Re: Adjustable PCV Valve
 

Interesting subject, I hope more with contribute to this thread.

Re: Adjustable PCV Valve
 

It's air.

Re: Adjustable PCV Valve
 

^^^^^^^^^^^^^^^^^^^^^^BINGO^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^

Especially in a severely restricted engine.

Re: Adjustable PCV Valve
 

Who says it has to work? (Or work as the emissions system was designed?;-)
Remember those NASCAR and other intakes with the drilled out mounting studs? This is a lot bigger hole.

Re: Adjustable PCV Valve
 

[QUOTE=Bobby DiDomenico;581432]Who says it has to work? (Or work as the emissions system was designed?;-)

Yeah, and nobody ever clipped a spring, with a restricted engine that, naturally, pulls manifold vacuum @ WOT, right?

Re: Adjustable PCV Valve
 

Just like another throttle blade, kinda bad mixture at idle but wide open a good increase, just richen up the jets. Big breather on other valve cover, not much oil spray. Would be interesting to see what cfm goes thru it. I can see why tech would shoot it down.

Re: Adjustable PCV Valve
 

I have heard of guys using epoxy & a drill to convert the PCV hose nipple from manifold vacuum, to "ported" vacuum, which only pulls air with the throttle blades open. Just heard stories about that. Don't really know.

Re: Adjustable PCV Valve
 

I had one that rattled when I shook it. I thought it was broke "So I fixed it".

Re: Adjustable PCV Valve
 

There are guys running check valves from power brake units instead of the pcv valves. Its a poor mans vacuum pump. was always told if you could keep some vacuum in the crankcase say 3 in it would free up some power. Remember for all the air that is moving on top of the piston there is air moving below it also. Back in the day they said it helped ring flutter. But with todays ring combos who knows. Tom

Re: Adjustable PCV Valve
 

Back in the 70s I used a hemi fuel pump hooked to a PCV on my max wedge 64 Plym (later valve covers) I did it mostly for blow by, had to use a catch can so it was doing something.