Originally Posted by flinchy
I'll have to find it when i get home (at work now ish)- the main (one of the) goals was light weight, theyr'e diamond shaped for less weight, and of course forged
And no, the reason they chose mg alu is because they have the same heat expansion characteristics so the block stays even
If you found the right one, from memory it has magnesium piston heads
Other facts: the camshafts are hollow hydroformed.
The n52 is the most technologically developed engine bmw's made, lightest (while still strong) materials, lightest everything, theres a reason it holds a record to do with that lol.. The only crazy electronic type tech on it though, is the valvetronic which appears to be fairly bulletproof lol
Ed: and on the orher topic, yes, if a 128i and 135i have the exact same suspension and brakes (and wheels ad tires) the 135i will be outperformed in all aspects other than acceleration.
Whats diamond shaped?
The reason mg was used was to save weight. Not due to similar expansion. Mg is lighter than Al and relatively strong(not as strong as Al). The N52 engine is not suitable for high hp applications. Thats pretty much a known given. The engine was developed using BMW's "Green" program. If it were as strong as the N54/55 units it would have been used in the 135's, 335is and 1M. A M car would certainly sport a lighter weight engine if any. They use N54's because they're stronger. Its that simple.
You didnt address my question regarding the 4g plant. Im curious to know what you mean.
Whats a Mg piston head? You cant forge Mg.