As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT HEARD BANG BUT ENGINE CONTINUED TO PERFORM NORMALLY. APPROXIMATELY 2 MINUTES LATER THE ENGINE BEGAN TO SHAKE VIOLENTLY WITH NOTICEABLE POWER LOSS. AIRCRAFT LANDED AND ENGINE WAS SHUTDOWN. POST FLIGHT INSPECTION FOUND #2 CYLINDER PISTON PIN BROKEN, PISTON PIN BOSSES BROKEN OFF BOTH SIDES, SEVERAL SECTIONS OF THE PISTON BROKE AT THE BOTTOM.