How do I add 2nd PCV valve to drv valv cvr?

r.barn5.0 · Aug 19, 2006

Installed new heads and intake and I'm getting TONS of
oil sucked up thru the PCV system into the upper intake.

From what the PCV sticky says I think I need to add
another PCV valve to the driver side valve cover to help
vent the crank easier.

How do you do this? you need another PCV valve there too right?

PLEASE HELP..... stumped

and yes
filter screen is in place, lower intake baffle is in place
it's a BBK - SSI intake with AFR heads and full exhaust.

bobbys9350 · Aug 19, 2006

get rid of the pCV system and run dual valve cover breathers!

RYC CUKR · Aug 19, 2006

Keep the PCV system.

A passive system, just breathers no PCV, will just vent the crankcase and not do an adequate job of removing the the corrosive vapors and fumes from the crankcase.

To add a PCV valve to the drivers side VC I would get the same part # PCV valve that you already have in the back of the lower intake and a grommet that snugly fits the PCV. I would then measure both the ID and the OD of the grommet and depending on the size use a holesaw or drill bit to drill a hole in the drivers side VC. Make sure that it is in an area that the PCV valve will not interfere with the rockers. Insert the grommet and then the PCV valve into the grommet. Connect up the hoses and there you go.

The other thing that you might be able to do is add a catch can between the PCV and the intake.

r.barn5.0 · Aug 20, 2006

I put in an air/oil separator inline, but it will fill up after
just a few miles of driving.

PCV is sucking up some serious oil.

I did a compression check before head and intake install
and came out great, so I dont think I have ring blow by.

any other suggestions on how to install PCV valve?
I have 1.7 rockers so it's already tight fit inside my valve covers

Bad92GT · Aug 20, 2006

Im having the same exact problem as well.. this is physics and chemistry from high school put together.. to suck air takes less inverted air pressure than it does to suck up liquid.. so basically (in mine and my pas theory) you have to much vaccum and its obviously great enough to suck up oil.. i just took mine and down sized the line and attached it to a smaller fitting.. it cut the amount of vaccum in half but does not get rid of it totally.. it seems to work so far.. plus i have a catch can to catch some oil..

vristang · Aug 20, 2006

Bad92GT said:
Im having the same exact problem as well.. this is physics and chemistry from high school put together.. to suck air takes less inverted air pressure than it does to suck up liquid.. so basically (in mine and my pas theory) you have to much vaccum and its obviously great enough to suck up oil.. i just took mine and down sized the line and attached it to a smaller fitting.. it cut the amount of vaccum in half but does not get rid of it totally.. it seems to work so far.. plus i have a catch can to catch some oil..

Reducing the diameter of the line does not reduce the vac. It will still be whatever the intake vac is. Hose diameter does not affect the pressure differential.
Also, if we assume constant mass airflow, the smaller hose will increase the velocity of the crankcase flowing through the pcv. The opposite of what is desired.

The restrictor has worked for some. But it seems more appropriate for VERY mild problems.

jason

vristang · Aug 20, 2006

r.barn5.0 said:
I put in an air/oil separator inline, but it will fill up after
just a few miles of driving.

PCV is sucking up some serious oil.

I did a compression check before head and intake install
and came out great, so I dont think I have ring blow by.

any other suggestions on how to install PCV valve?
I have 1.7 rockers so it's already tight fit inside my valve covers

I had to install another set of valve covers.
I had some old "Mustang Powered by Ford" cover in the garage.

I also have a box intake, so my setup is a little different.

I think I have a picture posted somewhere, but can't find it now.

The easiest way to do this would be to use a valve cover which is already drilled.

jason

r.barn5.0 · Aug 20, 2006

I found your picture.
http://forums.stangnet.com/attachment.php?attachmentid=45083&d=1149575196

How did you attach that?
what is that metal cap that PCV grommet/valve is mounted in?

stihl-066 · Aug 20, 2006

Since we are on this topic should the PCV valve be hooked to the carb or the manifold.

vristang · Aug 20, 2006

r.barn5.0 said:
I found your picture.
http://forums.stangnet.com/attachment.php?attachmentid=45083&d=1149575196

How did you attach that?
what is that metal cap that PCV grommet/valve is mounted in?

I'm impressed

The metal cap is somthing I found in a parts store. It attaches to the top of the valve cover, and the pcv fits inside the metal cap. You should be able to find it in most parts stores.
However, because that metal cap is about 1.5" tall, it may not fit underneath the stock intake manifold, or most of the aftermarket long runner intakes.

The cap simply twists into the hole in the valve cover.

jason

How do I add 2nd PCV valve to drv valv cvr?

r.barn5.0

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