Tinkering with the exhaust system

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  • ndutton
    Afourian MVP
    • May 2009
    • 9777

    Tinkering with the exhaust system

    Last year I installed an automatic waterlift drain. With the marginal hot section rise on a Catalina 30 it's one more level of protection against water incursion through the exhaust. Every time the engine is turned off the residual water in the waterlift drains into the bilge. After the drain period expires the drain valve closes.

    The drain valve is closed when the ignition circuit is on, open for five minutes after the ignition is switched off, closed following that period and as a fail-safe, closed when power is removed.
    Attached Files
    Neil
    1977 Catalina 30
    San Pedro, California
    prior boats 1987 Westsail 32, 1970 Catalina 22
    Had my hands in a few others
  • GregH
    Afourian MVP
    • Jun 2015
    • 598

    #2
    Very interesting!

    Is that a kit or a la carte items you put together?
    Greg
    1975 Alberg 30
    sigpic

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    • ndutton
      Afourian MVP
      • May 2009
      • 9777

      #3
      a la carte

      The attached drawing includes component info.
      Edit: the wire colors on the drawing correspond to the wire colors on the components.
      Attached Files
      Last edited by ndutton; 02-02-2022, 07:35 PM.
      Neil
      1977 Catalina 30
      San Pedro, California
      prior boats 1987 Westsail 32, 1970 Catalina 22
      Had my hands in a few others

      Comment

      • ndutton
        Afourian MVP
        • May 2009
        • 9777

        #4
        Without prior experience, programming the delay timer will be a challenge. There are over 33 timing sequences to choose from and a seemingly infinite range of delays, all selected by shorting the programming leads in a sequence or pushing either or both buttons on a programming circuit board which is not included in the purchase. After the considerable learning curve it's not that big of a deal but it's a steep curve getting there.

        This may be a choose your battles moment. I can help because I've been through it. An option is to send me your timer (fits in an envelope) and I'll program it. Takes me maybe 10 minutes. I'll confess the first time took over an hour.
        Neil
        1977 Catalina 30
        San Pedro, California
        prior boats 1987 Westsail 32, 1970 Catalina 22
        Had my hands in a few others

        Comment

        • sastanley
          Afourian MVP
          • Sep 2008
          • 7034

          #5
          Neil, if you had one of those crappy Vetus waterlifts like I do, the plastic drain cap in the bottom of the muffler leaks all by itself, right into the bilge.
          -Shawn
          "Holiday" - '89 Alura 35 #109
          "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
          sigpic

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          • ndutton
            Afourian MVP
            • May 2009
            • 9777

            #6
            Originally posted by sastanley View Post
            Neil, if you had one of those crappy Vetus waterlifts like I do, the plastic drain cap in the bottom of the muffler leaks all by itself, right into the bilge.
            Yeah Shawn, can't help you with that.
            Neil
            1977 Catalina 30
            San Pedro, California
            prior boats 1987 Westsail 32, 1970 Catalina 22
            Had my hands in a few others

            Comment

            • ejay
              Senior Member
              • Jul 2022
              • 68

              #7
              Neil, my C30 had a system of drainage just like yours, but I found that dumping water mixed with exhaust gases into the bilge, where it would sit for lengthy periods of time was not optimal. A previous owner installed the system so I don't know how many years it has been in place, but I wonder if the constant salt water bathing the keel bolts has contributed to some of the surface rust there. Also, the smell from the exhaust fouled water just underneath the salon is bothersome to my wife, which negatively impacts our weekend getaways on the boat.

              Would it be possible to install a small water pump to move the exhaust water from the muffler to a drain somewhere when shutting off the engine? Is the temperature of the water from the muffler suitable for normal drain tubing?
              EJ
              78 Catalina 30

              Comment

              • ndutton
                Afourian MVP
                • May 2009
                • 9777

                #8
                I have not noticed an exhaust-y odor in the boat since the installation of the drain system. However, I'd be interested in the details of yours to see if there's a difference from mine. But remember, I'm not convinced such a drain is necessary. There's only a quart of residual water in the muffler after shutdown. It's just not significant.

                Here's a picture of my vent hose where it attaches to the galley sink drain plumbing:
                Attached Files
                Neil
                1977 Catalina 30
                San Pedro, California
                prior boats 1987 Westsail 32, 1970 Catalina 22
                Had my hands in a few others

                Comment

                • ejay
                  Senior Member
                  • Jul 2022
                  • 68

                  #9
                  I agree that the small amount of water in the muffler is probably not the source of my engine issues.

                  We do have an petroleum like odor problem in the boat, which I have blamed on the exhaust water, but I am not sure now.
                  EJ
                  78 Catalina 30

                  Comment

                  • ndutton
                    Afourian MVP
                    • May 2009
                    • 9777

                    #10
                    Originally posted by ejay View Post
                    We do have an petroleum like odor problem in the boat, which I have blamed on the exhaust water, but I am not sure now.
                    More likely it's from crankcase blowby. In the course of sorting out your engine issues we will certainly recommend a precise timing exercise which has a significant effect on blowby. If odor continues to be a nuisance you may be a candidate for the Indigo Electronics PCV system. On my boat it would be a last resort to stave off rebuilding.
                    Neil
                    1977 Catalina 30
                    San Pedro, California
                    prior boats 1987 Westsail 32, 1970 Catalina 22
                    Had my hands in a few others

                    Comment

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