Wet Exhaust Conversion

Discussion in 'Diesel Engines' started by Jim Thom, Mar 6, 2021.

  1. Jim Thom
    Joined: Mar 2021
    Posts: 1
    Likes: 0, Points: 1
    Location: davao

    Jim Thom New Member

    I have a keel cooler and a dry exhaust. I want to change over to a wet exhaust because of the noise. I've got everything sorted except suppling water to the lift muffler. Do you have any solutions? My boat is 11m monohull with an Isuzu 33HP diesel.
    Thank you, Jim
  2. bajansailor
    Joined: Oct 2007
    Posts: 3,650
    Likes: 1,594, Points: 113, Legacy Rep: 37
    Location: Barbados

    bajansailor Marine Surveyor

    Welcome to the Forum Jim.

    There are many advantages in having a keel cooler - I am wondering if it would be possible to put a noise reduction muffler on your dry exhaust?
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    A wet exhaust is not going to make it quieter unless there is a properly designed muffler added to it too. A well designed muffler will make it quiet if it stays a dry exhaust too. Mufflers should ideally be tuned to the engine and installation type.
    bajansailor likes this.

  4. kapnD
    Joined: Jan 2003
    Posts: 1,322
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    Location: hawaii, usa

    kapnD Senior Member

    You’ll need to add a raw water pump, either sourced from your engines manufacturer to bolt on, or a belt driven accessory pump.
    Hopefully there’s an existing raw water supply source that can be used, or you’ll need to fit a thru hull fitting with a seacock.
    The raw water cooled exhaust must be carefully designed, so as not to allow any water to backflow into the engine.
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