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920cc Featherbed

Discussion in 'Other Norton Motorcycles' started by jseng1, Apr 22, 2019.

  1. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    Here's a short vid of a customer with a 920 featherbed. Seem to be very free revving for a 920

     
  2. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    Can't get the video to run.
     
  3. ashman

    ashman

    Joined:
    Jul 11, 2010
    It comes up that the video has been removed by the user, would have been interesting to see.

    Ashley
     
  4. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Hello.

    This is new link:
     
  5. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Hey everybody.

    The power measurement is now done, taking a little fine tuning to find out the final result.
    Big thanks to Jim & Steve for the good parts and special thanks to Jim for advice.
     
  6. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Sorry but I can't attach a photo from a mobile phone, but could anyone give advice?
     
  7. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    Here's Wade's Monster 920cc feather bed and 90 HP dyno chart.


    [​IMG]

    [​IMG]
     
    xbacksideslider and Fast Eddie like this.
  8. xbacksideslider

    xbacksideslider VIP MEMBER

    Joined:
    Aug 19, 2010
    Congratulations, not only beautiful but seriously powerful and in a great handling chassis. Edit - Love that torque curve.

    Can you feel my envy?
     
  9. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    +1 !!
     
  10. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Than you guys.
     
  11. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Yeah, the combination of flat torque and linear power curves should make that an easy bike to ride fast for sure!

    Interesting how the power flattens off at 6,000rpm, my 850 did the same.

    What are the internal specs?

    You got any build pics to share??
     
  12. Wadefin

    Wadefin

    Joined:
    May 3, 2019
  13. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Brilliant!

    Thanks for sharing.

    Really nice work.
     
  14. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Thanks.
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Sorry matey but I gotta ask more !

    What cam are you using?

    Did you measure the compression ratio, if so what is it?

    How difficult is it to kick over?

    Is that a stage 2, or stage 3 Maney head?

    What are the carbs? And what size.

    What ignition are you running?

    That’s all for now !
     
    texasSlick likes this.
  16. t ingermanson

    t ingermanson VIP MEMBER

    Joined:
    Oct 17, 2018
    Looks sweet!

    What forks/yokes are you using? Do you know the offset to the yokes?

    My Triton has a similar set up (lower offset yokes, 18" wheels, longer swingarm) and I'm quite fond of the handling, but wondering if you've ridden yours around much yet and what you think.

    That motor would get me into trouble! Lovely.
     
  17. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    Eddie.

    I don't know what the camshaft is, but it has a lot of overlap in small degrees.
    The compression ratio is 10.63
    It starts well, but a bit of heat is a bit difficult.
    The cylinder head is stage3, but there is a slight change.
    Carburetors are the Mikuni accelerator pump 38mm carburettors.
    The ignition is HPI.
    All parts of the cover and others are lightened.


    Inger Manson.

    Yokes has been made by a friend.
    Offset is 37mm
    I've been satisfied ... The steering is accurate and fast. I like it.
     
  18. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Sounds brilliant. Bet it’s an absolute blast to ride !
     
  19. Wadefin

    Wadefin

    Joined:
    May 3, 2019
    And of course Jims long rods and coated pistons.
     
  20. mdt-son

    mdt-son

    Joined:
    Jan 19, 2012
    A torque of 110 Nm (81 ft-lb) at the crankshaft is quite an achievement. You almost got rid of the pronounced dip at 3500 rpm seen with the regular 850 as well.
    However, the engine is in a high state of tuning. How long will it hold up in a street bike? I would be particularly worried about the crankshaft and if you are using a bolt-up crank,
    I suggest you order a billet crankshaft the sooner the better.

    -Knut
     

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