Quote:
Originally Posted by Dimman
Balance has little to do with the failure causes. An L6 is naturally balanced. The problem is resonance which is affected by all the noted differences between the FA and the EJ. True that short crank H4's will have different frequencies than long crank L6, but there are still differences between motors.
However I'm not saying that it is the cause.
What I'm saying is that people dismissing it because the same part worked on a different motor need to rethink their logic. Perrin also sells 22mm rear sway bars for the BRZ which are clearly re-purposed WRX rear bars.
Now if those bars cause a handling related crash on a BRZ does logic say since they work fine on a WRX, they were not the cause (besides this hypothetical tuner's ignorance) of dangerous handling on the BRZ?
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I think it was Cosworth who posted that the bore centers are the same between EJ and FA, and as you stated, the crank on an H4 is very short. Looking at the cranks, I do not see where the harmonics going to propagate differently. I could be wrong, but I'm just going off of what is more likely.
I'm the guy wondering "Why isn't anyone questioning the untuned CAI?", known killers of subaru motors. That would be far more likely to melt things down, even though it doesn't look like anything melted from what we can see.
Still guessing it's an oil issue until proven otherwise. With the nice break-in, the car could still be burning oil at 10K miles. If it was changed at 7500, there is the chance of an improper fill, or loose drain plug. Plenty of things could go wrong there.
I'm going to go check my oil.
