What was found
"ON NOVEMBER 13, 2010 AT APPROX NOON, EXPERIENCED AN EMERGENCY. FLYING APPROX 8 MILES NORTHWEST OF AIRPORT AT APPROX 3,000 FT AGL. HAD DEPARTED AIRPORT AT APPROX 11:30 PM. THE ENGINE SUDDENLY BEGAN RUNNING VERY ROUGH CAUSING THE AIRFRAME TO SHAKE SLIGHTLY. REDUCED POWER TO ELIMINATE THE AIRFRAME SHAKING AND BEGAN LOOKING FOR A LOCATION TO MAKE AN EMERGENCY LANDING. NOTICED THE SMELL OF BURNING OIL AT ABOUT THE SAME TIME THE ENGINE BEGAN TO RUN ROUGHLY. ALSO NOTICED A SMALL AMOUNT OF BLACK SMOKE BEGINNING TO ACCUMULATE NEAR MY FEET." PILOT STATED. THE NR4 CYLINDER BARREL WAS FOUND TO BE CRACKED 90 PERCENT AROUND THE CIRCUMFERENCE AT MID BARREL.