Stock MR, COBB OTS tune. Piston skirt failure during an autocross event?

Not my car but just wondering how this even happens? Manufacturing defect?

 

Yikes.

 

Any pitting on dome?

 

That's generally caused by knock, loose piston to wall clearance, or a defective piston.

 

Signs of some light detonation but nothing drastic.

 

By any chance do you have pictures of the spark plugs?

 

And pictures of dome.

 

Did he run right map from Cobb?

 

I wish I had more pics. I'll see if I can get some. And, yes, she was running the maps right from COBB without any other mods on her car. I'm pretty sure it was detonation that killed it but I've never seen a side skirt go like that before without other catastrophic damage.

 

Oh, it happens. The term is dropping a skirt.

 

Any DTC with freezeframe? Did you move the piston rings? Cant see any opening side of the rings from this complete side.

 

Don't feel too bad,

We've all dropped a skirt at one point or another...

-pal215