ME Wagner adjustable PCV valve

[Kit Coyle]

I was getting minor seepage from the base of my PCV and decided a new
one, since they are cheap, might be in order. The PCV did rattle when I
shook it which indicated it wasn't plugged. The guy at O'Reilly actually had
a PCV for a 1970 BOSS 302 which is the engine in my Cobra. He figured it
had been in stock for many years and the dusty packaging looked it. The
valve opening was bigger than the old one I pulled out. Voila, no more leak.
Intuitively, it would seem maybe the correct valve was the solution...maybe
not.

[BOBOCobra]

I have a 521 stroker with high volume oil pump and FITECH throttle body EFI. I was having problems with valve cover gasket leaks, rear main drips and oil on the underside of the opposite side breather, some other annoying drips and leaks. It was most notable if I did some hard WOT pulls while cruising around for a few hours. I put on one of these and the leaks and drips went away and the breather is clean. It made no difference on the idle or performance. I installed a small Jegs separator and it collects the mist that was sucking into the throttle body, not a lot but enough to collect and drain every 3000 miles or so. I like the fact I am not sucking that crap in the intake and the small vacuum is keeping the oil in the engine and off the floor. valve covers are clean, no drips onto the heads or exhaust. I like it, worth the money IMO but it does not make the car run better. I played with it quit a but and can get it to suck a LOT of oil so I know it works better than a stock PCV. Adjusted properly it is as advertised. That in itself is nice as there is a lot of snake oil out there.

[Gaz64]

The one thing I don't like is how the manufacturer claims the crankcase is "under vacuum" in most driving situations.
The only way this can happen is a highly restrictive breather filter is fitted, or an undersized (about 1/4 id) breather hose is connected from one valve cover to the aircleaner.

Then at anytime the engine is loaded the crankcase cannot be vented correctly. It may well not leak while idling/cruising, but will certainly leak under load.

High Performance PCV Valve Shootout – Flow Test Results – M/E Wagner Performance Products

Gary