Quote:
Originally Posted by GrimmSpeed
Yes you are correct on how it functions. We have found this design does very well at separating the oil out. IMO an AOS is soo much better than a catch can because it doesnt take oil out of the engine. catch cans you have to maintenance..you are continuosly taking oil out of your engine which of course is not the greatest for your engine. say you forget to dump out your catch can(and refill your oil) and it gets full of oil... you are now running with a bunch of oil missing which is no good.
Justin
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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.
Just because all that oil coming out of the heads will get pumped back into the driver's valve cover doesn't necessarily mean it's not a problem.
IMO, if you've got a car that needs a drain-back catchcan/AOS, you've probably also got a car that has a big turbo and see's lots of lateral G's that needs separate crank and valve breathers.