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Technical CB performance intake

Discussion in 'The Hokey Ass Message Board' started by Kevin Ardinger, Sep 11, 2020.

  1. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
    Member

    [​IMG]
    Anyone have any experience running this combo. I own one that I want to try. All I know about it is to keep the fuel pressure about 2 psi. Aside from that I’d be winging it.
    Thanks


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  2. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,802

    jimmy six
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    That’s really neat...
     
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  3. Budget36
    Joined: Nov 29, 2014
    Posts: 13,174

    Budget36
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    X2, looks sweet
     
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  4. I also own a 65 VW with dual 44 IDF Webers. I haven't gotten it running yet, but I know from research that the webers can be finicky and need expert adjustment. Also, they will run twin 48 IDAs on a 2 liter VW engine, so I'm wondering if 2 webers would be enough carb for an SBC?? I don't know the answer.

    You question probably has less to do with the intake manifold, and more to do with the ins/outs of running webers on a V8
     
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  5. Looks like the top of the carb are missing.

    If you're going to do it, might as well go all in.
    Not Mine, but a cool set of DCOE45's
    Webber-1.jpg
     
  6. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
    Member

    That is actually not my setup. Just a picture I had. I kinda understand the Weber concept on each port. Not sure how they will run on a plenum.
    After checking the picture again those carbs are complete.


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  7. miker98038
    Joined: Jan 24, 2011
    Posts: 1,143

    miker98038
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    Those don't look quite right to me either. But if they're Weber's...

    IIRC Inglese has been doing Weber's for years. Problem worth a phone call. Done right, they're great, I've run them. Done wrong, it's a nightmare.
     
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  8. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
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    I do not believe that these are on a plenum. I believe that each barrel services only two cylinders.

    If, and only if, the runner design is correct in the manifold, then this is still essentially individual runner.

    If one barrel services two cylinders that are as far apart as possible in the firing, and thus intake order, then each barrel is effectively just feeding that cylinder, at that given moment.

    With 4-barrels to choose from, spread across the length of the manifold, this should be do-able.
     
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  9. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
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    If we labeled the barrels front-to-to back as A-B-C-D, working with the given firing order of 1-8-4-3-6-5-7-2, then the cylinder service order could be:

    A: 1,3 (separated by 8 then 4)
    B: 2,4 (separated by 1 then 8)
    C: 6,7 (separated by 5)
    D: 5,8 (separated by 7 then 2)

    It is not a perfectly even scheme, but it should work. A small balance passage would take care of any remaining flow issues.
     
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  10. gimpyshotrods
    Joined: May 20, 2009
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    gimpyshotrods
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  11. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
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  12. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
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    Do you know what size the carburetors are? How big is the engine?
     
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  13. joel
    Joined: Oct 10, 2009
    Posts: 2,467

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  14. gimpyshotrods
    Joined: May 20, 2009
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    gimpyshotrods
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    It would just move the uneven separation from the C barrel, to the B barrel.
     
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  15. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
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    Pretty sure they are 48 ida’s. Haven’t actually identified them yet. 358 cid 9:1 lunati solid cam. Currently have three Rochester setup.
    Thanks


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  16. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
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    If, and it has been a long time since my VW days, my memory serves:

    40s are 212 CFM, 44s are 290 CFM, and 48s are 340 CFM, with no modifications to the venturis.

    On IDAs, and some others, the venturis can be replaced, so, unlike most carburetors, you can tune the flow too!

    Stock venturis in 48s are 37mm, with 40mm and 42mm replacements being common,
     
    Last edited: Sep 11, 2020
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  17. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
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    I spoke with Jim Ingleese a year or so ago about a 4 Weber setup but didn’t want to spend 4500 bucks. He said something about “ choking them down “. I think that’s what he meant.


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  18. gimpyshotrods
    Joined: May 20, 2009
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    Yup. The vernacular term for Weber venturis is "choke". A whole lot of folks call them chokes.

    Back in the days when both Jim and I both still lived in Connecticut, I worked just up the road from him.
     
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  19. A lot of English terminology refers to barrels or ventuis as chokes. As in 2 or 4 choke carburetor.
     
  20. They are IDF series, not IDA :cool:
     
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  21. fabricator john
    Joined: Mar 18, 2010
    Posts: 305

    fabricator john
    Member
    from venice fl.

    those may be delorto carbs drla i believe ,,get a book from cb or other vw companys , pending they are EXTREMELY adjustable , venturis air circuits etc.. can be ultimately adjusted for idle.in ethwe middle and on top plus progression rates , just put yourself on the big learning curve and dont give up !!!! i know a few things ,one they are a isolated runner carb, and two if ya have two cyls per barrel the carb thinks thats a plenum,, so you will have to figure it out ,, when you zing this type a carb they mist above the stacks so dont let that thing you are too rich ,, i have a friend with this exact setup ill ask him if he ever got his going ,, 2,5 to 3 lbs max for sure and air cleaners are easy as will be parts , check classifieds on a vw website called the samba there youll find jets venturis air correction jets everything basically their classifieds is big as ebay so its all there ,,, have fun
    ps the jet stacks just unscrew out of the top make SURE THEY ARE CLEAN the main is on the bottom theren theres a idle air and a air correction i think is the top one theres three pieces that click together if my memory serves me right they click together as a stack after ya unscrew them .smiles for miles
    fabricator john
    miss you dad
     
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  22. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
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    Good eye.

    Chokes can be changed on those, too!
     
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  23. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
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    How do you tell the difference?
    Thanks


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  24. gimpyshotrods
    Joined: May 20, 2009
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  25. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
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    Ok thanks. They definitely say made in Spain on them. I’ll check the I’d numbers this weekend.



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  26. IDA’s are way bigger than IDF’s...CB was a big proponent of Dellorto carbs for VW’s. I had 45’s on my 2017cc and it was a good runner..and 48 IDA’s on my 2275..and it really ran..
    C94A1B7D-4058-4A73-8DB3-28C91A04A41F.jpeg
     
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  27. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

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    I had 40 Dells on my 1835. That thing was alarming.
     
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  28. carbking
    Joined: Dec 20, 2008
    Posts: 3,715

    carbking
    Member

    Experience with two OT factory setups, both ran like scalded dogs!

    (1) 1600 cc (97 CID) 4-cylinder - pair of twin 40's
    (2) 2000 cc (121 CID) 4-cylinder - pair of twin 44's

    I AM NOT A WEBER EXPERT! But believe I would rather start with four rather than two on an SBC.

    Jon.
     
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  29. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 778

    Kevin Ardinger
    Member

    Just getting back to looking at this intake. Those carburetors are definitely on a Plenum. That’s what I wanted as I’m running an automatic and need a vacuum source. By the way, they are 40 idf carbs. Kinda small I guess but it’s a very mild sbc.


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