thru hub/prop exhaust, or dual exhausts

Discussion in 'Inboards' started by Bill55AZ, Mar 4, 2007.

  1. Bill55AZ
    Joined: Aug 2006
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    Location: Peoria, AZ

    Bill55AZ Junior Member

    I bought an old IMP boat for parts to fix an even older IMP boat, but mostly to get the trailer.
    Anyway, it has dual exhausts which go out thru the hull. The only thing stopping water from coming up is the rubber flaps on the transom penetrations. I suppose it is good enough, as the motor runs fine, but is this a good design for an exhaust or not?
    Last edited: Mar 9, 2007
  2. saabster
    Joined: Mar 2007
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    Location: UK

    saabster Junior Member

    most cabin cruiser exhausts are under the water or very can get a swan neck (water trap one way valve)to stop water ingressing too far up the long as the engine is well above water level shouldnt be any probs.
    Joined: Mar 2007
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    Location: Florida

    RMSOSF Junior Member

    General rule.... the top of the exaust riser inside the boat should be at least 12' - 18" above the water line, if it is, you are fine with your setup.
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