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Colour me impressed.

Discussion in 'Hangout Lounge' started by cds1984, Jan 24, 2026.

  1. cds1984

    cds1984 Well-Known Member

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    Yes YouTube!
    At first I was aghast, 'they cant do that!' and by the end I wanted a lathe.
     
    cds1984, Jan 24, 2026
    #1
    Dave in Ireland likes this.
  2. cds1984

    cds1984 Well-Known Member

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    I was researching cam journal boring, which this isn't obviously.
    I have 4 heads 31a some perfect with knackered cam caps from a fall or overtightening of the cover bolts and a bunch of cam caps I bought on eBay from Europe.
    All pretty much useless because of the uniqueness of the journal bore.... It seems. No amount of hopscotching those cam caps works out, I'll tell you that!
     
    cds1984, Jan 24, 2026
    #2
  3. Minimutly

    Minimutly Well-Known Member

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    If you have a sizeable lathe you could make a line boring setup, you would need to find a "tight" cap, maybe machine 5 thousandths or so off the mounting face. Then just mount your head between the centres, fit the cap and bore to size. Then finish up by lapping with an old unusable cam.
    I've also replaced caps with "best fit" ones, rubbed the face on carborundum and then scraped the bore to fit, this is the way bearings were sized years ago.
     
    Minimutly, Jan 24, 2026
    #3
    cds1984 likes this.
  4. cds1984

    cds1984 Well-Known Member

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    I wish I had a lathe. Or actually a workshop to fit a lathe. I know someone with a lathe but yeah... It's not the same.
     
    cds1984, Jan 24, 2026
    #4

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