Looking for some carburettor advice

[Jose M Oliva]

Hello.

I have two Solex 26/35 CSIC carburettors, one installed on car and another one that I have never tested. These are their characteristics:

Installed one (corresponds to a very late model, therefore a bit of mpg conscious): 
Primary venturi bore: 18 mm
Secondary venturi: 26 mm
Primary main jet: 102
Secondary main jet: 90
Idle jet: 39
Primary air correction jet: 1F2
Secondary air correction jet: 2AA
Pump injector: 1 (¿35?)
 
The one I have never tried: 
Primary venturi bore: 21 mm
Secondary venturi: 24 mm
Primary main jet: 120
Secondary main jet: 70
Idle jet: 40
Primary air correction jet: 1F2
Secondary air correction jet: 2AA
Pump injector: 40
 
My engine has the biggest compression ratio allowed by Tech Regulations and also the Club camshaft. Currently I am using the carburettor standard settings, but I believe there is some improvement available on this matter. My first idea is to switch to the second carburettor as it has more air pass, but I do not know what to do with the jets.

Does anybody have any advice about this topic that can be shared?

Thanks in advance and best regards,

José M. Oliva

[Paul Robertson]

Drill out primary fuel 102 to 135,secondary fuel to 95,1f2 to 130,2aa to somewhere between 130 and 160.this is the same regardless of which carb you use although i would tend to use the 21/24

[Dennis List]

I kind of got the same setup in my road 2cv. 9:1 compression and camshaft done by Kent Cams to be almost identical to the Club one.

I recently installed a 21/24 carb as well (came from a Dyane) after getting this tip from the Dutch racing team. I currently have 120 primary and 120 secondary jet and thought this may well be a little too much. But reading Paul's reply i understand we can go even bigger with the jets.

Do you also use an open airfilter (instead of the stock one?). I do, and that means a lot more air can be sucked through.

[Steve Panas]

open air filter gives too much noise on day to day basis ::)