So Frank is saying that the ring pin beat a hole upward into the piston dome, then found its way back down that hole beating another hole down inside the piston to the second ring? Wonder if the pin is still in there somewhere?..
Would love to see a picture of this piston after the rings are removed, perhaps media blasted so the path of the pin can be seen….Pretty respectful of that pin not to chew up the cylinder wall…
What I’m saying is that at 5000 RPM, the piston is making 10,000 strokes a minute, 5000 up and 5000 down, or 167 strokes a second. That loose pin was like an ice cube in a cocktail shaker, beating back and forth at an incredible rate. I wonder how many G’s that is? Till it finally broke out the top and out the exhaust ports. On the encouraging side, there are an awful lot of motors out there that haven’t failed.