Combustion Dynamics on video

[donee]

Hmm,

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

[aerohead]

Originally Posted by donee

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.

[pgfpro]

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.

[Christ]

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.

[Wonderboy]

Really interesting video - I've never seen a video like this. Thank you.