Pinging?

[Pterodactyl_imp]

That's interesting Flynrider, I wouldn't have thought that altitude change would trigger that. I guess I have been enlightened. As for pinging noises, my high frequency hearing is so shot I'm not in the race to hear pinging. I just try to avoid lugging the engine and hope it's not pinging. Detonation is another description more often used in aviation than auto I guess. When I was a lad pinking was the usual term, sometimes spark knock. As opposed to bearing knock of course.

Cheers