20 - 30 hp Webers for injected 2v 308/Mondial | FerrariChat
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20 - 30 hp Webers for injected 2v 308/Mondial

Discussion in 'Mondial' started by snj5, Mar 18, 2007.

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  1. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    Russ Turner
    #1 snj5, Mar 18, 2007
    Just a quick informational post prompted by a set of 2v Weber manifolds with linkage on Ebay for $350. Based on my experience you'd pick up perhaps 20 - 30 hp, much much more if heads ported or carb euro intake cams.

    Here is an estimate of what it would take:

    Manifolds...............................$350
    4 NEW 40DCNF-12 @$300.......$1200
    Linkage pieces......................... $90
    Facet fuel pump........................$80
    Fuel line and filter......................$20
    Air cleaners.............................$120
    Gaskets..................................$100

    Total....................................$1960

    Could be done in a good weekend. No changes to the ignition system needed, and you would lose some weight from the FI. With new carbs, easier DIY maint. & parts.

    Just something to ponder...

    http://cgi.ebay.com/ebaymotors/Ferrari-308-intake-manifolds-linkage-weber-GT4-40DCNF_W0QQitemZ140096528394QQcategoryZ36474QQrdZ1QQcmdZViewItem
     
  2. 2NA

    2NA F1 World Champ
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    Dec 29, 2006
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    Tim Keseluk
    #2 2NA, Mar 18, 2007
    Good "hot rod" tip. Getting them jetted properly could be a chore if you don't have an assortment of parts and experience with Webers.

    Does anyone here have a good "starting point" for this?
     
  3. mk e

    mk e F1 World Champ

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    #3 mk e, Mar 18, 2007
    they are covering it right now on this thread
    http://www.ferrarichat.com/forum/showthread.php?t=142640
     
  4. mk e

    mk e F1 World Champ

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    #4 mk e, Mar 18, 2007
    A 15-20 hp gain is probably about where the carb conversion would come out. QV engine get 20-30 because the heads just plain flow better making the mild CIS cams work a LOT better than they do in the 2V heads.

    The 2vi cams are just as bad as the CIS, early carb cams to go with the carbs would be 30-40 hp. And those are the early cams 76-77, not the 78-79 cams which aren't any better then the CIS cams.
     
  5. snj5

    snj5 F1 World Champ

    Feb 22, 2003
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    Russ Turner
    #5 snj5, Mar 18, 2007
    I do think 20 is a pretty safe bet, with a VERY noticable increase in low end and throttle response that will make it feel like more (ask the former CIS 911 boys about this). I do think over 20 is possible with clever exhaust and intake strategies.

    I think wrt cams, it's the intake cam that is the important one - i.e. if you were pressed for $$, just replace the intake cam with an earlier or re-ground version. And, I'd really recommend removing the thermal reactor time bomb muffler if you still have it and replace it with a straight through free flowing dual system. I like Ansa and individually fabricated, but that's just me.

    From my jetting experience, I'd recommend:
    32mm chokes
    140 mains
    190 A/C
    55 idles
    F24 ETs


    If you go to the 8 cylinder dyno section of www.carobu.com, you'll see that the carb 3 2v liters can be tweaked really well.

    best
    rt
     
  6. smg2

    smg2 F1 World Champ
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    #6 smg2, Mar 18, 2007
    what a small world :) those are my parts, i separated out the whole shebang. as you know I ended up going with a supercharger so the 'carb' conversion has been sitting ever since. i have 'everything' to convert over to carbs except the cams. the carbs are NOS webers and I even have, but not listed, the original trumpets.

    If anyone wants the whole package just let me know.

    a local F-chatter picked up the Euro cams I had a few months back.
     

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