Weber emulsion tubes for PMO's

gumba · 09-10-2012, 05:48 AM

What model Weber emulsion tubes fit the 46 PMO's?

KTL · 09-10-2012, 06:08 AM

Harold,

I think you mean what's the Weber designation/type of Weber that equals a PMO. Its IDA.

But I wasn't sure if you were asking which "jetting" of e-tube to use. Typical 911 usage seems to be F3 or F11 these days. That said I have used F7 (currently) and F24 with OK results too. F7 has less holes than F3 and F11 so it seems it would be good for richening (less holes = less air introduced).

F24 more holes than F3 and F11, so that would provide leaner effect. F24 recommendations always seem to say "for very large main jets." My F24 setup was being used with 110 leaded race gas so it would make sense to need more air to lean-out the harder to burn high octane race gas.

Note that the location of the holes in the tube also has an effect on tuning.

1QuickS · 09-10-2012, 07:11 AM

I believe the PMOs use emulsion tubes, mains and air correctors that are common with the Weber, two throat IDA carbs.

gumba · 09-10-2012, 07:44 AM

Thanks, I ordered a set of F7's. I'm currently running F11's. I have a flat spot under hard acceleration around 3K with 55 idles. The flat spot goes away and has more pep with 60 idles. The problem is with the 60 idles is I'm running around 10.5-11 afr's at 3K.