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Old 10-12-2012, 10:11 PM   #20
SkunkLookingCarSkunkLookingCar is offline
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Disclaimer: Please don't think I am trying to start an argument. Tone is a difficult thing to portray through he interwebs. Metal is just something that I am extremely interested in and I don't want my enthusiasm to give the wrong impression.

The only problem with the nicks being on the underside of the piston is that that side experiences predominantly tensile stresses versus compressive stresses. Cracks will propagate under lower tensile stresses faster than higher comperssive stresses. There is a good chance that the pistons will be fine for quite some time, but I'm worried about the collateral damage and time to replace if one of the damaged pistons let go. Also, you mentioned that they have 90K on them. Aluminum doesn't have a fatigue life. All aluminum will eventually fail under any sort of cyclic loading; higher stresses and higher temperatures will expedite that. I would be delighted if I got 90K@12psi especially considering there was damage to them.
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