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Old 11-04-2009, 07:11 PM   #11 (permalink)
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Hmm,

Where is the Valve Overlap ? Did see any. Is this one of those Octane testing engines ?

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Old 11-07-2009, 04:25 PM   #12 (permalink)
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overlap

Quote:
Originally Posted by donee View Post
Hmm,

Where is the Valve Overlap ? Did see any. Is this one of those Octane testing engines ?
I understand that for economy-minded applications,zero overlap would be preferred,so this test engine might have been configured,cam-wise, for that outcome.
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Old 11-07-2009, 04:35 PM   #13 (permalink)
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It looks like to me that the film is stop way before the exhaust valve is closed, so it looks like there isn't any valve overlap.
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Old 11-07-2009, 04:53 PM   #14 (permalink)
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Yes, the cycles are stopped before the exhaust valve is closed. If someone wanted to extrapolate, you could determine from the valve speed if there was any overlap based on the CA designation at the bottom left corner of the video.

That designation explains what angle the crank is at relative to center line during each event in a rolling time table.
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Old 11-07-2009, 10:35 PM   #15 (permalink)
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Really interesting video - I've never seen a video like this. Thank you.

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