PERFORMING FIRST TKOF ON A NEWLY INSTALLED ENG; PLT OF C340 EXPERIENCES PARTIAL PWR LOSS AND ATTEMPTS A RETURN TO DEP ARPT. PLT DISAGREEMENT WITH DEP CTLR REGARDING HIS ACTIONS.

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I WAS MAKING A TEST FLT FOR MAINT AT CAE; RWY 11. I ASKED GND CTL FOR AN UNRESTR CLB TO 10000 FT TO ORBIT THE ARPT. I EXPLAINED TO GND CTL AND THE TWR THIS WAS THE FIRST TEST FLT IN FACTORY NEW ENGS. I WAS ASSIGNED RWY HDG TO 2500 FT. AT ABOUT 1000 FT I BEGAN TO LOSE MANIFOLD PRESSURE ON THE STARBOARD ENG WHILE I WAS BEING HANDED OFF TO DEP CTL. I IMMEDIATELY ROLLED INTO A L TURN TO ENTER THE L DOWNWIND TO RWY 11. THERE WAS NO TIME FOR EXPLANATIONS. ABOUT 50 DEGS INTO THE TURN I TOLD DEP WHAT I WAS DOING. HE INFORMED ME I WAS ON AN ASSIGNED HDG AND ALT. I TOLD HIM WHAT I HAD EXPLAINED TO GND CTL AND THE TWR; BUT HE SAID HE HAD NO COM FROM THEM. I TURNED OFF THE BOOST PUMP AND THE PROB CLRED UP; SO I CONTINUED MY CLB. I WAS IN UNRESTR VFR AND THERE WAS NO CONFLICTING TFC. THE CTLR WAS NOT HAPPY WITH MY ACTIONS BUT THE NTSB IS FULL OF ACCIDENTS BECAUSE PLTS WERE BUSY TALKING TO CTLRS INSTEAD OF FLYING THE AIRPLANE. I AM CONVINCED YOU SHOULD EXPLAIN ANY DEV WHEN THERE IS TIME BUT ALWAYS THE FIRST PRIORITY IS FLY THE AIRPLANE.