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Originally Posted by dmboone25
As a result, if any version of the N55 is to be used in the next M3/4, it will need all the overhauling to which you refer above.
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Sure. And my point is that such revisions, if rumors can be trusted, are exactly what is in store. So, nothing to worry about at this point.
Quote:
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As a result, if any version of the N55 is to be used in the next M3/4, it will need all the overhauling to which you refer above.
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But if we are honest, the same applies to the N54 too, though.
That is to say that, neither an N54 nor N55 in any current form has any place in an M3. The slightly tweaked N54 was OK for the short-run, entry level 1M designed to slot in below the 400hp+ M3, but it would never go over well in an actual M3/M4.
In other words, we shouldn't really be concerned with which engine is forming the basis of the M motor because, no matter what they choose, it will more assuredly behave nothing like its series counterpart. If you take an engine, strengthen the block, and replace the cylinder head and induction system, what really are you keeping? Just the basic architecture, i.e. bore center, deck height, and perhaps select parts such as from the timing assembly etc. Whether you start with an N54 or an N55, you are going to end up with something very similar in the end. If we were to scrutinize an N54 and N55 shortblock, which one comes up the winner? Probably neither as it is just a block, crank, pistons etc. And the latter two will probably be swapped for stronger parts for the M motor anyway.