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While engine speed is a factor, cylinder pressure is the main design factor when it comes to rod bearings. With the N54/55 being turbo engines, engineers knew that these bearings would typically be exposed to higher loads from the higher cylinder pressures of turbo engines. Because of this, the rod bearings were most likely designed with a more conservative safety factor. What high engine speed really causes problems with is wear at the piston ring/cylinder wall interface.
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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