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Water pump dimensions

Home › Forums › General Questions › Water pump dimensions

Viewing 11 posts - 1 through 11 (of 11 total)
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  • 20 August 2019 at 17:44 #425219
    Garry Coles
    Participant
      @garrycoles69390

      Hi, On my 2 in D & NY Traction Engine that i'm building I seem to have a problem with the water pump dimensions. That or I missing something. The water pump plunger is described as 3/8" bore with a stroke of 1/2" . When I look at the eccentric drawing, the offset from the centre of the drive shaft to the centre of the eccentric is shown as 1/2" To me that gives a stroke of 1". If that is right, then the plunger dimensions are wrong because at a 1" stroke the graphite packing on the plunger will come out of the bore. Of course, I could be completely wrong. So can any one help me please.

      Cheers Garry

      20 August 2019 at 17:44 #26788
      Garry Coles
      Participant
        @garrycoles69390
        20 August 2019 at 20:09 #425241
        MichaelR
        Participant
          @michaelr

          I think this drawing is the D&NY water pump, there seems to be a difference in the pump ram and pump bore dimensions, looks like the pump bore is the wrong size

          img_0001.jpg

          20 August 2019 at 20:26 #425243
          JasonB
          Moderator
            @jasonb

            Drawing says ream 3/8" and shows ram as 3/8".

            1" stroke does sound too much for that engine, he did use 1" stroke for the larger horizontal pump but 1/2" stroke eg 1/4" offset is more likely. By comparrison my 2" Fowler is 3/8" bore x 3/8" stroke.

            Edited By JasonB on 20/08/2019 20:41:07

            20 August 2019 at 20:39 #425244
            Jeff Dayman
            Participant
              @jeffdayman43397

              Jason did you mean 1/2" stroke from a 1/4" offset eccentric? I think 1/2" stroke would work for the shown pump body, but not 1" stroke.

              20 August 2019 at 20:40 #425245
              JasonB
              Moderator
                @jasonb

                Yes Jeff, altered it now

                20 August 2019 at 20:46 #425249
                Jeff Dayman
                Participant
                  @jeffdayman43397

                  yes

                  20 August 2019 at 20:50 #425250
                  JasonB
                  Moderator
                    @jasonb

                    You only need to look at photos of other engines to see what the offset is, look at teh gear behind the eccentric, no way is it offset by 1/2"

                    20 August 2019 at 22:26 #425265
                    Garry Coles
                    Participant
                      @garrycoles69390

                      Thanks for the replies.yes I will now go ahead with 1/4" offset on the eccentric. The eccentric dimensions on the drawing are wrong then. Thank god for that. I've fabricated the body, but did not start on the eccentric yet. smiley

                      21 August 2019 at 08:55 #425288
                      JasonB
                      Moderator
                        @jasonb

                        This video shows the pump quite well, about half way through you can see that the ram lifts a little more than it's diameter so 1/2" stroke.

                        21 August 2019 at 09:12 #425290
                        Garry Coles
                        Participant
                          @garrycoles69390

                          Thanks for the help Jason. yes

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