From:
http://www.contactmagazine.com/Issue54/ ... asics.html
I could be wrong about my point of view...but I'm not.Confusion and a lot of questions exist as to detonation and pre-ignition. Sometimes you hear mistaken terms like "pre-detonation". Detonation is one phenomenon that is abnormal combustion. Pre-ignition is another phenomenon that is abnormal combustion. The two, as we will talk about, are somewhat related but are two distinctly different phenomenon and can induce distinctly different failure modes.
See how this works? Bet'cha wish I'd stayed in my hole, 'eh?
**edit**
A btw, by the way:
'Incidentally, the knocking or pinging sound is not the result of "two flame fronts meeting" as is often stated.'
I've heard this a thousand times if I've heard it a hundred. OK..so I've heard it a couple dozen times. The old 'flame fronts colliding' is bogus. It was bogus last time you heard it. It will be bogus the NEXT time you hear it.
Cheers!
**edit agin**
That link is great! More/better information explained more clearly than I've seen. READ IT!!