Running twin webers 40 idfs

Discussion in 'Carb/Tuning' started by prosnap, Jun 6, 2019.

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  1. Jun 8, 2019 #21

    one2dmax

    one2dmax

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    Looks good but need to work on your launching lol. Someone did one of these probably 15-20 years ago and I never got around to trying it myself. Would love to have the pics for my files if you would want to share? one2max@aol.com
     
  2. Jun 8, 2019 #22

    prosnap

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    I will post some more pictures of the setup stay tuned
     
  3. Jun 8, 2019 #23

    prosnap

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    Pics
     

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  4. Jun 9, 2019 #24

    one2dmax

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    Would you email them to me? one2dmax@aol.com
    Have wanted to do this for a long time but never got around to it. As parts get harder to get for these bikes might be a good option. I also debated making a single twin setup with larger throttle bodies (like the 44's) since that would flow more then enough.
     
  5. Jun 9, 2019 #25

    Fire-medic

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    Good pics, could you remove the air filters, and show close-ups of the carb-to-VBoost manifolds from different angles?

    Sean, I assume you would be using some stand-alone electronic fuel injection box & throttle bodies for that? A return line to the gas tank, and a new fuel pump probably would be needed, I suppose. I don't know enough about electronic fuel injection to know what pressure they run at. Putting O2 sensors in the exhaust to provide readings I assume is how to best tune it.

    "Never-mind!" (thanks-to Rosanna Danna Danna) I just saw your other thread.
     
  6. Jun 9, 2019 #26

    sandy klock

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    It appears the carbs are only off .150" per carb from center so all that is needed is a simple tube to flange and rubber connectors will give that much. Clearance of frame would be the problem.
     
    Last edited: Jun 9, 2019
  7. Jun 10, 2019 #27

    jedi-

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    I'd be keen to produce something if you're into it Sean, I have a couple of ideas
     
  8. Jun 10, 2019 #28

    CaptainKyle

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    My buddy has these on his Trike & seems to like them
     
  9. Jun 10, 2019 #29

    sandy klock

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    Hey Brother prosnap; what size venturies are ya running? I looked em up and all I found for 40idf,s were even numbers to 36. Seems someone would make odd numbers also and go to 40. Did i just not find em?
     
  10. Jun 10, 2019 #30

    one2dmax

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    For sure! We have some other projects going too but would be a great product to add to the list!
     
  11. Jun 11, 2019 #31

    Fire-medic

    Fire-medic

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    Doesn't the supercharged kit use a Holley 2-bbl?
     
  12. Jun 11, 2019 #32

    caseyjones955

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    I believe the correct carb for the SC kit is a Holley 390 4bbl, dunno if its a DP or not. I've been going back and forth for months with a local guy on a SC kit and thats whats in the boxes. It looks just like others I've seen for sale out of the area.

    Some of those Webers and Dells are capable of feeding a pretty feisty small engine, I would not be surprised if a DRLA 48 could feed a stock-ish max by itself.
     
  13. Jun 11, 2019 #33

    sandy klock

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    The idea of the Webers is 1 barrel per cylinder. When you start adding plenums you slow air mass, runners become unequal and all sorts of things start to happen. A throttle bore, runner, valve all reducing in size to increase velocity in air mass. A weber 48 would run a max venturi of 44mm, a very big hole, times two or three.
     
    Last edited: Jun 11, 2019
  14. Jun 12, 2019 #34

    prosnap

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    more pics
     

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