Breather for PCV Valve?

LCPLPunk · Post by **LCPLPunk** » Wed Oct 19, 2005 7:53 pm

I'm wondering if anyone has put a air filter/breather on their PCV valve?

I noticed that Roach has and i'm wondering if that's alright to have...

http://www.roachracing.net/

quicksilvr · Post by **quicksilvr** » Thu Oct 20, 2005 2:32 am

I have one on mine. It's just an standard little deal that I got at Advanced Auto. Works great and I don't have to mess with a line running to my intake, or getting oil in the intake. Oil doesn't seem to be an issue with my car though, because that breather filter is dry as a bone, and there is no sign of oil vaporizing between the head and the firewall.

LCPLPunk · Post by **LCPLPunk** » Thu Oct 20, 2005 9:09 am

hmm...i'm gonna wait to see what more people have done before i do this.

nodestiny · Post by **nodestiny** » Thu Oct 20, 2005 9:21 am

i think its LEGAL to have a breather on the top portion (replacing the sponge) but not emmissionable to replace the other (going from valve cover to intake). If you are worried about oil, wal-mart has oil catch cans that can be made cheaply

ANYBODY know if there is an advantage of running your breather to a cooler spot? I recently moved mine into the fenderwell (just extended with a foot or two of tubing), figured it would bring in cooler air into the head.

CrashTeam · Post by **CrashTeam** » Thu Oct 20, 2005 1:41 pm

I ran a breather in my last car, It worked fine, That car puked oil though...

LCPLPunk · Post by **LCPLPunk** » Thu Oct 20, 2005 2:02 pm

so..it didn't work then..

CrashTeam · Post by **CrashTeam** » Thu Oct 20, 2005 2:43 pm

It worked fine, it just depends on if you engine pukes oil or not, some do some dont, My neon doesnt, I had the intake off the other day and had no oil in my tb or anything, clean as a whissle. It just depends... My last car was a daewoo though, so who freakin knows...

Post by **Diablo0** » Thu Oct 20, 2005 3:15 pm

CrashTeam wrote:It worked fine, it just depends on if you engine pukes oil or not, some do some dont, My neon doesnt, I had the intake off the other day and had no oil in my tb or anything, clean as a whissle. It just depends... My last car was a daewoo though, so who freakin knows...

Check the bottom of your Intake Manifold

. The PCV line runs down to the Intake Manifold so there wouldn't be any oil in the system before the Intake Mani (ie. TB, CAI, ect..). If you corner hard to the right a lot you'll blow oil out the PCV which leads down to the Intake Mani making a small puddle. Might not be a lot but it'll probably a little.

BlackRoseRacing · Post by **BlackRoseRacing** » Thu Oct 20, 2005 6:29 pm

you want to keep some type of evacuation going on... on a N/A motor run a seperator between the pcv and intake. It will help keep the oil from getting sucked in.
On a forced induction car, its even more detremental. With high boost or even nominal boost, there IS going to be blowby. Well obviously blowby causes loss of power and where is the blow by going to go?
You wan to create a negative pressure in the crank case, but not to much.. If you have to much you will suck your seals inward. You want to create a negative pressure to help seal the rings even better to try to prevent some of the blow by.
Its difficult to try to explain it but the best way to understand what im talking about is:
Remove the hose on the rear of your valve cover, start the motor...now reach in the back of the valve cover and plug the whole with your finger. Now wait a second or two. No do you hear the whistling going on? thats because you created to MUCH vaccum, and air is starting to get sucked in to the crankcase anywhere it can.
Now the trick is to try to balance that vaccuum to where it does not do that, but creates enough vaccuum to keep the crank case at a negative pressure without blowing things out...
The last time I tried this was on a car that ran WILD boost pressures. I had a breather on one end, and a one way check valve at the other and connected to the exhaust to create a 0 pressure atmoshere. It worked perfect, but other scenarios applied to my situation that is going to be different to yours....
weh...that was a lil long winded

nerox · Post by **nerox** » Tue Aug 30, 2011 2:35 pm

what would be the benefit of putting this breather on the PCV valve ?

Danteneon · Post by **Danteneon** » Tue Aug 30, 2011 2:40 pm

Wow, major thread rez

Putting a filter or a separator/catch can in the PCV line prevents oil from pooling in the intake manifold.

Diablo0 wrote:Check the bottom of your Intake Manifold . The PCV line runs down to the Intake Manifold so there wouldn't be any oil in the system before the Intake Mani (ie. TB, CAI, ect..). If you corner hard to the right a lot you'll blow oil out the PCV which leads down to the Intake Mani making a small puddle. Might not be a lot but it'll probably a little.

C1DoG · Post by **C1DoG** » Tue Aug 30, 2011 3:01 pm

Danteneon wrote:Wow, major thread rez

Putting a filter or a separator/catch can in the PCV line prevents oil from pooling in the intake manifold.

nerox · Post by **nerox** » Tue Aug 30, 2011 3:55 pm

call me stupid .. but dosen't the PCV vavle need vacuum, hence why its connected to the IM ?

Hudson_Neon · Post by **Hudson_Neon** » Tue Aug 30, 2011 4:06 pm

you are correct. there's a few things messed up on his site... like his 2006 srt.

nerox · Post by **nerox** » Tue Aug 30, 2011 4:43 pm

what about the breather just behind the oil filler, is it ok to put a little filter on there?

IIRC that runs down to the airbox and has a little sponge filter on it so i guess that not a vacuumed part, but what does that bit even do?

Hudson_Neon · Post by **Hudson_Neon** » Tue Aug 30, 2011 4:58 pm

that you can do. i'm running that now...

you can see it back there

nerox · Post by **nerox** » Tue Aug 30, 2011 5:00 pm

Hudson_Neon wrote:that you can do. i'm running that now...

you can see it back there

ah i like that, much neater than the huge black hose !

Hudson_Neon · Post by **Hudson_Neon** » Tue Aug 30, 2011 5:02 pm

my biggest thing is that it prevents the melting of that hose if it were to come in contact with any of the turbo componants

Danteneon · Post by **Danteneon** » Tue Aug 30, 2011 5:09 pm

I'm running one there as well. You can use one of the rubber elbows that is on the stock line along with a short piece of the plastic tube to mount the filter pointing up.

Prevents any oil from flowing out the VC and out the breather.