Somebody find me a chart of Weber jet sizes

Number to thousandths of an inch, please. I've been all through Redlines site, and can't find what I want.

Or, I suppose, just the math. A 32/36 has a 140 main jet, which is .056"...so what does the number mean?

Modern gas needs bigger jet.

I don't know that such a thing exists - at least I've never seen one. Braden notes that Weber jets are marked after they are drilled and tested for flow, which suggests non-standard sizing.

Which weber carb?

Also Main jet, idle or accelerator pump jets?

This might help though:

http://www.piercemanifolds.com/category_s/393.htm

32/36 DGV, main jets. I would presume the number/size should be common to all the different jets and air correctors, unless the numbers really are just a random selection.

I thought the jet number was the orifice size. So a 140 would be 1.4mm, a 165 would be 1.65mm, and so on.

Guess I'm wrong

They do.

"Weber main jet sizing nomenclature refers to the flow rate in hundredths of a millimeter (0.01mm). A 150 main jet, for example, flows the same as a perfect hole with a 1.50mm diameter. Larger numbers make the engine run richer from off-idle to about midrange RPM. Jets are sold individually."

What are you using the 32/36 on? I've got some jet maps for various cars the 32/36 is popular on, and could possibly give you a ballpark starting point.

I have the starting point, but its based on real gasoline, not the alcohol laced swill we have to burn now. B20 Volvo, 140/135 mains, and it had a horrible lean surge. I used my torch tip drills, and took the primary main from .055 (1.4mm) to about .062. Its almost perfect now, but still has a wee lean surge in certain conditions. I know its a sin to drill jets, so I thought I'd order some, but didn't know the sizing.

Not sure why I didn't think metric. Its Italian, ferchrissakes.

Something in the 160-170 range will work, and I think I'll jet the secondary about the same.

Thanks.

Don't forget to look at the air corrector size, that will fine tune the air/fuel ratio, which seems to be what you're trying to do. To tune a Weber carb you really should have the book that explains their operation.

I'd step down an air corrector jet before doing anything else. Fuel jets affect certain rpm ranges and throttle positions where as air correctors affect a broader spectrum.

Also, what psi are you running to the Weber? They like 3.5psi. And timing is normally advanced at base to between 12-15 degrees and 33-35 degrees all in at 3000 rpm.