Quote:
Originally Posted by RobBeck
Under boost (or anytime post TB pressures exceed pre TB pressures), this secondary "mystery" valve CLOSES and needs to be sealed tight or we will turbocharge the crankcase (which will in turn be evacuated by the "known" checkvalve but will likely compromise the cyclonic separators functionality as well). When pre TB pressures exceed post TB pressures, it opens and the vacuum in the intake vents the crankcase (at these times the OCC will not do anything, which isnt that big if a deal as this is at idle and very low loads where there's not much blowby anyway).
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If this part is built right into the valve cover what do you guys suggest in that case?