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Both Butting of the rings and or detonation can break the ring lands. With Detonation there is usually tell tale signs as in Specking of the pistons and quench pads. I cant tell from the pics if there is any specking because of all the scrappnel damage. But there could be. mike



Too tight of ring gap is a good point. The "good" pistons that are left in it (that didn't have any shrapnel hit them) don't show any signs of specks taken out of them. So the rings probably butted together, then?



if the bearings are hammered and fallout of the caps, it was detonating. it's very possible that detonation AND the rings butting together took place.



Maybe I exaggerated a little, Dan....the bearings don't actually fall right out of the caps (or the rod itself), and the wear surfaces actually appear to be really nice, but they seem to fit a little loose. For example when a rod bearing is seated in the cap, I can move it around with one finger.

I should probably practice with my el cheapo dial bore gauge and see if the rod big ends are still round, and at least try to inspect it properly....but I already have a new set of rods on the way, so I was going to just use them.

But in the interest of trying to learn something....if there is no "specking" on any of the pistons, is it fair to assume (for now) it did not detonate? I'll post a closeup pic of one of the "good" pistons for visual aid if that helps.