them there valves sure do open wide (says mr disbeliever)
Not wanting to be a spoilsport, but how come the camera appears to be shaking to much, so quickly (considering it's running at 1000fps)? Just looks odd, but might be a simple explanation.
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Is it a two stroke?
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Is it a two stroke?
No it has poppet valves, a 2 stroke would not.
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Not wanting to be a spoilsport but how come the camera appears to be shaking to much so quickly (considering it's running at 1000fps)? Just looks odd but might be a simple explanation.
Probably because it is vibrating at a higher frequency than 1000fps.
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Probably because it is vibrating at a higher frequency than 1000fps.
But in an engine wouldn't most of the vibrations be at engine frequency?
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Much of the exhaust stroke is missing from the film.
I still find it astonishing that at 7,000 RPM, this entire cycle happens nearly 60 times a second.
Edited by DP on 01/10/2009 at 15:41
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If film is genuine then max engine rpm is 600rpm based on;
cylinder goes up and down in approx 10s video time = 0.1s real time assuming video running a frame rate of (at least) 10 frames per second and frames taken by camera at 1000fps.
1 rev per 0.1s = 10 revs per s = 600rpm
Edited by Focus {P} on 01/10/2009 at 15:44
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Compression/firing stroke is shown, exhaust valve opens but piston not shown making exhaust stroke, inlet stroke then follows.
Engine appears to be detonating as flame doesn't start at the spark plug and starts before the spark. A bit peculiar.
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starts before the spark.
No it doesn't. I just looked again. Got that wrong. But you don't see the piston coming up on the exhaust stroke.
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Still don't understand why the camera should be shaking at such a relatively high frequency which is unrelated to engine frequency (rpm).
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>>Still don't understand why the camera should be shaking ...
Single cylinder research engine?
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>>Still don't understand why the camera should be shaking ... Single cylinder research engine?
So I would expect the shaking to be in time with the frequency of the engine ie. roughly follow the piston movement, to which the shake in the video seems completely unrelated.
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>>So I would expect the shaking to be in time with the frequency of the engine<<
I see what you mean Focus, amazing pics though - I wouldn't wanna be a fly on the wall :)
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Harmonic frequencies?
>>>>>>>>.excellant band they were
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Harmonic frequencies?
Sorry - only just spotted this post.
Don't know - do you think that's what it is, or just guessing? I would be interested to hear NC's thoughts on this clip.
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I see what you mean Focus amazing pics though
Yes - I just would like to be able to understand what I'm seeing. Video is also on youtube, but there's no additional information about its origin.
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tinyurl.com/ycuhafb
Popular mechanics, 1929. Viewed combustion via a quartz window.
More recent use of quartz windows: cylinder liner, pentroof and piston!
tinyurl.com/ybuzw4w
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The clip could have been slowed down some what. Still its very cleverly done and the fire ball over the pistons is exactly how I imagine it would look like. The clip also shows how lethal an engine could be.
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" The clip also shows how lethal an engine could be. "
Flies hanging around in the engine bay could meet a terrible end if someone had removed the air filter. Best not to think about the exploratory mouse.. might cause a misfire for a few seconds perhaps if its liver shorted the spark plug.
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The clip also shows how lethal an engine could be.
"Now in all the excitement Rattle, I kinda forgot whether this is a 2.8 litre straight six or a 3.5 litre V8. The thing is, do you feel lucky punk?"
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