Adjustable PCV Valve
 

Are they legal in Stock? Has anyone tried one? This is for an AMC 304 engine, originally equipped with a PCV valve.


http://mewagner.com/

Re: Adjustable PCV Valve
 

If they post contingency , they will be.

Re: Adjustable PCV Valve
 

Why not.

Re: Adjustable PCV Valve
 

I played with those when I still had my flow bench. Mid '70s 454" trucks had the highest flowing I found at that time. Must have been ten years ago. An NHRA Tech guy made me take mine off. I still feel like that is wrong, but I try to follow their directions. My car came with one, still feel like it should have one. Gone now.

Re: Adjustable PCV Valve
 

Ed check your pm s.

Re: Adjustable PCV Valve
 

OK, we are talking a drag race engine here so why would you want to let crankcase pressure fumes enter the intake side and taint the fresh fuel charge?

Re: Adjustable PCV Valve
 

I always thought it was a way to build crankcase vacuum. The bonus is the nitro in the oil going into intake charge.

Re: Adjustable PCV Valve
 

Don Hardy told me a couple of years ago the Ford 460 was the highest flowing pcv he had found.

Re: Adjustable PCV Valve
 

Is this better than the sterno on the top of the radiator?

Re: Adjustable PCV Valve
 

The tech sheets show the valve works with an idle vacuum above 7" Most of our stockers or super stockers do not have 7" vacuum idle.

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.

Re: Adjustable PCV Valve
 

Posting for a friend with a 2 barrel.......
He never tightens his carb bolts, and he has a hellacious throttle return spring, actually two of them....

Re: Adjustable PCV Valve
 

Wasn't illegal until a bit after this picture was taken...

Re: Adjustable PCV Valve
 

So on a small cube motor, say a 305, with a Quadrajet; no benefit from anymore air? Also asking for a friend.


Rick Thomason
GTOMayhem

Re: Adjustable PCV Valve
 

On my 301 4V I use a power brake check valve with the crankcase sealed. I like to TRY and keep some vacuum in it. I can't tell if it's worth anything but it doesn't seem to be hurting it.

Re: Adjustable PCV Valve
 

I don't think you can pull much vacuum in the crankcase with just a PCV ..Maybe with the check ball completely removed.. Would be hard to tune that set up ;-)
You need the header hoses for high speed suction. Of course, not legal in Stock.

I just use the PCV to help keep more of that thin synthetic oil inside the motor.

Re: Adjustable PCV Valve
 

So no breather on the cover? Just the brake check valve on one of the valve covers? Or being a Pontiac, the valley pan?


Rick Thomason
GTOMayhem

Re: Adjustable PCV Valve
 

Yup.