Ruddertwin Connecting Rods

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  • April 28, 2018 at 3:52 pm #9767
    chris-p
    Participant

      I was asked today what the difference was in the connecting rods used on a Rudertwin, as the Port and Starboard Rods have different Part Numbers. I am not sure without opening one up to have a look. Anyone know off the top of their head?

      April 28, 2018 at 5:18 pm #74946
      PM T2
      Participant

        Canada Member

        Model year would help.

        Checking my early parts (pre-1923) I can’t find any difference between port and starboard side rods. No part numbers on the beam.

        PM T2

        He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...

        April 28, 2018 at 9:05 pm #74962
        garry-in-michigan
        Participant

          Lifetime Member

          My thought is the later rods had a longer wrist pin bearing and it was offset. The difference between right and left depended on which side of the rod they drilled the oil holes. The holes are always on the "up" side. . . 🙂

          April 29, 2018 at 1:59 am #74988
          chris-p
          Participant

            That is exactly what I thought as well Garry. He told me he had oil holes on both sides though, so I think someone in the past use two ports or two starboards and drilled new oil holes. Not sure.

            April 29, 2018 at 12:19 pm #75002
            PM T2
            Participant

              Canada Member

              The set of rods I have out are from a Model F, they are both drilled on both sides for oiling, so I believe this makes them interchangeable. Measuring features on them indicates no difference between the two. I would have to think later Light Twins adhered to this as well. Just my thoughts.

              Best,
              PM T2

              He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...

              April 29, 2018 at 2:00 pm #75009
              chris-p
              Participant

                Thank you Chris. Perhaps I should check for myself, but I was told that they have different PN#s, yet looked identical?

                April 29, 2018 at 4:17 pm #75020
                wbeaton
                Participant

                  I know who you were talking with. I mentioned this to him last year. The 1924-25 Model C/D manual clearly states a right and left connecting rod with different numbers. I don’t know what the difference is. In 1926 the manual states the same part number implying that the rods are interchangeable. I believe the later rods have a different part number than the earlier ones, but I’m going from memory which is often unreliable.

                  Wayne
                  Upper Canada Chapter

                  uccaomci.com

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