Quote:
Originally Posted by GuidoK
ok, but the crankshaft bearings don't have any problems. They also aren't exposed to enormous G forces. That is what's critical about rod bearings. And the S54 is of course higher revving, and the crank stroke is also bigger (91mm vs 89mm), and those alterations increase g forces squared, so also the chance of cavitation erosion wear, what is happening in the rodbearings.
But in truth I couldn't tell whether a thicker or thinner oil gives more cavitation under high g forces. And part of that cavitation might not even be caused in the rodbearings themselves as the pressure regulator piston in the S54 also wears, so that's bouncing around like crazy too.
Have you removed the oil thermostat from the filterhousing?
Why?
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Doesn't really matter as long as the oil temps are under control. And like I linked, the N55 rod bearing clearances are even bigger than the S54 and the recommended oil is even thinner than what I use.
Yes, it's replaced with a dummy for higher flow and better cooling.
https://www.mk-motorsportteile.de/en...mmy-m3-e46-s54