what is this for ?

[mirkoelek]

http://www.dsmtuners.com/gallery/showimage.php?i=66865&catid=newimages

This is maybe a newbie question, but what is this big nipple on the right side of the head cover.
It goes to the intake, it could be a massive boost leak if you aske me....

 

[alex99gst]

http://www.dsmtuners.com/gallery/showimage.php?i=66865&catid=newimages

This is maybe a newbie question, but what is this big on the right side of the head cover.
It goes to the intake, it could be a massive boost leak if you aske me....

I think you are talking about the PCV valve (positive case ventilation valve). It is a check valve that allows vacuum in the case, but as soon as it feels pressure the valve closes. It keeps the case under vacuum.

 

[mirkoelek]

I think you are talking about the PCV valve (positive case ventilation valve). It is a check valve that allows vacuum in the case, but as soon as it feels pressure the valve closes. It keeps the case under vacuum.

i blow thu it and it wouldnt close. I believe there is the ball inside...

why is the vaccum important there

 

[staticbrainwash]

Yeah, PVC or just the intake recirc. for crank blowthru. Take the pvc and blow through both ends (if you have it off) one way should close, the other shouldn't. If neither closes you need a new pvc. The other one goes back to your intake pipe and can be safely re-routed to either a catch can or with a small breather (intake looking filter but very small). The catch cans can be made or bought, and the breather can be had for 10 bucks-ish at autozone or a similar car parts store.

 

[alex99gst]

You should be able to blow through one end and not the other. I thought mine was bad so I went to autozone and got a brand new one and it leaked air 3x as bad. Somehow by messing around with mine it worked again. Most people prefer OEM pcv valves to the generic ones and I can vouch that the generic ones suck The valve is there to relieve case pressure that builds up. With less stress from pressure on everything, you are increasing its life time.

 

[mirkoelek]

Yeah, PVC or just the intake recirc. for crank blowthru. Take the pvc and blow through both ends (if you have it off) one way should close, the other shouldn't. If neither closes you need a new pvc. The other one goes back to your intake pipe and can be safely re-routed to either a catch can or with a small breather (intake looking filter but very small). The catch cans can be made or bought, and the breather can be had for 10 bucks-ish at autozone or a similar car parts store.

I believe mine is bad. It used to make a rattling sound

 

[alex99gst]

Yeah, PVC or just the intake recirc. for blowthru. Take the pvc and blow through both ends (if you have it off) one way should close, the other shouldn't. If neither closes you need a new pvc. The other one goes back to your intake pipe and can be safely re-routed to either a catch can or with a small breather (intake looking filter but very small). The catch cans can be made or bought, and the breather can be had for 10 bucks-ish at autozone or a similar car parts store.

If you choose to do the catch can, you also will need to hollow out the pcv valve or install a hollow threaded barb thing in its place or you could run into problems.

 

[mirkoelek]

If you choose to do the catch can, you also will need to hollow out the pcv valve or install a hollow threaded barb thing in its place or you could run into problems.

what are you taking about ?

 

[staticbrainwash]

Alex99gst, is it absolutely necessary to hollow or staright fit it? It should function just the same on a stock pvc (legistically i mean).

 

[mirkoelek]

You should be able to blow through one end and not the other. I thought mine was bad so I went to autozone and got a brand new one and it leaked air 3x as bad. Somehow by messing around with mine it worked again. Most people prefer OEM pcv valves to the generic ones and I can vouch that the generic ones suck The valve is there to relieve case pressure that builds up. With less stress from pressure on everything, you are increasing its life time.

that doesnt make sence to me. On the idle your car shouldnt have much pressure...and there is other valve that would take care of it if there is any. I dont think there is much pressure under the cover.. what happens than when boost hits under WOT. The
only thing that i would think of is , it could be that thing is trying to pull and help oil to get easier to the head or something like that ...

 

[jott5555]

recently a good friend of mine and myself noticed that we were getting a lot of oil sucked through the pcv valve into the intake mani.. quite a bit.. so i blocked it off.. and blocked off the breather in the front of the valve cover i drilled and tapped two 3/8th fitting's with stainless line going to a catch can w/ a breather.. inside the valve cover i put two baffle's to cover the opening's so oil dosent go into the line's buy they have plently of ventilation..

basically lots of work for little gain.. but it stopped oil around my injector's WOOT!!

 

[mirkoelek]

recently a good friend of mine and myself noticed that we were getting a lot of oil sucked through the pcv valve into the intake mani.. quite a bit.. so i blocked it off.. and blocked off the breather in the front of the valve cover i drilled and tapped two 3/8th fitting's with stainless line going to a catch can w/ a breather.. inside the valve cover i put two baffle's to cover the opening's so oil dosent go into the line's buy they have plently of ventilation..

basically lots of work for little gain.. but it stopped oil around my injector's WOOT!!

is there any there any other gain other than no oil going into your intake manifold

 

[staticbrainwash]

No oil should be the major concern. It kills efficency, hinders flow, and makes your car poop smoke if it's bad enough. (bad pvc's sometimes cause smoke)

 

[madman]

what is this for ?

--------------------------------------------------------------------------------

http://www.dsmtuners.com/gallery/sho...atid=newimages

This is maybe a newbie question, but what is this big nipple on the right side of the head cover.
It goes to the intake, it could be a massive boost leak if you aske me....

Blowby gasses are gasses that don't get burnt off and they will create pressure in the valve cover. The PCV valve releases that pressure/gasses into the intake manifold. Since there is vaccum pressue in the intake mani, they made the PCV with a check valve in it, to help equalize the vaccum presure to allow the exchange of gasses. The valve opens and closes with the vaccum pressure. Any excess gasses that can't release through the PCV valve under extreme high load (WOT) will escape through the breather valve, that is on the passender side of the valve cover that routes back into the turbo intake pipe.

People use catch cans to collect the oily blowby and keep them from getting back into the motor.


Read this. It's about using a catch can and the PCV valve. It's kind of lengthy but It covers every aspect and option of the whole issue.

http://www.dsmtuners.com/forums/showthread.php?t=209438

I talked about the PCV valve in post #54 which came from this site:
http://www.autoshop101.com/forms/h63.pdf

This link will show you the catch can with a filter.
http://www.roadraceengineering.com/eclintake.htm

This linke shows the Greddy catch can.
http://www.roadraceengineering.com/instructions/greddycatchcan.htm

Hope this helps.