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> Weber Jet Sizes?, Is there a "ballpark" starting point?
Porsche Rescue
post Jul 4 2003, 01:48 PM
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Can someone tell me the proper jet/emulsion tube sizes for Weber 40's on a near stock 2.0 (has "carb" cam but don't know specs)? So far I have only checked the idle jets and they are 45's. The engine runs OK but I think it could be better. There is a bit of a stumble at slack throttle around 3000 rpm. I think that is about the point of transition from idle circuit to main circuit. Any suggestions out there?
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krk
post Jul 4 2003, 02:41 PM
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Jim,

I have zero experience w/webers on 4 cyl's. But I've got a bunch of books -- got a /6 and had to learn somehow!

But I can offer data from charts on "DCNF and IDF jetting for air cooled vw engines" courtesy of the Tomlinson book. (I have a couple of others I can look at as well)

For dual carbs, they have idles at .55 down the (displacement) line for both carbs.

venturi - 28mm, mains are 1.55 for 2L+, air at 2.00, E tube is F24 for DCNF and F11 for IDF. P-jet (needle valve I believe) at .50.

Happy to look at more if it would help.

kim.
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