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piston question

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Old Apr 24, 2007 | 08:42 PM
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From: cola sc
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I have a 61 vette that has a 327 in it. I was tearing down the engine today when I noticed the #4 pistons compression ring was broken. No big deal, I thought. However, upon further inspection, I found that both bottom rings were being pinched by the piston- that is, while the top of the piston was flat, from the compression ring down in one small area was literally pinching the piston rings, preventing them from moving at all. the piston was actually sagging in that one area. however, the top was flat, the piston is round, and the cylinder is unscathed.I have NEVER seen anything like this. can someone explain this to me? If need be, I can post pics


and the car has .030 forged popup speed pros........
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Old Apr 24, 2007 | 08:45 PM
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Detonation?

Doug
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Old Apr 24, 2007 | 09:33 PM
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From: cola sc
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maybe.... anyother thoughts?

Last edited by draakarmaul; Apr 24, 2007 at 09:34 PM. Reason: pics sucked
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Old Apr 24, 2007 | 11:06 PM
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Yep ! I have seen detonation do just that ! Dome pistons ??
Pops
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