What was found
1.8 HOURS AND ON SECOND FLIGHT AFTER INSTALLATION OF 6 NEW PISTONS PN AEC648029 WITH 6 REWORKED CYLINDER ASSEMBLIES, THE ENG EXPERIENCED A CATASTROPHIC TOTAL ENG FAILURE, MINUTES AFTER TAKEOFF DEPARTURE FROM AIRPORT. POST INCIDENT INVESTIGATION FOUND NR 2 CONNECTING ROD AND WRIST PIN HAD EJECTED THROUGH TOP OF ENGINE CASE WHILE IN FLIGHT. TEARDOWN OF ENGINE BY REPAIR STATION FOUND NR 2 PISTON BROKEN COMPLETELY IN HALF AT OIL CONTROL RING GROOVE, AND SECTIONS OF THE BROKEN PISTON SKIRT HAD CONTACTED CRANKSHAFT WHILE IN ROTATION. CRANKSHAFT WAS DAMAGED AT COUNTERWEIGHT ATTACH POINT, AND NR 1 AND 2 CYLINDERS AND CONNECTING RODS DAMAGED. REQUEST FOR DETAILED ANALYSIS OF FAILED COMPONENTS SUBMITTED IN SAFETY RECOMMENDATION TO FAA OFFICE OF ACCIDENT INVESTIGATION AND PREVENTION, AVP-420.