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  • Crank Pulley Hole Dimensions

    Anybody happen to have a print of the damper on a r series engine. I need to make a pulley, and I believe one hole is offset to insure orientation.

    Dan Giblin
    Cincinnati, OH
    Dan Giblin
    Cincinnati, OH

  • #2
    Why not buy another pulley?
    "All attempts to 'rise above the issue' are simply an excuse to avoid it profitably." --Dick Gregory

    Brad Johnson, SDC since 1975, ASC since 1990
    Pine Grove Mills, Pa.
    '33 Rockne 10,
    '51 Commander Starlight,
    '53 Commander Starlight "Désirée",
    '56 Sky Hawk

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    • #3
      I am mounting a Vortech supercharger and they don't make a pulley for a stude. I have a pulley that will work but I want to make sure I have the bolt pattern exact before I drill it.

      Dan Giblin
      Cincinnati, OH
      Dan Giblin
      Cincinnati, OH

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      • #4
        quote:Originally posted by gibbsr1

        I am mounting a Vortech supercharger and they don't make a pulley for a stude. I have a pulley that will work but I want to make sure I have the bolt pattern exact before I drill it.

        Dan Giblin
        Cincinnati, OH
        Why don't you just use an original reinforcement plate, or original crankshaft belt pulley as a template? Center it and bolt it to your "new" pulley, then drill the holes?


        Specializing in Studebaker Restoration
        Ray

        www.raylinrestoration.com
        Specializing in Studebaker Restoration

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        • #5
          I'd like to indicate it in on a mill so it will be exactly centered and run as true as possible and then drill the holes. I do have a plate like you said and I may end up doing it somewhat like that but I'd be willing to bet someone out there has the exact dimensions I'm looking for.

          Dan Giblin
          Cincinnati, OH
          Dan Giblin
          Cincinnati, OH

          Comment


          • #6
            I thought that it was posted here before, do a search for it...

            edit: found it, this is what I was thinking of

            http://forum.studebakerdriversclub.c...s=bolt,pattern

            so never mind, unless it is the same as the flywheel bolt pattern (anyone know? I doubt it, as the bolts themselves are smaller IIRC)

            nate

            --
            55 Commander Starlight
            http://members.cox.net/njnagel
            --
            55 Commander Starlight
            http://members.cox.net/njnagel

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            • #7
              What Ray said. You're making this much too difficult.

              Claude Chmielewski
              Studeski
              http://www.studeski.com
              Fillmore, Wisconsin
              47 M-16 Truck
              62 GT Hawk
              63 Lark
              64 Commander Wagonaire
              50 Champion Regal (parts car)
              [img=left]http://www.studeski.com/62hawk/62hawka/dakota01_250.jpg[/img=left]
              sigpic
              Claude Chmielewski
              Studeski
              http://www.studeski.com
              Fillmore, Wisconsin
              47 M-16 Truck
              53 Commander Regal HT
              53 2R5
              60 Lark VIII Convertible
              60 5E7 Champ pickup
              62 5E7 Champ no box
              62 GT Hawk 4 speed
              63 Lark VI parts car
              63 GT Hawk R2 4 speed
              64 Commander Wagonaire
              64 Daytona Convertible
              50 Champion Regal (parts car)
              36 Dictator
              36 Dictator in pieces

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              • #8
                I posted that other bolt pattern for the flywheel. The best way to make sure the pulley runs straight is to have a pilot on it that fits into the damper, then the holes can be oversize and have no impact on pulley runout. I will post the bolt pattern in a day or so.

                David L
                David L

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                • #9
                  David, I agree with the pilot but the pulley I have doesn't have an offset in it to allow a machined in pilot. That would be great if you could post a print. I developed a hole pattern on a bridgeport with a direct readout and a .316 drill blank. However, I'd like like to check it against your print just to be sure. Maybe I can ream 2 of the holes and use shoulder bolts to allign it.

                  Dan Giblin
                  Cincinnati, OH
                  Dan Giblin
                  Cincinnati, OH

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                  • #10
                    OK here is a sketch of the pulley bolt pattern from the pulley interface side NOT THE DAMPER pattern. The damper pattern is the same but with the 65 and 55 degree measurements reversed.


                    I can't get to my drawings of the pulley right now but I measured one of the R3 pulleys. This should be accurate. If you have X,Y corrdinates you can just use some Trig to see if your hole pattern matches. The only possible error would be the one offset hole could be off by 1 degree, but I don't think it is. With the clearance hole size it should be ok in any case. Since you have a pulley I would suggest that you make an adapter that pilots on the damper and the pulley. The below sketch shows the idea. I WOULD NOT attempt to use the bolt pattern to center to pulley to the damper.



                    Just machine a pilot hole on your pulley and then make the adapter to fit.


                    David L
                    David L

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                    • #11
                      Thanks for the help....I'll definately make the adapter pilot. This should be one neat little 259!!

                      Dan Giblin
                      Cincinnati, OH
                      Dan Giblin
                      Cincinnati, OH

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                      • #12
                        Which Vortech blower are you using?

                        David L
                        David L

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                        • #13
                          It's a V-1. I just got the pulley done last night. Now time to figure out how to mount everyting. Thanks for prints, witout those I bet i would have had the hole offset the correct angel, but the wrong way.

                          Dan Giblin
                          Cincinnati, OH
                          Dan Giblin
                          Cincinnati, OH

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                          • #14
                            Glad to help.

                            Post some pictures of what you are doing.

                            You can see some of my Bonneville race car over on the Studebaker racing forum.

                            http://racingstudebakers.com/stl-web...pic.php?t=1297

                            David L
                            David L

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                            • #15
                              Thanks for the sketches.

                              Just an idea...armed with that bolt pattern, an enterprising fellow could make the coupling hub for a front drive mandrel.

                              Eddie

                              "No matter where you are...there you are"
                              Dr. Buckaroo Bonzai

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