Quote:
Originally Posted by XutvJet
The N55 in the M2 is the same open deck block as all other N55s. It's plenty strong. The N55 in the M235 and M2 have a stronger forged crank and cylinder oil squiters. All 2014+ N55s use the S55 rod bearings and rods. The M2 N55 has a more race focused oil pan baffle.
Barring some of the earlier pre 2014 N55s with rod bearing issues, the N55 is a pretty dang reliable motor. The motor is generally simple compared to the N54, B58, and S55, easy to work on, and relatively cheap in terms of parts.
The common issues are leaks from the oil filter housing gasket and valve cover gasket and the coolant line from the radiator to expansion tank. Water pump and coil packs will likely need replacement at 70+k mileage.
The N55 in the M2 is a factory pumped up motor and doesn't have the "M" expense. To me, that's perfect for most people. It's plenty powerful and faster and quicker than 99% of the cars on the road.
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See chapter 4.1. (Engine N55B30T0) on page 19 and following of the BMW M2 Technical Training 2015 (US version):
Attachment 1361382 (72 pages - 2.5 MB).