Quote:
Originally Posted by sspdw
You are referring to the B48A20T1 found in x2 35i and m135/m235i, and yes it seems to have more solid internals than B58TU. Though i would think this engine is developed to acheive up to 400hp in later configurations. The B48/46B20O1 has got a forged crankshaft and many technical updates as to the old B48.
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Unfortunately, I think this is incorrect. The B48 has the upgraded crank, pistons and bearing(s). The B46 / B46TU does not. Scroll back through this thread and you will see a post where I provided links to this and also read that technical training document that I posted that also states the same.
I guess there is a possibility that the B46TU has the same internals as the B58TU but different to the B48TU. I would find this odd though. You bump up the HP and TQ significantly from the B58 to the B58TU but fail to upgrade the internals (crank, pistons and bearing(s)) of the B58TU and keep them as-is on the B46TU. Anything is possible I guess. But again, the fact remains that as per BMW, 100% the internals are in regards to the crank, pistons and bearing(s) different between the B46TU and the B48TU.