MD80 FLT CREW REJECTS TKOF FOR LOW POWER AND HIGH TEMP AND LEARNS FROM MAINTENANCE CONTROL THAT THE ACFT HAD THIRTEENTH STAGE BLEED VALVE ISSUES ON THE LAST TWO TKOFS.

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ON TKOF ROLL; PWR WAS ADVANCED ON BOTH ENGS BY FO. L ENG WAS NORMAL AT 1.85 EPR. R ENG THROTTLE WAS MATCHED TO L THROTTLE; BUT R ENG EPR WAS 1.6 EPR AND EGT WAS 590 DEGS. FO PULLED R THROTTLE BACK TO PREVENT OVER-TEMP. NOTING THAT EGT WAS HIGH; EPR WAS LOW AND REALIZING R ENG WOULD NOT REACH NECESSARY PWR; I ELECTED TO ABORT TKOF. TKOF WAS ABORTED AT 75 KTS AND WAS UNEVENTFUL. MECH CHKED ENG AND FOUND SEVERAL LARGE PIECES OF ACOUSTIC INSULATION IN AFT SECTION OF ENG. MECH ALSO FOUND METAL RING INSIDE ENG COWLING. MAINT CTL TOLD MECH TO LUBE ENG BLEED VALVES AND PERFORM RUN-UP. I TOOK PLANE OUT TO TXWY AND PERFORMED RUN-UP. R ENG START WAS NORMAL TO 40% N2. N2 THEN CLBED TO 46% AND EGT WENT TO 550 DEGS. ENG WOULD NOT ACCELERATE BEYOND 46% N2. TAXIED ACFT BACK TO RAMP. I INITIATED CONFERENCE CALL WITH DISPATCH AND MAINT CTL ABOUT PROB. DESCRIBING PROB; MAINT CTL SAID 13TH STAGE BLEED HAD FAILED AND METAL RING WAS PART OF THE BLEED VALVE. AN ENG CHANGE WOULD BE NECESSARY. FLT WAS CANCELED. MAINT CTL ALSO TOLD ME IN THE CONFERENCE CALL THAT THEY KNEW THE 13TH STAGE BLEED VALVE WAS FAILING! THE MAINT CTL MECH SAID THE ENG WAS RUNNING VERY HOT ON A PREVIOUS FLT OUT OF TWO OTHER ARPTS. I AM VERY CONCERNED THAT MAINT CTL KNEW THE R ENG HAD A PROB; BUT ALLOWED THE PLANE TO BE DISPATCHED. HAD THE BLEED VALVE FAILED CLOSER TO V1 OR IMMEDIATELY AFTER TKOF A DANGEROUS ACFT EMER WOULD HAVE RESULTED. LETTING THIS ACFT BE DISPATCHED WITH A KNOWN ENG PROB PUT MY CREW AND MY PAX AT AN UNNECESSARY AND MUCH GREATER RISK. THIS IS UNACCEPTABLE.