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Webber IDF and IDA carbs

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FROSTY Insano Dub Head

744 posts · joined May 2009 ·

#872882
Hi There,
I'm curious, what the difference is with IDF and IDA carbs and which is the better of the two??
Looking at a new set for christmas..!
Thanks
Jason

Craig S Wolfsburg Wizard

635 posts · joined May 2008 ·

#872883
Here is the blind leading the blind...

I believe that IDFs have a better idle circuit and are therefore easier to live with every day and make more progressive power.

IDAs are more rough at lower revs, but I believe that outright they make more power than IDFs. Or more precisely, when matched with an appropriate camshaft and lifter combo, will make more power.

Therefore for any racing (drag or circuit) where revs will remain high and idle smoothness is not important, IDAs are the best option.

There are obviously those who are more than happy to live with IDAs on a street machine however.

Whilst IDAs in of themselves may not drink more petrol, when set up with the appropriate engine components to obtain the optimum performance, they can drink like a fish.

Let the corrections begin 👍
1969 Beetle - June
1974 L Bug - Gwendolyn
2002 Bora V6 4Motion - Anita

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 ·

#872893
IDFs come in 36,40,44 and 48mm

IDAs come in 48 and 51's (??)

Generaly speaking IDA = big
Futue te ipsum!!!

FROSTY Insano Dub Head

744 posts · joined May 2009 ·

#872902
Thanks for the Links!!! looks like now i just need to work out what size to get 44's or 48's

Sides Veteran Volks Folk

2,220 posts · joined May 2007 ·

#872904
General rule I've heard in a few places is 1600-1800, use 40's.... 1800-2000, go 44's and for 2000+ go 48's... and then go different size venturi's to fine tune to heads, cam etc.

Whatcha been running up till now ???
VWDCQ vice pres & web dude - vwdcqinc.org.au
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My toys
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snitz Wolfsburg Wizard

605 posts · joined Sep 2008 ·

#872907
What sort of motor?...capacity etc..Im getting built a 1916cc motor built at the moment for my wifes street bug and only running a set of 40mm IDFs with 40mm valves in her motor theres no point running 44-48mm carbies...besides losing airspeed and low down torque..speak to an engine builder I would suggest.

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#872908
😂😊😂


😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

FROSTY Insano Dub Head

744 posts · joined May 2009 ·

#872953
Hey Sides, I have had 40 dell's 32vents and they work fine. I am going to put them on to my 1600 street beetle and i'm wanting a new set for the drag bug.
1776cc, engle130 cam. I want to get the biggest carb possible incase i upgrade in the future. Probabliy best to go with 44idf.
Thansk
Jason

donn Wolfsburg Elder

3,515 posts · joined Nov 2005 ·

#872990
You won't get a bigger carb than the one in Mr. Mezz's 2nd pic above, about 600mm high I'd guestimate. 😂
I dream of a day when a chicken can cross a road without being asked for it's motive!

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#873026
donn wrote:You won't get a bigger carb than the one in Mr. Mezz's 2nd pic above, about 600mm high I'd guestimate. 😂

they are 48s
😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

zayus Wolfsburg Wizard

437 posts · joined Sep 2002 ·

#874402
they are 48s [/quote]

Just like the the Marlboro Holden Dealer Team used, back in 1979!

🙂