Blocking Off PCV
- Thread starter ATISTANG
- Start date
I machined an aluminum plug and pressed it into the back of the intake. Careful running breathers in the VC though, they WILL fall out under hard acceleration and can cause a fire if you dont catch the problem.
The right way to do it is to run -AN fittings off the valvecover to a breather tank. NA you can get away with one fitting but boosted you are going to need a -12an fitting on each valve cover
The right way to do it is to run -AN fittings off the valvecover to a breather tank. NA you can get away with one fitting but boosted you are going to need a -12an fitting on each valve cover
I have trick flow valve covers with the filler neck they provide with it, i'm going to put a breaker in place of the cap, then i was gonna do the same on the opposite side
how would i attach an an fitting to the valve cover? i don't have much room for anything hanging down from the valve cover without hitting the rockers.
also i thought someone sold plugs for the pcv port?
my valve keeps popping out of the intake, so thats not gonna helpI just capped the tube
KamiKaziDK
Member
blackened88lx
Active Member
It will not go into the valve cover at all. Just buy the fittings, figure out what would be the most convenient place to mount them on your valve covers, mark, and drill a hole. Bring them to someone with a tig welder and have the fittings welded onto the valve covers. Then run some hose to a catch can with a breather on it. Oh, and obviously do the drilling and welding with the valve covers off the car...
Or if you don't want to weld on your valve covers and have to repaint them, you might be able to try drilling and tapping them and threading the fittings in with some sealant for a cleaner look.
This is a picture of the setup.
what size? and did you just drive it in, or did you use some rtv around it or anything?
I think I'm gonna go with the breather in the end of the filler neck, i know a guy going this route and doesn't have any problems. Right now all it has to breath through is a 1/4 inch pipe fitting with a hose on it, until it pops the pcv valve out that is lol.
if that doesn't work then i'll already have a hole in each valve cover so i can go with the AN fitting and catch can setup
95Vert383AOD
15 Year Member
Why do this? Don't we want the pressure relieved? Problems like Valve cover gaskets or intake oil valley gaskets losing seal and losing oil can will happen. What is the benefit to this MOD other than Gases & Temp. buildup? I toss this mod in the box along with removing the vacuum line off your fuel pressure regulator. But thats just me....
I run 1 PCV and 2 breathers (one on each valve cover) piped to the intake before the TB.
Venting the Crank case up threw the push rod holes of the head and threw the valve cover isn't the most efficient way of doing this. I'm pretty sure your crankcase temps will increase threw this "MOD"
With that said i have had oil control issues using a PCV if you do and this is a reason for your mod then your problem lies elsewhere. I have ZERO oil being sucked into my intake...a PCV will not hinder performance.
I run 1 PCV and 2 breathers (one on each valve cover) piped to the intake before the TB.
Venting the Crank case up threw the push rod holes of the head and threw the valve cover isn't the most efficient way of doing this. I'm pretty sure your crankcase temps will increase threw this "MOD"
With that said i have had oil control issues using a PCV if you do and this is a reason for your mod then your problem lies elsewhere. I have ZERO oil being sucked into my intake...a PCV will not hinder performance.
I think it will be fine, i have seen many renegade cars set up this way
i'm not sucking any oil as with boost i don't want to plum the pcv to the TB, under hard accel it will pump boost into the crank case and or just slam the pcv shut
blackened88lx
Active Member
My buddy ran that setup for a little while with the breather in the filler neck. It was ok but it blew oil all over the engine bay every time he beat on it. Then we just came up with the hose setup.
Nah, it works mint. Boosted cars blow the pcv valve out of the intake because it doesn't vent well enough. This setup has and will fix all problems. There's a reason everyone with a real blower/turbo car runs this or a similar setup.
kendoo130
Founding Member
I did this also-I put a small K&N breather on there. I also run valve cover breathers.
95Vert383AOD
15 Year Member
OOOOOh now i understand. Thanks just never knew why folks set it up this way. I noticed my friends 98 Lincoln mark viii doesn't have a PCV on the crank case. It has one on each valve cover.
If you are running breathers AND a pcv.... then you have created a vac leak via the breathers....
I'm sure it runs, but it isn't ideal.
2 General rules -
1. The more breathers the better, which is why I suggested installing a breather on the pcv port of the lower intake... INSTEAD of plugging/capping the hole off. (Obviously there is a point of diminishing return: 10 breathers probably won't gain much over 3 breathers)
2. Breathers and pcv's don't mix.
67coupe
Founding Member
I did this yesterday in an effort to reduce oil consumption. I used this from Autozone:
Spectre 3/4" i.d. push in breather. Part# 4300
It fit directly into the pcv port. Just be sure to plug the hole at the TB and the vacuum fitting on the manifold for the PCV valve. For me, it completely eliminated the cloud of blue smoke after periods of long idle.
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