Well, if he were to vent both sides of the PCV system straight to atmosphere (through filters) and not use vacuum, it would *probably* work. I think the only downside there is that it's only the blowby pressure that will occasionally force a small amount of air out the breather side and/or PCV valves (whichever is least resistant). Thus pressure will be somewhat regulated and sane. But you won't really clean the ugly vapors out of the crankcase much either with no real flow or air exchange.
Running breathers on the intake side as pictured is fine, IMHO. It's really not much functional difference from the stock configuration where the intake air filters play the role of that breather (and as a bonus - sometimes there is flow reversal and/or backfire through that line - at least that won't be going into your intake). But on the other side, you should hook up vacuum through a catch can. This will actively draw negative pressure on the crankcase and keep fresh air coming in through the breathers to replace it. If you were to vent the catch can to air and cap off the vacuum, the catch can won't really do anything (you might as well be venting both sides to air as above).
Last edited by wstar; 06-22-2013 at 03:26 PM.
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