Originally Posted by PhilM

Stu, looks to me like you want this to continue, so, heres a question.

I believe, though dnt know (am kind of asking ), that when we map ignition, we map it to the point of detonation (heard through the above detcans) - and then back off a little.

What exactly is happening during this ignition advance provoked det? Is it an unstable burn?? or, is it that the burn is fine, and peak cylidner pressures are reached too early (before TDC maybe?)

Thanks, hope this question will heplp others understand a little more about it too