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      12-31-2013, 01:52 PM   #76

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Originally Posted by SamS View Post
I believe whatever comes after the B is the number of .5L cylinders.

B38 = 1.5L 3cyl Gas
B37 = 1.5L 3cyl Diesel
B48 = 2.0L 4cyl Gas
B47 = 2.0L 4cyl Diesel
B58 = 3.0L 6cyl Gas
B57 = 3.0L 6cyl Diesel

Now obviously the B58/B57 don't follow these guidelines. So either they just skipped using the B68/B67 monikers, or maybe the N55 replacement code has been reported incorrectly.
B is just a code for a new generation of engines.

It was M, then N (which actually stands for New Generation) and now it appears to be B.
Numbers that come after the second B(which stands for Benzene) or D(Diesel) show the displacement.

BMW didn't skip anything, they use the same system to show cylinder numbers for over 20 years now

N2# - 4cyl (successor to NA 6cyl)
B3# - 3 cylinder (new)
M4#, N4#, B4# - 4cyl
M5#, S5#, N5#, B5# - 6cyl
M6#, S6#, N6# - 8cyl
M7#, S7#, N7# - 12cyl
S8# - 10cyl

Last edited by SickFinga; 12-31-2013 at 06:25 PM..