Emulsion tubes the deepest dark secrets of Webers

I have read Braden's book and would like any experience or advice on Weber emulsion tubes. I have heard everything from they are not that critical to Pierce Manifolds (Mike) admonishment to me today: "They are the heart of the carburetor"!

Any practical examples? - The Braden book is a little short on examples. I know the numbering system is haphazard. I have ordered the F36s that were in the 308s empirically because that is what Ferrari used, not because I really understand.

These are the final frontier as I try to better understand Webers.

best
Russ

Hi Russ,

I don't know about being "the heart" of the carbs, more like the soul imo...

go with what cha got...gotta start somewhere.

Regards, JRV

Hi Russ,

Emulsion tubes..."the heart"???
I'd say that they "set the personality of the carbs" would be a better choice of words. The book "Weber Carburettors" by John Passini goes into some detail as to how various tubes function and differ from one another.

An interesting read, for sure. Enjoy!

Regards,
David

This is great info.
Will see if Santa can bring the Passini book.

Will swap out the current 150/F24/190 + .6 idles that were soo very rich. Plan on next dyno with 145/F36/200 with .5 idles whenever they get here. Will have backup of 140/F36/220 if too lean (can mix and match depending on mixture strengnth up high).

F24 - stock 40dcnf-12 used in Fiat Dino
F36 - stock 308

The 36mm chokes are backordered so will hang with 34s.
Am curious to see what 32s do, but will resist temptation.

How much effect do idles have further up in the range after transition? Any?

My experience with DCOE 40 Webers shows float level to be crucial in the proper performance of emulsion tubes. Different characteristics occur between low and high settings according to my Weber book.
Dark and Mystical indeed, especially the numbering system!
DJ