[Superman]

My engine runs very much better at the advanced ignition timing. So I don't want to retard the timing if I don't have to. It's abotu seven degrees more advanced than factory spec.

One of the reasons I think this is not simple pinging due to advanced ignition timing is because it generally does not happen. Not repeatable.

Another reason is the smoke. I don't recall smoke in the cars I've seen that ping.

And also, the power loss. Again, this generally does not happen or is not pronounced where the problem is simple pinging.

I have not conducted exhaustive experiments, but it seems to me that once it has happened, it doesn't happen again for quite a while.

Oh, and Chris, it doesn't seem to happen at 6000 rpm. It seems to happen at five.