Click here to enlarge Originally Posted by Newguy123 Click here to enlarge
what do you mean its that much weaker? based off of what? a guess, your opinion? i havent seen any blown up N55s and they have been making 550whp for over a year now. we've seen n54 pop with less power. what we do know is the n55 has a bigger intake cam and a better flowing head then the n54, only time will tell but i dont think its any "weaker" then the N54 just tuning limited
I've had an N55 for 5 years and I still have it. Two years ago I had my engine out to get replaced because of some bull$#@! valvetronic lockup or something that came out of nowhere. The engine was out and the shop was also working on an N54 motor swap as well. When the internals were compared the N54 was greatly more robust. I had pics compared everything but they're on my old phone.

So so no I am not guessing by my "opinion" but cold hard factual comparisons. There have been blown N55's. One thru a rod a couple months back. It's on N54Tech. Head may flow better and what not but that's not surprising. BMW had to make up for the weaker internals somewhere didn't they?

I am speaking for my E92. BMW clearly made the N55 stronger for M235/M2.