It looks to be a fairly "open" cylinder, with not a lot of quench space, but apparently, someone put a HSC in a cylinder and ran the engine.
From what I've been told, the time that you can see the flames are where they are not properly stratified, and thus, aren't optimal AFR for the given area.
This kind of might give some of us an idea of how things are really taking place in there, for those who can't visualize it.
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