Pretty easy to make a $6 NAPA pcv valve like this adjustable...
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Just drill a hole in the plastic elbow and add a long screw to hold the pintle off the low flow position. Here's an exploded view of what's inside the above valve...
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Here's where to add the screw...
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Here's the view of the screw from inside the valve...
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I pulled the plastic elbow off the above valve and installed it on a valve that had not been cut apart. Been using the same modified valve since May of 2013 with no issues, it draws 15"Hg of vacuum in a sealed crankcase @ 2500rpm cruise. I run 12lb oil rings on the street with 5W-20 Mobil1, without crankcase vacuum it went thru a qt in about 250mi. After sealing up the crankcase and adding the modified pcv valve, I might add 1 or 2 qts all summer. Lack of oil leaks is a huge upside as well.
Grant
