Quote:
Originally Posted by mkoesel
I an understand and appreciate this line of reasoning - that the I6 just can't provide any additional displacement while a V6 of course, could. I do agree that the 91mm bore center of the modern BMW M50-based I6 architecture won't likely yield an aluminum engine above 3L. However, as I have said in the past, I don't think more displacement is needed. I believe that 150hp/L is not only achievable by M Division, but in fact they will be blowing well past that figure in the coming generations of their engines. Current rumor suggests that the next generation of non-M BMW engines will be designed for up to about 136hp/L. To me it would be foolish to bet against 150hp+ from the M Division. In fact, I would not be surprised to see a them hit 170hp/L from their imminent turbo I4 engine.
When you think about it, Mitsubishi had a 150hp/L I4 some fifiteen years ago, right? Probably more, even. How is logical to believe M cannot match that today?
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I believe Mitsubishi gone upto 200hp/liter in one of the EVOs. There was a massive lag though... More power/liter means more boost which means more lag. That could be limiting factor even though there are ways of reducing the lag.
Also, you have good points about my previous on using V6 to create more interior room.