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Thread: Frozen admission pipe

  1. 07-18-2021, 06:47 AM #1
    Xavier PJB
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    Frozen admission pipe

    Greetings,

    got a bizarre effect on one side/ramp of my rebuilt Weber 40IDS. One ramp is ok (cyl. 1,2,3), but the other one (cyl. 4,5,6) has water drops/ice on its manifold.
    Only changes before rebuild is I swapped the factory air filter to PMO air filters. (one on top of each ramp)

    Looks like the mixture is too rich, but rebuilt both side the exact same.

    Hence I reduced the air/fuel mixture to lean it and the phenomenon comes but looks less.

    I have sone thing in mind : incorrect float height setup or float stuck.

    Again, one ramp is fine, the other is frozen - carbs were running almost fine before rebuilt (they were dirty and needed some care) - no changes in setup.

    Any help appreciated.
    Xavier
    O-G 26 - Early911S 2407
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  2. 07-18-2021, 08:38 AM #2
    edmayo
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    what was the ambient air temp?
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  3. 07-18-2021, 10:06 AM #3
    Xavier PJB
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    Quote Originally Posted by edmayo View Post
    what was the ambient air temp?
    +25 Celsius Ed.
    O-G 26 - Early911S 2407
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  4. 07-19-2021, 11:14 PM #4
    Xavier PJB
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    Found the sources :
    - I cleaned carefully the carbs, and previous setup was done with dirty carbs. Hence "old" setup not relevant anymore
    - One float setup was incorrect, resulting in a overflow of gas, running faaaar too rich

    However, I setup again the float, back to factory setup and tuning. No more ice/water drops -
    Now tweaking with road tests (love that part)
    O-G 26 - Early911S 2407
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  5. 07-19-2021, 11:21 PM #5
    uai
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    Xavier get a double WBO2 Setup. I wouldn't want to do anything without it.
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  6. 07-20-2021, 12:01 AM #6
    Xavier PJB
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    Thanks Uli,

    Am now on the web site and try to understand the mass of information in there !

    Quote Originally Posted by uai View Post
    Xavier get a double WBO2 Setup. I wouldn't want to do anything without it.
    O-G 26 - Early911S 2407
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  7. 07-20-2021, 01:10 PM #7
    edmayo
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    too warm for icing, sounds like you're problem was fuel seepage.
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