Quote:
Originally Posted by XutvJet
Rod bearing failures on the EWG N55s are rare. Like you said, when they fail in the EWG N55s, it's usually because of high lateral sustained Gs during track driving. The fix is the S55 oil sump parts swap.
With that said, with your mods, you are pushing the safeguard limits of the N55. One bad knock event could hammer the piston so hard that it squashes the oil film between the rod bearing and crank.
I strongly suggest never going moderate to heavy throttle in a tall gear (3rd and above) at rpms below 4000rpms. This is called a high load situation which can introduce a huge surge of boost and potentially low speed preignition (LSPI). In stock form, then DME is quick enough to respond to keep this from happening. With Stsge 2 and beyond mods, the DME might not be able to keep up.
While good practice,, changing oil often really isn't going to do much for preventing spun bearings.
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Correct me if I’m wrong but to my knowledge, there are a select few N55 engines that superceed the build date of 09/12/2012 with the pwg, that have the new rod bearings. All of these cars are 2013 models but according to bmw, that’s the day they switched which rod bearings were used. Another thing as Ik this thread is old and this is now more well known, but anytime you disrupt the oil circulation, ex: changing the ofhg, you need to prime the engine. FCP Euro has multiple videos demonstrating how to do so.