Originally Posted by flypaper 2
Might pull the head and see if it blew a head gasket if it has one, or popped a hole in the piston.
Gord, Bet that you broke the con rod. Since you noted something while flying, I'm thinking this is the problem. I had the same problem w/ my JBA. This usually is attributed to insufficient lubrication. However, I had it happen twice and when looking at the rod, the first time it look like a casting defect.