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Merlin DOHC Progress

Discussion in 'Norton Commando Motorcycles (Classic)' started by dobba99, Jul 24, 2018.

  1. dobba99

    dobba99

    Joined:
    Jan 25, 2014
    Just a couple of photos so far.



    Collected the three castings this morning (head and two cam boxes) and sat them on a set of the last Maney cases and barrels that Steve had left.
     
    Nater_Potater likes this.
  2. gtiller

    gtiller VIP MEMBER

    Joined:
    Nov 5, 2012
    Love this, can’t wait to see the story unfurl!
     
  3. Torontonian

    Torontonian

    Joined:
    Dec 28, 2009
    Wow. Very impressed.
     
  4. o0norton0o

    o0norton0o

    Joined:
    Apr 27, 2015
    I've done some work on a yamaha bike that was a parallel twin with a double overhead cam. It drove it's cams with a gear on the crankshaft centrally located between the cylinders with a chain that linked the cams above to the crank below. How do you plan on driving the overhead cams on the norton I wonder?? Bevel gear drive? chain drive ? something on the timing side off the crank gear? something else??
     
  5. acotrel

    acotrel

    Joined:
    Jun 30, 2012

    Like a G50 Matchless ? - might work. With the original 4 valve Ducati heads which were on Kevin McGee's bike in Australia, the belt drives used to give a lot of trouble.
     
  6. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    fiatfan likes this.
  7. o0norton0o

    o0norton0o

    Joined:
    Apr 27, 2015
    thanks Ken.
     
  8. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    This is wild, I like it!
     
  9. dobba99

    dobba99

    Joined:
    Jan 25, 2014
  10. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    Won't the height of the motor be a problem when you come to install it into a frame ?
     
  11. dobba99

    dobba99

    Joined:
    Jan 25, 2014
    Good question, measuring the height of a spare RH4 head and comparing it to the drawing the Merlin is quarter of an inch taller. I don't know what frame i will put it in, the originals were used in sidecarcross frames.
     
  12. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    1/4”... is that all? I expect much more than that to make space for the cams?
     
  13. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    There was mention in a MCW article in 1980 on the Merlin bout one being used in a stock frame, but no pictures were included. This is a snip from the article.

    Capture.JPG

    Ken