Quote:
Originally Posted by serialk11r
Old Mechanic, how about flat-4 engines? I know Subaru doesn't use balance shafts, and the EJ25s are pretty rev friendly I believe (although that may be because they have a somewhat short stroke).
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The thing about the EJ25 is that a stock crank will physically destroy itself past 8k RPM. I don't know if it's just the huge bores or the firing order. But it's for that reason I don't believe the flat four is any more smoother than a straight 4. The EJ25 is the one with the problem though since the JDM EJ20 will rev to 8k no problem.
As for big 4 bangers, one of the old Mercedes racing engines was huge compared to today's 4 bangers. 5.9L
Mercedes 35hp