Info proper impressive engineering

Discussion in 'Other 250's' started by jimv50, May 27, 2020.

  1. jimv50

    jimv50 Well-Known Member

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    ELDEE VELOCETTE Engine Cams are Driven by 9 timing gears, Single Cylinder DOHV 250cc Engine
    velocette 250.jpg
     
    jimv50, May 27, 2020
    #1
  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Yes it is, and all done without any computers.
     
    Murdo, May 27, 2020
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  3. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Wow, impressive, but wouldn't all of those gears be robbing the engine of power (I'm not an engineer)?
     
    Frankster, May 27, 2020
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  4. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Yes it would to some degree, but that would be off set somewhat by the valve timing being more accurate and delivering more power.
     
    Murdo, May 27, 2020
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  5. risky

    risky risky

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    a friend of mine in west wyalong is building one of these engines and doing the work himself at 82.
     
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    risky, May 27, 2020
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  6. jimv50

    jimv50 Well-Known Member

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    And on a slightly larger scale......
    deltic-gears-being-worked-on-photo-1.jpg
     
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    jimv50, May 27, 2020
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  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    That looks like the bottom half of an accessory gearbox from an aircraft.
     
    Murdo, May 28, 2020
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  8. Allan

    Allan Well-Known Member

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    I see that one uses the offset straightcut gears like those on my 1969 Honda CL175.
    According to the manual, that made them quieter and stronger than a single straightcut gear but with less friction than a helical gear.
    The ABT system on the Wilderness Railway in Tasmania uses the same idea. In that case, I believe it was the strength that was important.
     
    Allan, May 28, 2020
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  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 28, 2020
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  10. jmw76

    jmw76 Well-Known Member

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    Honey I shrunk the mechanic so he could fix my motorbike.:dance2::dance2::dance2:
     
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    jmw76, May 28, 2020
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  11. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Murdo, May 28, 2020
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