Pre/post ignition

[Bruce Plecan]

As I recall from a Texaco Research Film (?) from the early 70's,
in a series of variable compression engines they were able to
generate a pre-ignition event at 5-7d pre ignition.  
  If someone has something more current/up to date, I'd like to
hear it, cause the neural net involved with this is an old set.....
  Just to stir things up,  wouldn't the most viotile stuff react first,
leaving little or nothing combustable, for a post event?.  
  Cheers
Bruce