7 equi-spaced holes on a pcd – why?

Advert

7 equi-spaced holes on a pcd – why?

Home Forums General Questions 7 equi-spaced holes on a pcd – why?

Viewing 5 posts - 26 through 30 (of 30 total)
  • Author
    Posts
  • #339891
    Ian Hewson
    Participant
      @ianhewson99641

      Just don”t forget what I mentioned about getting to the standard to fit the cylinders with extra studs.

      Advert
      #339892
      JasonB
      Moderator
        @jasonb

        When John Bertinat did his compound version using many of the same castings he managed to use 8 fixings. To do so the minimum of metal was taken off the cylinder mounting flanges thereby increasing it's diameter, fixing size reduced from 6BA down to 7BA whichcombined allowed the PCD to be increased by 1/8" so the fixings had more clearance to the trunk guide.

        tangye2.jpg

        #339916
        ChrisH
        Participant
          @chrish

          Going back to Ian Hewson's two photos posted 03/02/18, what a lovely looking engine, beautifully finished, a credit to you Ian.

          Chris

          #339966
          Ian Hewson
          Participant
            @ianhewson99641

            Thanks for the praise, Emgee and Chris, much appreciated although that was not what I posted for. Engine was 95% complete when pics were taken, see through oilers and drain cocks fitted since.

            Just wanted to say that the clearance is limited between the cylinders and standards, was a pain to fit the nuts to the studs with the room available, took a lot of work to provide clearance with the Dremmel.

            #340000
            Howard Lewis
            Participant
              @howardlewis46836

              The Black Country Living Museum are very strict about the territory. The Perkins Heritage Group have a 1923 Autocrat car, (one of only two left). We offered it to BCM. It was declined since it was manufactured in Balsall Heath which isn't in the Black Country!

              It was terrible to see machine tools left in a field, already rusty, from being without any protection, not even a sheet or tarpaulin.

              Probably, the last of the Tangye ("We launched the Great Eastern. The Great Eastern launched us" family was the late Derek Tangye, a charming man, who moved, with his wife, to a remote part of Cornwall to write books, grow tomatoes and daffodils. The books were the more lucrative crop!.  Tangyes went on to manufacture large compression ignition engines (There is one at The WaterWorks Museum in Hereford, which until relatively recently ran under its own power.  Since a crack was found in a crank web, it has been rotated by an electric motor)

              Howard

              Edited By Howard Lewis on 06/02/2018 11:00:42

            Viewing 5 posts - 26 through 30 (of 30 total)
            • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

            Advert

            Latest Replies

            Home Forums General Questions Topics

            Viewing 25 topics - 1 through 25 (of 25 total)
            Viewing 25 topics - 1 through 25 (of 25 total)

            View full reply list.

            Advert

            Newsletter Sign-up