Interesting Weber jetting

[jonalley]

I'm new to this whole tuning and get very confused by the multiple names used for parts-e.g. the brass valve at the bottom of the float bowl on a 48IDA is the pump exhaust valve (that's from the Weber exploded image I have). I think it get called a bypass valve by its action. To call it other things hurts my head.
Eljaro, You really must write a book. I'd be the first in line to buy a copy. Regards, Jon

[Gaz64]

The "pump exhaust valve" is really a two way valve.
It allows fuel to enter the pump cylinder, hence "inlet valve" but as the pump operates, fuel will return to the float bowl until the inlet ball seats, hence "exhaust valve" even as a "00" valve.
A valve with a 0.35mm, 0.50 orifice on it's side bypasses fuel back to the bowl while the ball is seated.

A light spring with a closed "00" exhaust and 40 pump nozzles would give a long duration pump squirt.

A heavy spring with a "60" exhaust and 80 nozzles gives a short sharp squirt. Both extreme examples.

DCD, DCOE, IDF, and IDA all run this valve at the bottom of the float bowl.

The float on an IDA has to be removed to change the valve.

The valve is easier to change on the other carbs because the float comes out with the float lid, (airhorn).

[PaulProe]

Eljaro
Trying to decipher all your work and not sure where you ended up with final settings. Are the e-tubes F7, F11 or modified F11?

Did you update post #1 and is that the various components you are now running or is it what you started with?

If it is not the current ones, would you mind reposting

Starting my journey down the Weber highway.

Thanks

Paul

[Eljaro]

fine tuning goes on and right now I have these settings:
choke 40
main 160
emulsion tube the modified F7 you see in the latest photos
air 150
idle jet 75
idle air 120
pump bypass .50
idle screw 1 turn out

shoots very little black smoke now on hard accelleration with no bogs,
running a little rich according to AF meter but plugs are tan.

[PaulProe]

Originally Posted by Eljaro

emulsion tube the modified F7 you see in the latest photos

Eljaro,
Any tips or details on the modifications to the E-tube? details on spacing or size of holes?

Paul