We had a see through engine w/strobe system at the uni I studied vehicle engineering at, it was really really educational to be able to adjust ignition timing a

We had a see through engine w/strobe system at the uni I studied vehicle engineering at, it was really really educational to be able to adjust ignition timing and fuel mixture and see how it would change the color & shape of the flame front. Probably a ton easier to simulate it these days but at the time it was absolute magic and really helped me understand how to ear-tune an engine to at least good enough to get on a dyno.