Quote:
Originally Posted by Transfer
Good luck getting 110 HP per liter in a street production NA engine BMW which is a far cry from the >125 HP/L you're implying. The S65 was created for what you're asking.
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Still that is exactly what Porsche did already a few years ago in the 997 GT3 4.0 RS and now with the much cheaper 991 GT3. 125hp per liter in a street production NA engine. The M division can usually keep pace with Porsche with their engines to a much lower price. It's not likely they will go this route but do I think they are able to , you bet. Someone on the F80 forum looked at the cylinder spacing and thought that the S55 can likely be bored to close to 4 liter if needed and it's over squared with potential for high rpms without reaching unheard of piston speeds. I actually think it can quite easily be converted into a 380 hp NA engine by the wizards of M. Most likely though it will just be a further tweaked N55 or a de-tuned S55. All BMW engines are now FI, NA is dead and buried in Munich, sadly enough.