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I had a customer with a mild tune on his car coming to the shop because the car would smoke a lot
After full diagnostic, it needed a rebuild since the second compression ring touched and broke a part of the lower side of the piston. Top ring looks great too. It doesn't look like it touched
Top of the piston has no pitting, spark plug looks good, I wasn't able to find anything that might have caused that.
The person who drives the car has absolutely no mechanical sympathy (and probably not much of a brain) so I'm pretty sure he did something but, like any customer, he was driving slowly on a road when this happened.
Anyone has insight on what might cause this?
