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Check these videos.

You can see the swirl inside the flame propagation.

[youtube]https://www.youtube.com/watch?v=9V9u1KvyM5k[/youtube]
https://www.youtube.com/watch?v=9V9u1KvyM5k

[youtube]https://www.youtube.com/watch?v=TVTfNSTR39o[/youtube]
https://www.youtube.com/watch?v=TVTfNSTR39o

one with glass cylinder slow mo.

[youtube]https://www.youtube.com/watch?v=D1vJYdMddII[/youtube]
https://www.youtube.com/watch?v=D1vJYdMddII

Another one I found of a flat head , glass head I'm guessing.

in 1000fps.

[youtube]https://www.youtube.com/watch?v=sjAKdpltV4o[/youtube]

Nice, that flat head looks to be running a wasted spark setup and looks like it has a very good exhaust system.

From the guys comments in the video it's retarded timing so looking closely it's still burning on the exhaust stroke. It's a stationary engine so yeah magneto fires every crank rev.

I just find it interesting how it looks like the flames are been sucked out of the exhaust port.

yeah, exhaust scavenging affect, awesome vids vlad. thanks for sharing dude.

Yep, the 5th cycle in a 4 stroke engine

turbo spool flame

Neat, the last one would have some serious EGTs with the retarded timing!

Literally couldnt look away.. its like magic watching the flames being sucked away!