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Old 19-12-2019, 06:59 PM   #1
davie_burtz
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Default Rough jetting sizes please

Just bought a duel weber 36mm idf set up (2nd hand)
Im stripping them down when i get them just wanting a rough jetting size for a 1776cc motor running 110 cam and 1.25 ratio rockers.
Just a starting point would be good, once running i can get a feel for what adjustments i need. I've had duel dells before but never played with webers.
Thank you
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Old 22-12-2019, 01:08 AM   #2
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Are you sure your carburetors are Weber 36 IDF's and not Weber 34 ICT's? If you have the 34 ICT's recommended jetting is as follows, MAINS 1.35 - AIR 1.60 - IDLE .60 - E TUBES - F76, these numbers will get you in the ballpark. Can't help with 36 IDF's, I've never seen them before. Fuel pressure should be no less than 2.5 PSI and no more than 3 PSI @3,400 RPM.
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Old 22-12-2019, 01:47 AM   #3
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http://www.aircooled.net/vw-carburetors-jetting-102/ A very good site.
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Old 22-12-2019, 06:43 PM   #4
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I’ve got 36 idfs, 1776, 110 cam and my setup is

135 main
220 air
F11 emulsion
55 idle

30 choke

Hope this helps
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Old 22-12-2019, 10:17 PM   #5
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Thanks guys, this looks really helpful
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Old 07-01-2020, 02:45 PM   #6
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My 1776 has 110 and twin 40's has

120 main
220 air
F11 emulsion
52 idle

28 choke

Pulls well up to 5500rpm
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Old 13-01-2020, 03:56 PM   #7
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HI, I am running Weber IDF 36'S on my 1200 (1192cc)

Choke 26mm
IDLE 57.5
ETUBE F11
AIR 220
MAIN 112
Pump 35

Just a note on the ALFA type 36s they have extra large idle air bypass bush (think this was done to help emissions
This means on the VW...you need to run a slightly larger idle jet to compensate for the extra air.....if they spit and pop at tickover, go up a size......Weber offer a half size, 50 was way lean, 55 was nice 60 was way rich, I settled on 57.5 (sold as a 57) this made good power all the way up to transition (ie 3000 rpm)
For main jet selection, for VW AC, good rule of thumb is to multiply your choke size X4.3.....You wont be far out...
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Old 13-01-2020, 04:29 PM   #8
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Thanks again guys.
I have stripped them down and found some weird emultions on mine they are F57s???
Ive read they are bit old school and were on the Alfa motors, gunna try them anyway but probably will need the f11s
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Old 14-01-2020, 09:41 AM   #9
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Yep F57 is seems to be a bespoke Etube for Alfa only....I suspect they did a lot of R&R with Weber to get the best performance but keep emissions / MPG under control, the SUD was a family car not a full on sports car....Read my last post on the AREA 1200 Performance pages

Anyway, F11 is a good Etube.....and seems to work on the VW motor rather well.
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Old 14-01-2020, 02:44 PM   #10
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Thanks pal, I'll have a read, sounds interesting
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