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  VW Parts Catalog > Carbs & Fuel System >

Weber IDF & DCNF Idle Jets, 74405
Weber IDF & DCNF Idle Jets


 
Aircooled.Net only carries ORIGINAL Weber JETS FROM ITALY, we do not carry Chinese reproductions which do not flow properly! These are all genuine Weber jets which have been flow tested at the factory.

Jets are sized in "milimeters", so a "50" jet is very close to .5mm. Actually they are rated on flow not size, after they are measured on a flow machine. That's why drilling and reaming jets is not necessarily a good idea, since drilling or reaming can result in a 55 idle flowing more than a 60 idle, based on orifice length and entry/exit radius, etc.

Price: $8.00
Item eligible for Econo/1st Class Mail shipment, min ship charge applies

: 74405

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Aircooled.Net only carries ORIGINAL Weber JETS FROM ITALY, we do not carry Chinese reproductions which do not flow properly! These are all genuine Weber jets which have been flow tested at the factory.
Item Features
We are aware that we are a little more expensive than other suppliers of Weber jets, but here is why you should use Aircooled.Net. First, we only sell genuine Weber jets from Italy! Secondly, we will tell you the correct jet sizes to minimize your jet expense, and your valuable time tuning! Other shops that aren't proficient at Weber Tuning will be happy to sell you jets at $4 ea, and you'll wind up with 6 sizes (24 jets) that you don't need! That makes no sense! By buying from us you will not spend more than you have to, our experience will keep your costs down, while providing the highest quality parts.

With that out of the way, we recommend the following idle jet sizes for sea level driving for dual DCNFs and IDFs.

40mm = 47.5-50

42mm = 52-55

44mm = 55

48mm = 57.5-60

Drop the size "1" for every 1k' rise above sea level. So if you have 40 IDFs, in Denver (5k') you'd need ~42.5-45, but the same carbs at sea level would use 47.5-50.

Despite what you have read in "other" places, these sizes will result in the best running (cool) and stelr MPG. Use the main circuit for your power tuning! Read our tuning guide for further tuning tips, you'll save a fortune by buying the jets you need ONCE without guesswork!

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 1 Add your review too!

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  3 of 4 people found the following review helpful:
 
5 of 5 Idle jets December 13, 2012
Reviewer: thomas Scott from torrance, CA United States  
I have dual 40 idfs on my 1776cc, got them set up by my local shop and they just never felt right, seemed sluggish. I used aircooled.net's jet selection chart came up with a 50 idle jet. It solved it my engine is running great i have better mileage and my throttle is crisp!! Btw i live in cali so even with our gas out here yes 50's are better than the 55's  most shops say to use, for dual 40's.

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