Home Forum Ask A Member Unburned Fuel collection

Viewing 10 posts - 11 through 20 (of 29 total)
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  • #63178
    chris-p
    Participant

      There are reed valves, which I removed for pictures sorry. They screw on the other side of those filters. Allow fuel/oil out, but nothing in.Not a dumb question at all!

      #63189
      jim-moffatt
      Participant

        US Member

        The tubes leading to the reeds are of a precise diameter to allow just so much to escape. Since they are the same diameter both crankcases leak equally.

        #63198
        bill-mcnamara
        Participant

          Canada Member

          Wayne,
          Yes, one motor can shut down and tilted up while underway with this set up.
          I just lucked out while looking through some of my sailboat gear and found this old bronze & stainless turnbuckle with rotating joints at each end rather than ridged eyes or forks.
          Very pleased about how that worked out.
          Pays to keep old junk around around sometimes huh?

          #63200
          bill-mcnamara
          Participant

            Canada Member

            amuller,
            Sorry no experience with the V-4’s…..yet.
            One 60 hp waiting in my barn for it’s wake-up call though!

            #63202
            bill-mcnamara
            Participant

              Canada Member

              Thanks to all for the interesting input and experiences,Bill.

              #63220
              frankr
              Participant

                US Member

                Actually, the pressure loss is very small, and happens whether the conversion is made or not. The only difference is where it goes

                #63229
                jeffersonsharp
                Participant

                  Boy, I like the idea of converting to fuel pump and using the pressure line as a fuel return line to the tank. This is testing my resolve to keep my engines as original as possible.

                  #63243
                  Anonymous

                    Frank, I was trying to figure who you were replying to about pressure drop.

                    Also, anyone heard of doing this conversion to a green tank Mercury?

                    Kirk

                    #63272
                    dockbuster1
                    Participant

                      Lifetime Member

                      IN 1967 the government did testing in FLA a 40 hp OMC was used it had 40 % plus unburned fuel loss overboard the US gvt passed a law as a result of the testing requiring the outboard mfg to recirculate unburned fuel no overboard dump by 1969 so anything prior dumps fuel that can be recovered I did a test on a 58 fat fifty I had heard that a 6 gal tank was gone in 20 mins at idle or WOT at 1500 by my calculations it was true I plugged off the overboard dump and ran the scavenge into a container I calculated a very rough 55% unburned fuel loss

                      #63281
                      amuller
                      Participant

                        There is loss from the crankcase drains, and there is loss from the cylinders themselves–mixture mixing with exhaust. Are we talking both here, or only the drains?

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