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Correct horn position

Discussion in 'Norton Commando Motorcycles (Classic)' started by olympus, Mar 7, 2018.

  1. olympus

    olympus

    Joined:
    Aug 5, 2017
    Hi all. on a 72 Mk1v what was the correct positioning of the horn please... mine in currently mounted on a bracket which looks genuine, this is bolted to the front of the battery carrier, directly in front of the battery

    Thanks
     
  2. Craig

    Craig VIP MEMBER

    Joined:
    Dec 20, 2005
    Not sure if that original position, but that where I put mine .... good spot , out of the way and you can hear it ....
    Craig
     
  3. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    The horn (and bracket) bolts to the underside of the battery tray.

    Factory manual, Section J, Fig.J7.
    [​IMG]
     
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    I believe the horn was the first component placed on the assembly line and the rest of the Bike was built around it...
     
    Tornado likes this.
  5. Craig

    Craig VIP MEMBER

    Joined:
    Dec 20, 2005
    When I built mine I started with battery tray first ... next several steps are blurred with time , but I do remember mounting that tray first
    Craig
     
  6. cliffa

    cliffa

    Joined:
    May 26, 2013
    Apparently in 1966 Dr. Stefan Bauer said to John Favill, Bob Trigg and Bernard Hooper "We need to make sure these horns continue to work reliably as Atlas buyers are complaining that vibrations are shaking their horns to pieces, and the warranty claims are killing us" , And "In all my years at Rolls Royce we have never had a horn fail". For them this was like a project from heaven, as until then they had been developing (amongst other things) a stepped piston two stroke and a twin rotor Wankel which had no horn problems at all. So they went to their drawing boards with vigor and came up with the idea of hiding the horn deep in the bike, facing it backwards to avoid road grime and also rubber mounting the engine to isolate it from vibration. It was in fact a very innovative setup (which later won many awards in the industry for horn mount design), and placed it at point "B" in this drawing below. As you can see the horn is mounted exactly on the axis of the the rocking motion between the rubber mounted engine and the rear wheel spindle, which by transmitting higher frequency vibrations out through the rear tyre was also part of the vibration reducing system. During prototype road tests by the likes of Frank Damp and his brave colleagues (see video of horn mount testing below (for secrecy disguised as frame testing)) a fortunate byproduct of this system was noticed. Incredibly you could still feel the handlebar grips after a 50 mile ride, and hence were able to test the horn whilst in motion! The NV board were delighted, and commisioned Wolff Olins to to use this as a marketing feature. They produced the famous Green Globe emblem which is in fact in the shape of a horn emitting sound waves and cleverly christened the system "Hornelastic". However, it seems that unfortunately something very similar to the "Hornelastic" name had already been used by a product advertised in magazines normally found in some newsagents, (but beyond the reach of children and wives). It was extremely fortunate that one of the chief executives on the NV board came across one these adverts and averted what would have been a very embarrassing episode in Norton's history. By way of a thank you the Norton board took his initials I.S.O. and the rest, well we all know....

    The Commando was born !! ;)


    Horn location..



    Horn testing..

     
    Last edited: Mar 7, 2018
  7. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    My '72 has it mounted behind the battery box.
     
  8. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    My '74 *50 has it nestled below and behind the swingarm pivot on a triangular plate hanging off bolts through battery box above....same bolts attaching to rear fender support bracket.
     
  9. Craig

    Craig VIP MEMBER

    Joined:
    Dec 20, 2005
    In fact mine is mounted on front of battery tray in the threaded bush for battery bracket strap maybe , used a rubber washer and turned it in , after market horn and it faces forward
    Craig
     
  10. Mr. Rick

    Mr. Rick VIP MEMBER

    Joined:
    Feb 6, 2009
    Helluva story, Cliff. Thanks for filling in the blanks of this obscure history. Belongs in the archives!;)
     
  11. DogT

    DogT VIP MEMBER

    Joined:
    Jan 20, 2009
    Cliff, that's the best story I've read since the pigs ate my big brother. Or is that et?
     
  12. cliffa

    cliffa

    Joined:
    May 26, 2013
    Thanks Mr. Rick & DogT. Actually there is more to the story, but I’ll save that for later.
     
  13. olympus

    olympus

    Joined:
    Aug 5, 2017

    Cliffa...Many thanks .. I'm lost for words
     
  14. arch

    arch VIP MEMBER

    Joined:
    Jul 22, 2004
    Mine was in the stock location until one of the spade connector failed. After spending half a day completely disassembling the bike I now have an attractive after market horn attached to one of the bolts on the coil bracket.
     
  15. XTINCT

    XTINCT VIP MEMBER

    Joined:
    Jan 10, 2012
    Cliffa, nice story, well told.
     
  16. Tornado

    Tornado VIP MEMBER

    Joined:
    Dec 5, 2017
    Ha, got my 45 yr old horn to make a honk....all it needed was a fully charged 12V battery... the note is OK but volume not nearly as loud as the Fiiam Freeway Blaster II I just fitted to the bike two days ago. I guess I'll see if the oem is of value to the market place...
     
  17. DogT

    DogT VIP MEMBER

    Joined:
    Jan 20, 2009
    I remember the last time I tried my OEM horn it was pretty pathetic. But then I was looking at a young bear going up a tree after I'd stopped anyhow. I was just trying to get it's attention.
     

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