Quote:
Originally Posted by m3alabama
Swamp I think we are both pretty much on the same page.
...my only point is I think bmw proved with the 1M that they already have the goods to reach 400 crank hp with 5-6 year old technology (n54) in a reliable fashion.
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I'm not so sure we are on the same page. You keep repeating how easy it would be to get 450 hp from 3 liters. I suppose I agree with that
in theory but in practice it takes much more than you admit (the points about everything outside of the block and heads - you seem to be ignoring)
Tuners may believe a n54/n55 is reliable with 450 hp but I guarantee BMW M engine engineers do not. Plain and simple.
As well BMW has simply not produced a factory reliable 400 hp with the n54/n55.
Quote:
Originally Posted by m3alabama
kill some more parasitic losses from the lighter valvetrain and updates a few parts could probably achieve the 450 crank number.
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In typical discussions about parasitic losses they are all after the crankshaft. Now for the very specialized topic about pre-crank or losses in the actual engine itself: You won't be making any appreciable gains (far less then 1%) from changes in the valvetrain.
We certainly do agree that a flat torque curve and linear power curve extending to around the 7k rpm range is very likely for the next engine.
Cheers.