1923 German engine for motorized bikes

Discussion in 'Board Trackers and Vintage Motorized Bicycles' started by diegom, Mar 6, 2010.

  1. diegom

    diegom New Member

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    hi guys,

    just for fun (and a bit of history) since it's made out of pure un-obtanium, but here's some pics of a true gem: a 1923 four stroke clip-on engine made by Columbus-Horex Gnom, somewhere in Germany...

    I find it impossibly cool

    ciao!
     

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  2. diegom

    diegom New Member

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    More pics... note the magneto ignition!

    how cool would a boardtracker be with one of those??

    ciao
     

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  3. Nougat

    Nougat New Member

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    Is that one of those crazy rare diesel engines?
     
  4. 2door

    2door Moderator
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    #4 2door, Mar 6, 2010
    Last edited: Mar 6, 2010
  5. diegom

    diegom New Member

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    well, it's got a normal sparkplug (in front of the valves) and a magneto, so it's a normal gas engine...
     
  6. diegom

    diegom New Member

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    thanks tom!!

    so it's a 62.5cc :))

    ciao
     
  7. diceman2004

    diceman2004 New Member

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    thats awsome , to see those open valves moving would indeed be cool .
     
  8. Crazy Horse

    Crazy Horse Dealer

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    Now this is a real vintage motorbike!

    Verstehen Sie? Das gefällt mir.

    Bis später. Crazy Horse.
     

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  9. diegom

    diegom New Member

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    That's awesome, Crazy Horse!!!

    where the **** did you find those pics??
     
  10. diegom

    diegom New Member

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    having exposed rockers arms and valves was a lot more common that you might think...

    even the Ducati Cucciolo had them until about 1955 when they finally put a cover on them (but still no forced lubrication!!)
     

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  11. K.i.p

    K.i.p New Member

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    Neat-o smash-o, these pics and the motors are fantastic!
     
  12. mabman

    mabman New Member

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    Thanks for sharing this part of MAB heritage to all that have contributed so far. The best thing about the internet is how easily this type of info is disseminated.

    This type of engine obviously had favor back in the day. It makes alot of sense in that the weight is about as low in the chassis as possible but inline to the dropouts which would arguably provide the best possible handling of any motor assist bicycle. It is important to be able to pedal efficiently and the narrow aspect of this type of motor allows for that. The biggest drawback that I can see is the amount of exposure it has to the elements that will be coming off the front wheel but that could be addressed as necessary.

    Oh, and I have seen a modern version of this under development btw. It is being held in a pretty tight wrapper but just lets say it works, and wellxct2

    Here it the Bugatti version.

    bugattit722.jpg
     
  13. diegom

    diegom New Member

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    I sure hope you'll post the info as soon as the cat is out! :)

    oh yes!! it's even more amazing...

    a 15,000 rpm, twin-cam, Roots SUPERCHARGED 10.6cc single built by Bugatti in 1947

    some more info on that:

    Bugatti
    the Bugatti revue, 12-1, Bugatti T72 fact sheet and photos
    Ettore Bugatti's cyclemotor

    the piston diam is only 22mm, less than 1" !!!! :)

    it must have been a damn screamer at full song

    ciao & thanks!

    diego
     
  14. diegom

    diegom New Member

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