These engines are for Bhisma (T-90S) which are at present using 840 BHP engines. These have been upgraded to 1000 BHP with 100% indigenous component. So nothing bad in it. Main thing is design. Even with 100% indigenous component, the design is Russian. We have to look forward to how much power could be generated by our own engine.T-90AM/SM already is equipped with 1130 hp engine. And Russia is planning to give all of it's T-90 (M, AM, A) this engine at least. If new 12H360 engine becomes economic then this 2000 hp max, 1500 hp normal output, will be given to T-90AMs. And T-72B3 and T-72B3M getting get 1000 hp engine.
India using such engines which are "obsolete " even in Russian standard. 70s and 80s era engine.
And Indian T-90s use heavy armour, hence they are far heavier thanjust 45 T.