Quote:
Originally Posted by Razor2010
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 B48TU 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.
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I dont really get that document, it refers to B48TU as compression ratio 9,6:1 and output of 306hp but its only the m35i models thats equipped with that engine. Here in sweden my 330i has the B48B20 with 10,2:1 compression ratio. And checking the internals compared to B58TU my engine is using exactly the same internals.