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      09-26-2013, 12:32 PM   #39
BavarianBullet
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Drives: 2014 Audi S5
Join Date: Jul 2008
Location: Connecticut

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Sorry to see the engine blew.

It's just a cracked piston crown like a lot of the failures. Could be a lot of things but at that performance level, things can and will happen.

The piston looks like it does because you drove on it for a while. It won't take long for combustion gas from a big crack like that to melt the piston and rings.

One thing to watch out for is that the piston parts probably exited out the exhaust valve and likely hit the turbine on the turbo on that cylinder. I'd definitely send at least that one back to RB or pull the CHRA out of the exhaust manifold and look at it real close. A dinged turbine will be unbalanced and could toast when you reinstall it. Better safe than sorry.
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2014 Audi S5 DSG
2011 335xi Sedan (retired)
2008 335xi Sedan (retired)
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