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 NigeType3
Officially Full-On Dubber
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| posted on January 31st, 2005 at 03:17 PM |
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40 IDF jetting
Hi all just got some 40IDF carbies and Im stating to pull apart clean up a bit before they go on the car. Before I order casket kit etc for them Id
just like to know what other dubers would jet these for a 1640 w/-engle 110 cam and mildle ported heads runing at 9.5 to 1 comp.
I also have thunderbird extractors as well if that make any diference and heads have std size valves.
I have a weber book to help as well just interested in first hand knowledge.
Cheers Nige:thumb
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Doug Sweetman
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| posted on January 31st, 2005 at 03:28 PM |
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Try emailing places like CB Performance and AirCooled.net in the states for advice.
From memory we talked to CB when we were looking at running the IDF's on my bug.
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 Bizarre
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The artist formerly known as blue74l
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| posted on January 31st, 2005 at 03:39 PM |
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Go to the library are try and get Weber tuning manual
Also get you self a synchrometer
The first part is selecting your vents. A 1640 should atleast be 32's.
28 are too small. If you check AC.net there 1600s update they sell changes the 1600 pre-jetted IDF kit with 32 vents.
Mains should then be 4.1'ish times the vent, so 4.1 x 32 = 131.
So I would go with a 130.
Airs are usually mains + say 50, so something like a 180 or 200
Idles are dependent on motor and aint really a measure of anything. MOST IDF's go with 50's but i was running 40s and 45's in mine as that was what
set the mixtures at 1 1/2 turns out.
In hind sight i should probablly have gone with 50's and just set the mixtures almost closed - the smaller idles blocked easily.
This is/was for say a stocked valved head. Could/would be different if you were running 50mm inlets 
Futue te ipsum!!!
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NigeType3
Officially Full-On Dubber
Posts: 371
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| posted on January 31st, 2005 at 05:09 PM |
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Thank guys thats great.
I have the weber tuning manual just wanted to hear from people with experiance for a bit of confidence in what I thought.
I am preparing an order to CB's at the moment with all the stuff I need.
Want to get jets & kit sorted first.
Cheers Nige
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