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Thread: Autopsy of De Dion Bouton engine that inspired the first Harley

  1. #1
    Join Date
    Nov 2002
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    France
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    89

    Default Autopsy of De Dion Bouton engine that inspired the first Harley

    Here the patient engine numbered 8985. Born around year 1900.


    Matching numbers on crankcase
    Last edited by Eric; 01-13-2010 at 09:50 AM.

  2. #2
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    France
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    Default Head removed

    On De Dion the head is separate from cylinder.





  3. #3
    Join Date
    Apr 2003
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    644

    Default

    What a beautiful survivor. I am confused by the intake/exhaust system. The carb is atached to the elbow at the intake tower? I don't understand the two nipples on the carb or the two for exhaust.
    Kyle Oanes AMCA # 3046

  4. #4
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    France
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    Default Intake Exhaust

    On exhaust side the upper if for sparkplug and under exhaust pipe.
    For carb upper is for connect to intake pipe and other is for take heat around cylinder with another pipe

  5. #5
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    France
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    Default Cylinder and piston


  6. #6
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    Sep 2005
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    Sarasota, Florida
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    3,462

    Default

    You can plainly see why H-D and many other fledgling companies copied the DeDion Bouton motor. Beautiful design.
    Eric Smith
    AMCA #886

  7. #7
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    Sep 2007
    Location
    Wis
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    Default

    Maybe that history of HD from the 1914 Atlanta Constitution newspaper article had some truth to it but it is so hard to tell with HD. Quote from the article; "There came to Milwaukee one day a Frenchman who was given employment in one of the departments then in charge of William Harley. During the noon rests this Frenchman told Mr. Harley of the wonderful gas engine being built by Count De Dion in whose employ the Frenchman had formerly been engaged."

    Kinda makes you wonder though.

    Dick

  8. #8
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    Nov 2002
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    France
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    89

    Default Crankcase and camshaft




  9. #9

    Default

    thanks for this ,it looks like a nice piece,really nice.aside from a curtiss the de dion is the one i want before i die.

  10. #10
    Join Date
    Feb 2003
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    High in the B.C. Rockies....
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    5,353

    Thumbs up

    Thank-you Eric for sharing such a great piece of history! The early inventors on this side of the pond must have been ecstatic when their powerplant was figured out for them! Awesome!!!
    Cory Othen
    Membership#10953

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