Quote:
Originally Posted by sperry
What concerns me the most is the lack of size differentiation between the crank breather and the head breather. Perhaps it's not an issue on the STi due to the extra pair of unbaffled valve breathers on the STi's heads, but WRX heads will see crank pressure and potentially start pumping oil out the breathers if the crank breather can't breath significantly more than the valve breathers.
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I've heard you mention this before, and I dunno is I buy that. The difference between a 5/8" line and a 1/2" line is not much, and the crankcase breather line has a significant (and obviously on purpose) restriction in it near the PCV valve.