C210T HAS ENG SURGE AND PWR FLUCTUATIONS SHORTLY AFTER TKOF. ATTEMPTED RETURN LAND.

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I WAS CLRED FOR TKOF ON RWY 5R AT IND. THE DEP WAS NORMAL AND AT APPROX 500 FT AGL I MADE MY FIRST PWR REDUCTIONS TO 30 INCHES AND 2500 RPM WHEN A VERY QUICK PWR FLUCTUATION OCCURRED. THIS HAD MY UNDIVIDED ATTN AND I QUICKLY CHKED THE MIXTURE AND TEMPS WHICH APPEARED IN THE NORMAL OPERATING RANGE. I CONTINUED TO CLB FOR APPROX 4-6 MINS WITH NO OTHER INDICATION OF PWR SURGES OR HIGH OR LOW TEMPS. AT APPROX 4000 FT THE ENG BEGAN TO SURGE AND FLUCTUATE RAPIDLY AND IMMEDIATELY I NOTIFIED ATC (DEP AS I WAS ON AN IFR FLT PLAN) OF MY PWR FLUCTUATIONS AND I THEN WENT THROUGH THE ROUGH ENG CHKLIST PROC AS I TURNED BACK FOR IND. THE CTLR CLRED ME DOWN TO 3000 FT AND I NOTIFIED HIM OF A RAPID LOSS OF PWR. AT THIS TIME A LOUD BANG (MECHANICAL NOISE) WAS HEARD FROM THE ENG COMPARTMENT WHEN I NOTICED THE RPM INDICATOR READ 0 RPM. IT BECAME EVIDENT THAT AFTER THE RESTART PROC WOULD NOT WORK; I WAS NOT GOING TO MAKE IND ARPT AT BEST GLIDE SPD. I NOTICED AN ARPT AT MY 10 O'CLOCK AND (ESTIMATED) 4 MI AND ADVISED THE CTLR THAT I WAS HEADING TO THAT ARPT. HE ADVISED ME THAT IT WAS 3SY SPDWAY AND HE HAD NO KNOWN CONDITIONS. I ADVISED HIM OF SOULS AND FUEL ON BOARD. I THEN COMMENCED WITH THE OFF ARPT LNDG CHKLIST (EMER CHKLIST); SHUT OFF FUEL ON SELECTOR AND PULL THE MIXTURE; ALSO CHKING FOR OTHER LNDG LOCATIONS. IT BECAME APPARENT THAT I WOULD NOT REACH THE FIELD (DIRECT 35 KT HEADWIND) AND OPTED TO LAND IN A FIELD BEHIND AN ELEMENTARY SCHOOL WHEELS UP AND NOTIFIED THE TWR AND PROCEEDED TO LAND AND EVAC THE ACFT. THE ONLY DAMAGE TO ACFT VISIBLE WAS 2 BENT BLADES ON PROP AND A SMALL BIT OF THE TIP OF THE ELEVATOR. I WAS ABLE TO CALL THE TWR BACK AND LET HIM KNOW I WAS FINE. THERE WERE NO INJURIES AND MINIMAL DAMAGE. THE NTSB WAS NOTIFIED AND WOULD BE OUT THE NEXT DAY TO INVESTIGATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE ENG PROB WAS DUE TO A SPLIT RING IN THE TURBO CHARGER. THIS RING WAS INSTALLED IMPROPERLY WHICH CAUSED IT TO DISINTEGRATE. THE PIECES WENT INTO THE ENG AND BLOCKED THE OIL FROM GOING TO THE ENG. THE LAST CYLINDER OVERHEATED AND BLEW A ROD. THE COMPANY DOES NOT DO ITS OWN MAINT. THE MANUFACTURER HAS TAKEN RESPONSIBILITY AND REPLACED THE EQUIP AND PAID FOR DAMAGES. ACFT WAS C210T. THIS WAS A NIGHT OP AND RPTR WAS NOT SURE WHERE HE WAS LNDG UNTIL ABOUT 15 SECONDS BEFORE HE TOUCHED DOWN.