Jetting for 32/36 weber

[warrenrhen]

My rend just mailed me a weber 32/36 DFEV he had it on a IT race car but rthere are no main jets in it. What would be a good size to start with for my 2.0 whitch is stock except for headers and single plain manifold?

[Nut124]

If it's been in a race car, you might want to remove and record all jets and venturi sizes.

Racetep.com has basic jetting for all Weber carbs.

https://www.racetep.com/webercarbjet.html

How close are the rest of the jet/vent sizes to the racetep list?

[18Fiatsandcounting]

A good place to start with these types of Weber carbs on a Fiat engine is a 135 main jet and a 170 air corrector, and then go from there as necessary if there are flat spots, running too lean or rich, running at higher altitudes, etc. And I see that this is indeed about what the website pointed out by Nut124 suggests. (A good reference, by the way)

As for idle jets, that takes some experimentation, but basically you want the idle jet to be sized so that the engine runs the smoothest when the idle mixture screw is screwed out about 1.5 to 2 turns from seated (don't seat the screw too hard). If you have a flat spot in the transition from idle to main jet circuit, go up in idle jet size one or two steps.

As for emulsion tubes, that's way beyond my ability to assess what's best. Either use the table in the website, or use what came with the carb.

-Bryan