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Discussion in 'Shiny Things' started by Loadedagain, May 21, 2005.
holy crap, is that a 4 cyl 2 stroke? from what planet?
It looks like a large outboard motor powerhead (v-4) mounted into a motorcycle frame. Pretty cool!
Not as exotic, but still pleasing to the eye.
Nice 409 , only took 49 pages for one to show up . the 348 truck engine was top shelf fifty years ago , SEYA
Is that a six cylinder?????? There is a funny carb hiding in the frame member......:eek1
What's with that little belt hanging off the side?
Water pump drive. Appears to be driven off the alternator rotor.
Looks like 3 disc-valve singles sandwiched between two alloy plates and all driving an intermediate shaft.
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.
Tell us about your image capture setup.
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.
That is really interesting. Look at how the valve bounces.
Is it bouncing/floating enough to open it?
Yup! Here's a plot I made using a precision laser to measure the valve event at high speed
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!
Wow. So that is a perfect illustration of valve float.
1934 BMW R7...
Sculptural bike but really there isn't much to actually see of the engine. It's mostly paneled off.
a bike is an engine with two wheels and a seat
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Sorry if 205, but I just saw this.
And it runs:
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