One thing to keep in mind while looking at the videos is the speed at which this stuff actually happens. Some of the visual of the "burn" is likely to be an artifact of the filming process, similar to the images when looking at valve spring testing. Like watching the herky/jerky movement of an "old time movie" played on the wrong equipment....changes in motion or position that are too fast for the imaging equipment to smoothly capture.
While Endyne's degree of responsibility for NASCAR and Pro Stock ports in that timeframe seems like it will always be shrouded in mystery and controversy, it is undeniable that port development went from a fairly simple "make it bigger" mind set to a far more sophisticated flow management philosophy over a comparatively short timeframe. A valid comparison would be the abrupt move from flatheads to overhead valves, or carburetor to electronic fuel injection. Since then we have returned to a more typical evolutionary progression of port development, aided by computerization, the availability of low cost flow equipment, and OEM work.
Right. We are splitting hairs by trying to quantify something that happens in a fraction of a fraction of a second. It’s easy to get sucked up into semantics.
Ross and Randy are both saying the same thing, but Randy is looking at the big picture and Ross is zoomed in on a specific instant. It is certainly an explosion if we step back and look at the overall scenario but we can also zoom in and control that explosion. There is a flame travel and we can control where it goes and how quickly it goes there.
I believe that Randy and I agree on what happens in a chamber in general, and I also think we agree on what needs to happen and what can go wrong. However, I am not thinking about instant versus big picture. I am looking at it as something controllable, not violent and not unbounded. Fast, yes, but, controllable.
I spent 20 minutes verifying the behavior of explosion,detonation and deflagration, but decided not to be catty. In the end,
the terms overlap, but in the end remember, the space shuttle exploded, Pintos exploded, Chevy truck side impact...explosion. I am not so simple I cannot adjust thinking for a wider range of any definition, but I visualize the rapid burn in those pictures, not an explosion and CERTAINLY a controlled burn. If it wasn't controlled, the basic premise of chamber design and tuning would not exist.
If I build an engine for someone, I promise I am avoiding every sense of the term explosion, except maybe a rapid expansion of gas, but even then I am bending to be as much a gentleman as a knuckle-dragger like me can.
I have no desire to "win" but jumped in a few posts above because this was sort of a poke from a conversation I thought we had already ended by agreeing to not completely agree.