Water Ingestion Into I/o Merc Engine

Discussion in 'Powerboats' started by Boatwiser, Sep 22, 2015.

  1. BMcF
    Joined: Mar 2007
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    BMcF Senior Member

    Whether fresh-water (closed loop) cooled or not, the raw water is still injected in to exhaust flow at exactly the same place and manner on the vast majority of such engines; via an inductor ring in the manifold riser or exit elbow.
     
  2. powerabout
    Joined: Nov 2007
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    powerabout Senior Member

    yep and on millions of engines it causes no issues whatsoever
    if you can make that higher than the engine then it works even better
     
  3. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    I think perhaps Boatwiser could find the information he wants better by browsing Google images of boat exhaust systems for a suitable solution to what he wants that would suit his boat.Opinions deliberately misinterpreted just to try and put down differing ideas does not help any one.
    I have spent many thousand of hours operating multi million dollars of equipment that use
    the same principles as in boat exhaust systems and being able to actually see through transparent areas to see what is happening to water and air flows hot and cold.
    I have spent a lot of time using the same principles to see how boat induction and exhaust systems behave in my own boat so I think I have valid but perhaps different opinions.
     
  4. IMP-ish
    Joined: Jan 2011
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    IMP-ish powerboater

    Mercruiser wet exhausts don't cause engines to die on 99% of sterndrive boats. Since yours had problems I'd get to the bottom of what happened as much as you can and see what can be changed. Is there room to add a riser spacer which is fairly cheap. Could even modify hatch if you have to. Had the flaps in the y pipe failed or does it have thru hull exhaust? If thru hull, what kind of external flaps - change them to a different brand. They're cheap. Could even move up exhaust tips if there's room for higher risers if they're getting slammed and you think that's how it failed.
     
  5. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    My ideal for cooling a boat motor is to use a fresh water closed system with anti freeze and anti corrosive additives coupled with internal or external keel coolers or heat exchangers.
    For the exhaust an all metal raw water cooled exhaust manifold, water jacketed exhaust pipes and mufflers with the cooling water exiting at the tail pipe to quieten sound.
    Include emission control system in that plus exhaust oil and soot scrubbers.
    And why not dry insulate the exhaust system so if water cooling fails you could still get home.
    If you own a boat you are going to have a clean system some time soon and be chased up by regulatory bodies.
     

  6. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

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