What was found
(CAN) PILOT FLYING IN CRUISE AND HEARD A LOUD BANG. ENGINE CONTINUED TO ROTATE FOR A SHORT PERIOD AND THEN SIEZED. UPON LANDING 2 LARGE HOLES WERE DISCOVERED IN THE CRANKCASE WHERE THE NR 3 & NR 4 CONNECTING RODS HAD COME THROUGH THE CRANKASE. UPON DISASSEMBLY IT WAS NOTED THAT ALL THE CONNECTING RODS WERE AFFECTED BY A LACK OF LUBRICATION. THIS IS SUSPECTED TO HAVE OCURRED WHEN AN EXCESS AMOUNT OF CARBON WENT THROUGH THE OIL PRESSURE RELIEF VALVE IN THE OIL PUMP, THEREFORE CAUSING A LOW OIL PRESSURE/FLOW IN THE ENGINE BECAUSE THE VALVE COULD NOT SEAL DUE TO THE CARBON FRAGMENTS.