12 year old thread popped into mind, tonight. I think this is relevant. This is what happens when you try to make too much power or perhaps mild detonation when there's not enough material to the first ringland. It can fail in the weakest point of the piston:
From another thread, but didn't want to dig up two long-dead threads for 1 subject:
It's very possible that he was talking about the very piston pictured above. If not, that piston is an RNH built 3.4" stroke, 5.4" rod, 1.09 compression height
Diamond custom piston, just like the one he described. Now, the other pistons in the same motor survived, and I'm not saying that a thicker CH piston with lowered ring pack would've survived. I'm just saying that it looks like this motor went to the ragged edge of the piston's design limits and this one didn't survive. More material might have helped.
I'm undecided on whether to replace this single piston, assuming that's still possible, or the entire set. Having looked directly at the difference in custom pistons in two very similar cars, I believe the CP pistons to be superior to the Diamond pistons. If anyone is interested in the direct comparison of the top view, let me know. When I get this piston out, I can take some side-shots to compare the ring-packs.
From another thread, but didn't want to dig up two long-dead threads for 1 subject:
Chris, yes there are many variables with the longer rod, and many things can be done with a custom piston to give integrity and strength. It depends on budget, over all expectations and use of the vehicles. They say the longer stroke will help spool the turbo quicker but there are a ton of variables to that statement, which you and I both know.
I have a set of custom diamonds for a customer currently, 4.125" bore 3.4" stroke, 5.4" rod and they are very nice
It's very possible that he was talking about the very piston pictured above. If not, that piston is an RNH built 3.4" stroke, 5.4" rod, 1.09 compression height
Diamond custom piston, just like the one he described. Now, the other pistons in the same motor survived, and I'm not saying that a thicker CH piston with lowered ring pack would've survived. I'm just saying that it looks like this motor went to the ragged edge of the piston's design limits and this one didn't survive. More material might have helped.
I'm undecided on whether to replace this single piston, assuming that's still possible, or the entire set. Having looked directly at the difference in custom pistons in two very similar cars, I believe the CP pistons to be superior to the Diamond pistons. If anyone is interested in the direct comparison of the top view, let me know. When I get this piston out, I can take some side-shots to compare the ring-packs.
