Postrip
Pinnacle OPE Member
I have no idea 2 be honest!What happened?
There is no damage to valves or head, that's the only damage to the piston.
I thought the top ring may be extremely worn, and may have come out of the groove, but there is no gouging of the cylinder wall either.The engine has been quite hot,as the oil in sump smells burnt.
I'll inspect further tomorrow if I get a chance, maybe some little sign of what went wrong....to be continued