You don't need the line running to the driver's side cover. Cap that off at the cover.

Also, isn't the top line of the catch can supposed to be the input side?

Also, why do you have that metal thing on the passenger side valve cover fresh air line?

 

So you are saying to CAP off the PCV valve hole in the drivers side valve cover??

No sure what metal thing your talking about on the passenger side valve cover. The only line hooked to the passenger side valve cover is pictured and runs into the side of the catch can. (Just above the oil fill cap in the picture)

 

cap line on valve cover and run just from intake. Also add a breather to lower back pressure!

 

There's no supply air going into the engine to replace the air you're taking out.

With the stock manifold and 78 mm thottle, there was a hose that hooked up the the throttle body for supply air. I'm guessing that when the FAST was put on, the throttle body was replaced with a 90 mm DBW GM one off an LS2, etc. That TB doesn't have an nipple on it. You need to run a line from the air intake to the valve cover, and on the LS2 it's run to the one on the pass side cover. It needs to take air from somewhere after the MAF, if you've still got one. If not, you could use a breather, but the can would not be a good place for it.

I would try to run it with the line I just talked about from the air intake to the valve cover along with lines from the valley cover to the can and from the can to the nipple on the intake manifold. I'd just cap off the rest, as it really doesn't do much but suck more oil.

 

here is a pic of my 700 rwhp c5 z06 with ls6!

the top line into the catch can comes from the lower pcv connection. The valley hose goes to the bottom of the catch can. plug the valve cover line as it's not needed and install a breather!

 

What about your drivers side line? (Where the PCV valve is stuck in the rear of the valve cover) Or is that the line you are saying goes to the Top of your catch can???

Do you have both nipples plugged on the passenger side valve cover??

Where did you get your breather for the oil cap??

 

Why are there 4 ports?

Lets go over the operation.

Fresh clean air enters the passenger side valve cover. On a C5 I think that line runs to the air filter Assembly.

Air flow works it's way though the motor then to the center valley cover.

From there it leaves the motor and goes to a catch can if you have one. Air leaves the catch can and travels to your vacuum source usually behind the throttle blade.

Now you can use a oil breather cap and cap the passenger side line. i would than route the air coming out of the valley cover to the top of your catch can. Than pick on of the side exists to a vacuum source. Plug all the extra ports on that catch can.

 

Im running a fast 92 with the ls2 90 mm dbw throttle body so I don't have the fresh air vent like the stock ls6 tb.

 

OK then cap off the passenger VC and get a breather, or find some other way to get filtered fresh air there.

And swap the lines on your catch can.

 

Alright. Thanks. As for plugging the drivers side would you just put a cap on the line and let the line hang??? Or is there a breather that you can fit in the driver side PCV location?

 

I removed the top of the catch can tonight and noticed that after the 90* elbow (Circled blue in the picture) there is canister on the under side that has a bunch of perforated holes in the bottom of it. Inside the perforated holes are two little filters. I will post a picture of what it looks like.

So with finding this wouldnt you want the top 90* elbow as the return to the intake??? (The way it was already hooked up??)

 

(The small filters inside)




The body of the catch can:

 

No, the filter is designed to give the oil something to cling to as it passes though. Then it drips to the bottom.

 

Okay. THANKS A Bunch!!

I plan on doing the $20. Oil cap breather mod tonight as well as rerouting the Catch can lines. I took a Qtip inside the line that went to the intake manifold and sure enough OIL!

ddawson how would you go about plugging the rear PCV in the Drivers side valve cover?? Or would you just hook it up to one of the side catch can ports as it was orginally

Heres a link to the DIY breather if anyone is interested:
http://www.ls1tech.com/forums/gener...ration-iii-external-engine/1230448-make-your-own-oil-cap-breather-20-guide.html

 

My driver's side valve cover just has a red rubber cover over that nipple. You can kinda see it in the back:

 

Correct, Mine was a black rubber plug that I had to remove for the Maggie install.

 

Remember, fresh in, difty out. If hooked up correctly, the catch cans vacuum source shoild pull from your catch can and into the intake to get the rest of the dirty air burnt off. Unless you have one of those bad ass cans that mistermike has, you will still see some oil gioing through just not as much.

 

Okay so just cap off the drivers side. Then run a breather on the passenger side valve cover, and hook the catch can up properly using only the valley cover port as a vacuum source connected to the intake. Finally cap off all unused ports on the catch can.

I now have a PCV deleted system with the only vacuum source as the Valley Cover / Intake

So the drivers side valve cover doesnt need a relief? Only the passenger side will have a breather which should be capable of breathing enough fresh air for the entire system?? Or would it be wise to put a small breather on the drivers side valve cover as well??

I know that some drag cars run a port from each valve cover to the collector on the header to evac the gases.

 

Okay so just cap off the drivers side. Then run a breather on the passenger side valve cover, and hook the catch can up properly using only the valley cover port as a vacuum source connected to the intake. Finally cap off all unused ports on the catch can.

Yes. If your passenger valve cover has a nipple then you can connect it to the driver's side to help the pressure equalize, but I don't think it'll be an issue. The valley has openings and any pressure on the driver's side should be able to get out. You can see one of them inside the valley on the right here. There is another to the rear:

I now have a PCV deleted system with the only vacuum source as the Valley Cover / Intake

You still have PCV. The valve is inside the valley cover.

So the drivers side valve cover doesnt need a relief? Only the passenger side will have a breather which should be capable of breathing enough fresh air for the entire system?? Or would it be wise to put a small breather on the drivers side valve cover as well??

Not really necessary but you can if you want.

I know that some drag cars run a port from each valve cover to the collector on the header to evac the gases.

Unless you're running the horsedick cam, you probably have enough vacuum in the manifold for the crank ventilation.

 

Does anyone else have any pictures of there breather setups on their cars??

 

If you want, you can mount a breather on the pass side oil neck as your fresh air source. Connect a hose from the pass side valve cover to the drivers side port. Then from the valley cover to the catch can, and catch can to intake vacuum port. Cap off the fresh air source from the air intake tract. Now you have yiur fresh air source from your breather during normal pcv operation, and a vent during wot. And the air gets circulated to the drivers side port. Only down side is this air is now unmetered. Most people dont have problems but youll have to see.

 

my cam is only a 233/239XER .598 .603 113LSa

Ill just cap the drivers side valve cover then.

 

i plugged the elbow coming out of the passenger valve cover. i run the line from the valley into the top of the catch can. then the oil drips down into the filter and the bottom of the can. The bottom line goes back to the intake to exhaust fumes and burn off gases!

 

i plugged the elbow coming out of the passenger valve cover.

The crankcase needs to be able to suck in fresh, filtered air. Do you have a breather or anything?