the art of engine

Discussion in 'Shiny Things' started by Loadedagain, May 21, 2005.

  1. 100mpg

    100mpg Self Imposed Exile

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    :lurk

    edit
    holy crap, is that a 4 cyl 2 stroke? from what planet?
  2. Gimpinator

    Gimpinator This is my Mom's cat

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    It looks like a large outboard motor powerhead (v-4) mounted into a motorcycle frame. Pretty cool!
  3. vtwin

    vtwin Air cooled runnin' mon

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    Not as exotic, but still pleasing to the eye.

    [​IMG]
  4. cagiva549

    cagiva549 whats a cagiva

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    Nice 409 , only took 49 pages for one to show up . the 348 truck engine was top shelf fifty years ago , SEYA
  5. mud

    mud I just wander.....

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    Is that a six cylinder?????? There is a funny carb hiding in the frame member......:eek1
  6. vtwin

    vtwin Air cooled runnin' mon

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    What's with that little belt hanging off the side?
  7. xlcr

    xlcr Stop being a dick, dick.

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    Water pump drive. Appears to be driven off the alternator rotor.
  8. xlcr

    xlcr Stop being a dick, dick.

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    Looks like 3 disc-valve singles sandwiched between two alloy plates and all driving an intermediate shaft.
  9. vtwin

    vtwin Air cooled runnin' mon

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    Was it a matter of the bolt not being torqued down? It seemed to unspin before it stripped the rest of the threads out. Nice videos.
  10. Andrew

    Andrew Optimus Primer Super Moderator

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    Tell us about your image capture setup.
  11. Anorak

    Anorak Woolf Barnato

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  12. Gimpinator

    Gimpinator This is my Mom's cat

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    I'm just using a digital stroboscope and a Canon Powershot at 30 frames/second. The stroboscope is the key. It can handle up to 10 kHz, which is 20,000 crank rpm. Interestingly, 30 frames/sec looks cleaner than 60 frames/sec. Must have something to do with the camera's native (optimal) setup.

    I typically process the raw video through a custom video editor that I hired a guy to write. If the program sees a completely black frame (from the strobe being off at that moment) it replaces the black with the average of the frame before and the frame after. At higher speeds it's rare to get a totally black frame though, since the strobe is pulsing so fast.

    Now for the bolt failure. The root cause is not enough thread engagement plus soft aluminum in the head casting. It did turn, but also stripped out a few threads. A Helicoil and longer bolts are the fix.
  13. DELTATANGO

    DELTATANGO Motorcyclist and Dog Walk

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    That is really interesting. Look at how the valve bounces.
    Is it bouncing/floating enough to open it?
  14. Gimpinator

    Gimpinator This is my Mom's cat

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    Yup! Here's a plot I made using a precision laser to measure the valve event at high speed

    [​IMG]

    The orange part of the curve at 7200 rpm shows the valve bouncing off the seat several times. This lets intake charge back out into the manifold during the compression stroke, killing power.

    I'll be buying one of these lasers as soon as I can rub a few more shekels together. It's expensive but the results are worth it!
  15. DELTATANGO

    DELTATANGO Motorcyclist and Dog Walk

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    Wow. So that is a perfect illustration of valve float.

    Neat. Thanks.
  16. pierce

    pierce Aven'Tourer

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    1934 BMW R7...

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
  17. FloridaSteve

    FloridaSteve Long timer

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    Sculptural bike but really there isn't much to actually see of the engine. It's mostly paneled off.
  18. pierce

    pierce Aven'Tourer

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    a bike is an engine with two wheels and a seat :deal
  19. JESSEJAMES

    JESSEJAMES vanilla gorilla

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  20. Andyinhilo

    Andyinhilo Long timer

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    Sorry if 205, but I just saw this.
    [​IMG]
    And it runs:
    [​IMG]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/0xe1LL1IC7Y&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/0xe1LL1IC7Y&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>