Quote:
Originally Posted by Razor2010
Quote:
Originally Posted by VipinLJ
I think he knows that. I’m guessing his (and my) doubt is whether the B46TU/B48 (EU) engines are basically the exact same (when it comes to internals and gearbox and stuff) as the B58 in the M340i. Just two cylinders and a few hundred cubic centimeters less.
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We should all do some more digging. Even the 330i USA spec and non-USA spec have different internals to each other, so not hard to imagine the B58 having different to the B48/46. I would argue the same for the gear box. |
Let's clear up the confusion.
B46 and B48 difference is B46 has SULEV parts. Super Ultra Low Emissions Vehicle. Pretty sure those differences are made to match emissions laws in California. Anyhow, the layout of the B46 and B48 are the same, so is the engineering. The B48 has the same quality components as B58, at least the new TU engines are the same. The 190kW version of B46/B48 uses same quality materials for crankshaft, pistons, block and head as the 285kW B58. The compression ratios are all 11:1. Same with cylinder bore and stroke. The B46/B48 is, in essence, the B58 with two less cylinders, this all is fact.
SULEV or no SULEV, all these are, are more expensive parts. Doesn't affect reliability or power output as far as I'm aware. If a component such as pistons, crankshaft or any of above mentioned components fail in the B46, it will have the same chance of failure in a B48 or B58, if the B58 was pushed to the same stress extent as the B46/48 is.