It came with a 1776 in it. The motor has compression the valves are are adjusted and the timing is set correctly on the bosch 009 distributor. My friend just bought the car, so I don't know the exact specs on the motor. He was told it has a w100 cam. The car with the idle by pass screws all the way in gets best idle with the idle mixture adjustment screws all the way in. This is with either.40 or .50 idle jets. With the .40 jets in and the idle bleed screws backed out 2 1/2 turns it idles really high. I normally just leave the idle bleed screws all the way in and jet from there. What would cause this condition? I am skeptic of Chinese Weber clones. Please advise-

[Stinky123]

I have no idea(r).

Your 7th sentence is sorta tough to decipher.

But, or course, screws all the way in means something is wrong....which jets is this with. This would tend to indicate that the jet is to big.

.40 Idle Jets and 2 1/2 turns sounds right. Can you turn the throttle stop screw in?

[Brian_e]

Is this a single center mount, or a pair of IDF’s?

When you said you set the timing “correctly” what is that? Most 009 distributors will need some tweaking of the advance stops to be correct, especially with dual carbs.

I find most dual carb engines prefer 10-12deg at idle, and 28-30 full advance.

Getting the idle timing up will help clean up the idle. 40’s also sound small. You might need to drill out the idle air holes, and then increase the size of the idles.
50-52’s should be about right for a mild 1776 with dual carbs.

Brian
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[Matt Biscotti]

BRIAN:
Thank you for the reply. The timing is 30 degrees when it is all in at about 3000 RPM.What size would you drill the idle air holes to? These are the air inlets in the top of the carburetors, yes?

[Matt Biscotti]

These are dual 40 IDF copies.

[oprn]

[BFB]

yeh that's it, guy doesn't understand his carbs well enough to know why theres an issue so recommend he drill holes in things.

air bypass can stay in, but if your idle mixtures are all all the way in ( closed ) something is wrong
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[oprn]

I could be wrong but I think the OP is talking about the idle AIR bypasses being screwed all the way in not the idle mixture needles.

What size are the chokes? That I believe is what matches the carb size to the engine is engine displacement and intake valve size as much as anything.
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[Dale M.]

IF Idle bypass screws are closed, this is normal, if idle mixture screws are all the way in and it still runs, that probably means he is on main jets and and needs to back down the throttle stop screws and open up idle jet adjustment screws.... OR insert And .40 jets seem to small....

One also has to wonder if one or both carbs may have butterfly's drilled....
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[oprn]

[Fender38]

[Brian_e]

[oprn]