Quote:
Originally Posted by g20beam
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.
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Sorry matey, you are possibly wrong on many things. To start with look at the picture below, different compressions between the 46 and 48 and both are neither 11:1 as you claim the M340i is. There is much nuance between car models. I know we all want our 330i’s to be exactly the same as the M340i’s engine, just a little smaller, but this may not be the case.