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Old 07-03-2009, 06:34 AM   #721
100mpg
This sentance intent
 
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Quote:
Originally Posted by Wheedle
WTF IZZAT!!!!


edit
holy crap, is that a 4 cyl 2 stroke? from what planet?
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Old 07-03-2009, 08:23 AM   #722
Gimpinator
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Quote:
Originally Posted by Wheedle
WTF IZZAT!!!!
It looks like a large outboard motor powerhead (v-4) mounted into a motorcycle frame. Pretty cool!
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Old 07-03-2009, 09:17 AM   #723
vtwin
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Not as exotic, but still pleasing to the eye.

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Old 07-03-2009, 09:25 AM   #724
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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
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Old 07-03-2009, 10:45 AM   #725
mud
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Quote:
Originally Posted by FloridaSteve
2 stroke porn..

Is that a six cylinder?????? There is a funny carb hiding in the frame member......
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Old 07-04-2009, 08:28 AM   #726
vtwin
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Quote:
Originally Posted by FloridaSteve
2 stroke porn..

What's with that little belt hanging off the side?
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Old 07-04-2009, 08:42 AM   #727
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Quote:
Originally Posted by vtwin
What's with that little belt hanging off the side?
Water pump drive. Appears to be driven off the alternator rotor.
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Old 07-04-2009, 08:48 AM   #728
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Quote:
Originally Posted by Gimpinator
It looks like a large outboard motor powerhead (v-4) mounted into a motorcycle frame. Pretty cool!
Looks like 3 disc-valve singles sandwiched between two alloy plates and all driving an intermediate shaft.
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Old 07-04-2009, 08:57 AM   #729
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Quote:
Originally Posted by Gimpinator
I'm learning how to make a 427 SOHC live at insane rpm.

Here's what 9,000 rpm sounds like. Sweet! I could listen to that all day. 10,000 rpm still, um, needs a bit of work!

The spring gets super hot at that rev level. When the bolt pulled out oil started gushing onto the hot spring. When I saw the smoke I shut her down immediately... No damage except for a few stripped threads. We will fight another day.
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.
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Old 07-04-2009, 09:43 AM   #730
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Quote:
Originally Posted by Gimpinator
I'm learning how to make a 427 SOHC live at insane rpm.

10,000 rpm still, um, needs a bit of work!




The spring gets super hot at that rev level. When the bolt pulled out oil started gushing onto the hot spring. When I saw the smoke I shut her down immediately... No damage except for a few stripped threads. We will fight another day.
Tell us about your image capture setup.
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Old 07-04-2009, 09:51 AM   #731
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Quote:
Originally Posted by vtwin
[IMG]http://i103.photobucket.com/albums/m135/rdkingryder/036-2.jpg[IMG]
I met Jay up at Alices five or six years ago. He was on his Sportster engined cafe racer. He told me about his Jag engined Corvair and the 2/3 scale Ford he was building. I saw it up there a few years later. He also has a V-16 Marmon.
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Old 07-04-2009, 11:16 AM   #732
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Quote:
Originally Posted by Andrew
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.
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Old 07-04-2009, 11:22 AM   #733
DELTATANGO
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That is really interesting. Look at how the valve bounces.
Is it bouncing/floating enough to open it?
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Old 07-04-2009, 12:33 PM   #734
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Quote:
Originally Posted by DeputyTom
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!
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Old 07-04-2009, 12:52 PM   #735
DELTATANGO
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Quote:
Originally Posted by Gimpinator
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.

Neat. Thanks.
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