Quote:
Originally Posted by GuidoK
You're comparing apples and oranges. The s54 is a NA engine with an output over 100hp/L. It has one of the highest piston speeds available. Those are specs for a thourougbred race engine, and that comes at a price. Everybody knows that you can build a more reliable engine when using boost if you want a high hp/litre ratio but that is not the point of this engine.
If you want to compare this eninge to anything else, you have to look at ferarri v8's etc (maybe the s2000 gen1 engine) and they have their own issues and are definately not more reliable (even the s2000 engine has it's problems)
I can compare your 2jz to loads of truck engines that do 2million miles with ease and say that a 2jz is an appallingly unreliable eninge.....
As long as nobody can build an engine that uses the same techniques (so NA), roughly the same size and achieves the same specific output (100+hp/L) and is clearly more reliable, the s54 is not poorly designed. Nobody does it better, and certainly not in 2001.
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There is no defense for the S54 rod bearing issues, it is what it is. The S65 is having problems with rod bearings as well. BMW needs to address their issues. I believe the oil pump relief pressure on the S54 is 58PSI, for 8K RPM.....