Blown Turbo?

Hello everyone,

I know I already posted the same topic in a different part of the forums, but I didnt notice that there is a specific section devoted to turbo's and all that; but anyways can anyone help me or give me a hint about how to check for a blown turbo? or atleast give me some "symptoms" of one?

Because I recently rebuild a 1985 Maserati Biturbo 2.5L engine, and on start-ups it creats smoke; however in about 10 mins it stops smoking but once the throttle is pressed and the engine revs past 2000rpm's it begins to smoke again. I was thinking that it might be because the engine is not broken in yet, or also becuase of alot of oil deposit in the catalytic convertor, since before the rebuild the oil seals were bad and the valves allowed oil to leak down into the pistons....eventually clogging up the catalytic convertor.

But I also read on one of Maserati's forums that if the engine makes a lot of smoke it might be because of a blown turbo...so if anyone can help me, or atleast give me an advice, that would be great! Thank you!