You know, I've given that some thought off and on over the years, and I can't help but wonder if some folks aren't comparing apples to oranges there... As in maybe some tests were done with air present (nitrogen=explode) and others were done with straight HHO (explode & immediate implode). It seems like it would be a great test to try with a sturdy steel detonation chamber, a high point recording pressure gauge and vacuum gauge on a one way valve (a sturdy one )