1/25 Weber Side-draft Carbs wanted

['70 Grande]

I am looking for some 1/25 Weber Side-draft Carbs for a 4-cylinder engine "hop-up" project I have in the works... anyone have a pair in their parts box that they'd be willing to trade to me?  I am in Illinois... thanks!

[magicmustang]

Have these from a Revell 1/25 VW kit. Their yours if want them.

[Khils]

If I am not mistaken....(not a VW guru)... Flat 4's & horizontal 6's were all down draft.

[magicmustang]

PM sent.

[TECHMAN]

MARK

I may well have a pair of side-draft Webers, but will be this afternoon before I get back from a doctor's appointment (a few hours away).  If you still need a pair, will be glad to help you out.    Let me know.....

DJ

[Ace-Garageguy]

15 hours ago, Khils said:

If I am not mistaken....(not a VW guru)... Flat 4's & horizontal 6's were all down draft.

Correct.

Downdrafts won't work as sidedrafts and sidedrafts won't work as downdrafts, they look somewhat different because they are different, and anyone who knows Webers will spot the difference (even on a model) immediately.

EDIT: Unfortunately, that hasn't stopped a few kits from supplying the wrong ones for their supposed application.

And modelers please note: using a sidedraft as a downdraft (or vice versa) is as wrong as mounting a Holley 4bbl upside down.

 

Edited Tuesday at 02:32 PM by Ace-Garageguy
punctiliousness

[Ace-Garageguy]

Modelers also please note: while the ultimate high-performance Weber setups for inline fours and sixes use multiple sidedraft carbs...

  

...single sidedraft manifolds are also available.  

Manifolds for downdraft carbs are also available for some inline applications (2 examples below), though sidedraft carbs are usually preferred because they allow for straighter manifold runners.

      

Also note: there are both downdraft and sidedraft Weber manifolds for many V8 applications, and the carbs are NOT interchangeable.

    

Also note, my remarks are relevant to the ultimate high-performance Weber designs, not the carbs intended for moderate performance street applications, as below.

                                   .

 

 

 

 

Edited Tuesday at 06:07 PM by Ace-Garageguy
punctiliousness

[Khils]

1 hour ago, Ace-Garageguy said:

Modelers also please note:

Extremely Well presented!!  THX Bill👍

   Worthy of being Pinned!😎

Edited Tuesday at 06:01 PM by Khils

[Duane Garner]

Take a look at Texas 3d Customs website

[TECHMAN]

7 hours ago, Ace-Garageguy said:

 

EDIT: Unfortunately, that hasn't stopped a few kits from supplying the wrong ones for their supposed application.

 

 

Learned something today:  THANKS BILL for the lesson on Weber carbs.  Now, I can tell the difference by looking at them.  I had some that came in a model kit (that were said to be side-draft) but were actually down-draft......  Had some resin ones (side draft) that were cast by GARY DAVIS at the RESIN SHACK back 15-20 years ago (they were accurate), but was BILL that "set the record straight".  Have built (over 60+ years) probably 1000+ Holleys/AFB's/Quadrajets/etc.,  but never became well versed (nor familiar with) the Weber carbs.  Learned something new today, so the day wasn't a waste!!!!

DJ

[sidcharles]

RMCM also has both types

[Daddyfink]

Weber Side Draft are DCOE, and Down Draft are IDF 

Side Draft

Down Draft 

 

[sidcharles]

helpful information and great/ clear close up pictures; thanks.

Q: what is " DCOE" & " IDF"  ?

thanks

ps: if anyone would care to share a picture or link to connecting linkage, that would certainly make this thread the Weber trifecta. 

[Ace-Garageguy]

4 hours ago, sidcharles said:

Q: what is " DCOE" & " IDF"  ?

 

DCOE:   For Weber carburetors, DCOE stands for "Doppio Corpo Orizzontale", an Italian phrase meaning "Double Body Horizontal" with the "E"  standing for the specific generation. The DCO series carbs are all sidedraft, two venturi designs. Common DCO carbs include 40, 42, 45, 48, 48/50SP, and 55SP sizes, with the number referring a tuner to available replaceable venturis for the specific body casting.

IDF:  IDF stands for "Invertire Doppio", an Italian phrase meaning "Inverted Double", with the "F" referring to the fact that the basic design was introduced on a Fiat engine (in the mid 1960s). The IDF series carbs are all downdraft, two venturi designs. IDF carbs have been made in 36, 38, 40, 44, and 48 sizes, with the number also referring to a range of replaceable venturi sizes.

IDA: There are also IDA downdrafts intended primarily for racing that are not generally recommended for street use...which never stops anyone.

Weber designations and numbering can be confusing.

EDIT: There are other Weber carb designs besides the DCO and IDF/IDA series, but these two are the ones modelers will most likely be presented with. 3-barrel downdrafts for the Porsche 911 flat six (and some V-12 engines) are also fairly commonly encountered by modelers, in the IDA, IDS, IDAP, and IDTP models. And there are also carbs similar to various Webers from manufacturers Solex, Dellorto and Zenith.

Edited yesterday at 12:04 PM by Ace-Garageguy
punctiliousness

[Ace-Garageguy]

3 hours ago, sidcharles said:

ps: if anyone would care to share a picture or link to connecting linkage, that would certainly make this thread the Weber trifecta. 

There's no one-size-fits-all linkage setup for Webers because of the wide variety of possible applications.

The video below is a typical twin DCO-series installation.

 

[Ace-Garageguy]

DUH double post.  

Edited yesterday at 11:22 AM by Ace-Garageguy

[sidcharles]

awesome; thanks x 2

[Khils]

9 hours ago, Ace-Garageguy said:

DUH double post.  

Hey Bill, tried to PM you...says ur inbox is full.

[Ace-Garageguy]

1 hour ago, Khils said:

Hey Bill, tried to PM you...says ur inbox is full.

Sorry. It got kinda loaded up today.

I cleared a couple just now...and found one from you back in 2018 that it looks like I never responded to.

My sincere apologies, sir.

[Khils]

No worries Bill!

  

Edited 7 hours ago by Khils

[Chris V]

On 9/9/2025 at 4:27 PM, Ace-Garageguy said:

EDIT: Unfortunately, that hasn't stopped a few kits from supplying the wrong ones for their supposed application.

One of the most common examples being AMT’s 1963 Corvettes with DCOE side draft carbs on a downdraft intake.