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Originally Posted by 911pcars
Crankcase blowby exits the engine at a retatively high velocity. Routing this into the oil tank allows most of the liquid oil to separate from pressurized gases/air. The oil tank provides an area that allows the blowby/oil mist flow to decrease so a smaller tank can further separate liquid from vapor.
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From that, I gather the typical catch can is too small if connected to the breather hose directly and the oil loss would be excessive if the blowby is not routed back to the oil tank.
Quote:
Another plus 1 to not allow condensed H2o, raw fuel, other liquids, etc. to drain/return to the crankcase.
Sherwood
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That's the rationale for my previous question i.e. given the blowby oil is contaminated stuff anyway, why not filter first before dumping it back into the oil tank to be recirculated if the oil loss is acceptable.