Sorry I'm no help with this one but why do people take them off to begin with? Is there some myth out there that PCV valves rob power or something? Surely you aren't required to remove it just to install a blower are you? What do all these 9 second Pro 5.0s running 27 lbs of boost do? What does a Terminator use for PCV?

 

Remove the blower belt and take it for a ride if its still happening its blow by not related to the PCV system much you can do about it

My car is starting to blow the stick out again but I am not getting any oil (yes its full) and it did the same thing without the belt. I have one breather in the pass VC I need to install another

 

I would think you would still want to run with a PCV even if you installed breathers. Although I have not had these probelms here's what I did.. I left the PCV and all the lines intact and since I run Ford Motorsport valve covers I installed a breather/filter cap that has a hose fitting on it. I then ran a 3 -4' hose down in the rubber mass air and AFM power pipe pipe coupling, it same place where the IAT sensor is.. I don't see any oil in the intake either. If you need more venting you could intall a second line in the drivers side.

 

sounds like you have alot of pressure building up the crankcase and the pcv system can't handle it.

that was one of the problems that caused me to decide to go back to n/a (i got tired of worrying about it all the time).

let us know if you find a fix.

 

i had my pcv off for about 10 minutes, the fumes were overwhelming so i designed a baffle to cover the bottom of the lower intake entirely and i put the pcv back in. i'm still running an open breather in the passenger side valve cover but i may just close that up and just run a hose from the filler neck to the powerpipe. that is the right way to plumb the pcv on a supercharged car.

 

My car was doing it real bad when the head gaskets were bad. After I changed the gaskets it went away now its back. No oil just pushing the stick out. I hope I didn't mess up another gasket. I actually put a small breather on the tube

Picture of were the gaskets were bad

 

I had the same problem. I ran a 3/8 hose from the PCV to a breather I borrowed from my harley and let it vent. I used 1/2" copper plumbing fittings in both valve covers and 5'8" heater core hose and used a T and connected them to another breather until I get a catch can. It has been working real well so far.

 

u guys that are wantin to run a vacumn from the supercharger is not good... yes it will pull vacumn but even wtih an oil air seperator the charger will still eat oil

 

put some moroso posi lock breathers in the valve covers, then run a hose into your exhuast with a check valve in between. Blow by should run out of the exhaust and the oil will just burn

Or do what i did, put the breathers in and vent into the atmosphere, the moroso ones are expensive but absolutely NO oil comes out with the baffling inside them.

 

but then wouldnt u blow blue smoke out ur exhaust?

 

I know for sure it's blowby. Before the blower was installed, I'd open the hood to find the dipstick pushed up about 3 inches. Now instead of just pushing it up, the extra blowby created by boost in the cylinders is causing the oil to come out.

I went ahead for now and put it back the way it was, with no PCV system. I spoke to Eddie over at Racer Walsh in Jax FL, and he told me the way to do it is run a hose from the PCV hole to a T, run a hose from the oil filler tube to the T, then from the T to a seperator device, then to the power pipe with a welded bung/fitting. He said it will pull insame amounts of vacuum and at higher RPMs will actually free up some HP because there will be a vacuum in the crank case.

I'm gonna use a water seperator for a compressor for now, but he said after about 5 WOT blasts it will be full of oil. I need to figure out something bigger. Any suggestions on a really good seperator?

 

with what you are planning, I would be afraid that the oil vapor you will be sucking through the supercharger would cause detonation. You defenitely do not want any oil going through the head unit. Sounds like you have a serious blow by problem that is gonna need to be fixed.

A seperator will seperate the oil from the air, but you will still have oil vapors that can cause detonation.

On my car, I never experienced the dip stick popping out, oil shoting out, pcv valve poping out or anything like that at 11PSI. I have the stock PCV system in place, and a line running from the valve cover filler to the inlet of the supercharger. BUT, I do exp. some detonation like this, and I believe it is from the oil vapor. This is why I don't have my blower belt on at this time.

I have found a very promising solution, that I will try and install in the next 2 -3 weeks or so.
PN: VW431-819-809A , $19.46
It is a heater valve for an 80's volkswagon fox, that is closed when vaccum is applied, and open at no vaccum or boost pressure. 1/2" in diameter
I plan to keep the stock PCV setup & line from the valve cover to the supercharger inlet.... but install a 1 way check valve in this line so that it will only allow air into the valve cover and not allow air from the crankcase into the blower inlet under boost OR WOT.
Also install a T fitting before the check valve and route the other end of that hose to the VW valve. And from the VW valve it will run down to the ground or into the exhaust .... I havn't decided yet, but either way will work.

This setup should open the VW valve under boost, allowing the crankcase to vent through it and into the atmosphere or exhaust.
And this valve will remain shut while there is a vacuum present so it will not let any unmetered air into the system.

If one isn't enough then I will install 2, one on each valve cover. It would prob still be a good idea to use a seperator before the VW valve just to prevent alot of oil from being introduced into the exhaust or down on the ground,

I will try and get a pic of this valve up in my gallery.

 

heres what what you guys do with a blower and blowby.

1) delete the stock pcv system. you really should do this since you be pushing boost into the crankcase elevating this issue. plug all lines out of the engine.

2) run two valve cover breathers, that have a hose attachment on them, run each of the lines from them to a catch can with a breather on top of it, this way any engine oil blowing out the breathers will drain back into engine, make sure it is slightly higher than valve cover, inside fender well works. i did it before on my first 5.0

 

You still need some sort of vacume to draw the air OUT, even with push in breathers the crankcase can get pressurized.

 

 

i totally agree with spydermandb

 

Hybred, what you are talking about will not work. You MUST evacuate the crankcase, especially under boost! It makes perfect sense to me. I have a VERY safe tune so I doubt detonation will be an issue. The guy at Racer Walsh says they've built many forced induction cars using that method and haven't had any issues.

I'm gonna try it and if it causes detonation/blown head gasket I'm gonna pull the damn supercharger off my car and sell it to make way for a 351 based stroker. Boost is a PITA!

 

As long as the crankcase has an adequate way to ventilate itself under boost, you wont run into any of the problems you are having now. That does not mean it NEEDS a vacuum on it under boost. After you get out of boost and vacuum returns, the PCV will function like normal and evacuate they crankcase.

Breather filters on both valve covers work, but it leaves a mess and never completely evacuates the crank case, so those toxic gasses stay in there until the pressure builds up, causing sludge and such.

safe tune or not, oil or oil vapor in the combustion chamber can cause detonation.

 

Are you still running the stock '95 shortblock? It sounds like you have one or more cracked pistons (near the ring lands). Maybe cyls 7 and 8 ran lean/hot?

 

Here is how I did mine. Breather in the valve cover, one in the back of the lower intake. My dipstick pops out about a 1/4" under boost but it doesnt spray oil out. (Little blow by) There is no way a pvc would help that.

 

You might also want to pull out the wire mesh pvc filter in the lower intake that goes under the PVC. That might be clogged and causing your issues.

 

slowjunk50 howd u fab the breather in the lower???
i need to do that to mine

 

What I did was gut my PCV valve and attached a breather filter on it where the hose would go. The PCV valve is still in the grommet like normal, but has the breather on top of it.

I'm probably gonna build up a nice little 351 windsor here soon which means I can nip this issue right in the bud. Until then I'm gonna try to run the plumbing as I was told by Racer Walsh. I'm gonna call them tomarrow and ask about the oil issue with that setup and what kind of seperator they use.

I have a show engine and the oil all over everthing is a PITA! It just smears around when I try to wipe it off, any solvents that take oil off also tarnish the finish.