Quote:
Originally Posted by E92Fan
Different engine block also - the 335i block is based on the previous E46 330i bottom end which is stronger than the lightweight alumnium block used in the current E9x 330i. Plus intercooler, oil cooler, larger water pump, hydraulic steering rack as opposed to electric, larger brakes... adds up quickly!
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Quote:
Originally Posted by doughboy
As I was writing it, a list of extra parts was building up in my mind!
Didn't know about the E46 bottom end - is that a cast iron block then?
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Tony beat me to it
BMW made a lot of noise about the N52 lightweight magnesium alloy engine in the 330i, but so far as I understand it they concluded that it was not robust enough for turbo charging.
As a result the 335i was built using an entirely new, heavier, but stronger engine block.
http://en.wikipedia.org/wiki/BMW_engines#Straight-6