rodman

iTrader: (10)

After a bunch of searching I am still unclear about the whole PVC breather hose mods. Why does everyone connect the hose after a catch can back to the oem location such as the intake or manifold? Can't you just vent the hose from the catch can to atmosphere and plug the port on the intake? Why can't you remove the PVC valve and hose, then plug the port on the manifold and valve cover? Seems pointless to retain the PVC valve as it adds oil to your intake manifold wile running - vac and blocks out any case venting since it closes under boost. The only port one should leave on the valve cover is the breather, but do not reconnect it to the intake after a catch can since some oil vapor is still there.

Am I not understanding something? Becouse on my 4 Dsms this is the way I did it

EvoDan2004

iTrader: (94)

i caped off the part on the intake manifold and then ran a hose from the pcv to the ground. also if your talking about puting a catch can on. that go's from the side of the valve cover to a catch can to the intake pipe. there is no pcv there. so im not shore what your saying.

rodman

iTrader: (10)

Mmm, how do I say this...

The PVC valve and the hose(s) connected to it are removed. One end of the PVC hose is connected to the intake manifold so that hole left behind needs to be pluged, the other end is connected to the rear left hand side of the valve cover, this hole needs to be pluged also. Now you are left with the breather hose on the right front side of the valve cover. Run that hose to a catch can but do not connect the other end to the intake again. Instead cap off the hole left behind on the intake tube and just leave the other hose coming off the catch can to asmosphere.

EvoDan2004

iTrader: (94)

i dont understand. it makes no sence to me.

the pvc is on the back left side of the valve cover. i took the hose off the pvc going to the intake manifold and capped off the manifold. i then ran a longer hose from the pvc to the ground.

now for the one on the right side of the valve cover. from the valve cover i ran a hose to a catch can. then from the catch can to the intake pipe.

EvoDan2004

iTrader: (94)

n/m i understand now. i get what your saying.

hel_if_ino

iTrader: (2)

I am not really sure what you are saying also, but I will tell you this... do NOT cap off the hose on the right side(drivers side) of the valve cover, if you do so, the first time the PCV valve in the rear of the valve cover fails to perform (i.e. act like a check valve), you will pressurize the crankase enough to blow oil out of your dipstick location, and subsequently all over your engine bay... trust me, I found out the hard way.

EvoDan2004

iTrader: (94)

make this more detailed. thanks

hel_if_ino

iTrader: (2)

Haha, its pretty simple. Dont cap off the PCV lines, either or. I would suggest a catch can on the drivers side hose, if you are that concerned, or even a small K&N filter, which is what I had for a while, but switched back because it did absolutely nothing for me. Why are you messing with it anyways? Are you concerned about the oil in the intake tube? If so, then leave it alone, a little oil never hurt anything. The catch can is just bling for the engine compartment.

rodman

iTrader: (10)

So is it safe to do this mod, I just want to make sure I do not screw up my 35K car On a 2K DSM it's one thing, but on a new Evo it's another. I just could not figure out why people use the PVC valve cover hole for a 'breather' instead of just capping it off since it was never intended to be a 'breather hole'. I also could not understand why people were running the hose from the catch can back into the intake pipe instead of just capping off the intake and letting the hose from the catch can vent to atmosphere

Thought I was missing something.

Kerr

iTrader: (18)

Not meant to be a d!ck, but its PCV valve, Positive Crankcase Ventilation. PVC is plastic.

rodman

iTrader: (10)

No, no. I will cap off the PCV ends not the breather ends. The PCV system is pointless and only adds oil to your intake manifold, valves and piston heads. You would pass emmitions with or without it

EvoDan2004

iTrader: (94)

ok ok ok. lets start over here. are car's only has 1 pcv valve. it is located on the back left side on the valve cover. ( by the oil fill cap).

there is a hose running from the pvc valve to the intake manifold. i took that hose out. i capped off the nipple on the intake manifold and ran a longer hose from the pcv valve to the ground.


now there is another nipple coming out from the right SIDE of the valve cover. there is a hose from that nipple to the intake tube. i took off that hose and ran a longer hose from the valve cover to the catch can. then from the catch can back to the intake tube.

now in detail explane what your trying to say by useing this info.
good bad pros cons.

hel_if_ino

iTrader: (2)

Ah, I see what you are saying, use the catch can, but plug the return to the intake pipe. Yeah, I guess you could do that, not what it was intended for, but you would have to cap the hole in the intake tube... and put maybe a breather on the return from the catch can...

rodman

iTrader: (10)

My brain hurts, lol. Why did you run a hose from the PCV valve to the ground? Just cap the hole off. It was never meant to vent any air pressure (breather) anyway so why use it? Remember on boost this hole does not vent anything, it opens under vac sucking in all the hot oil vapor into your engine, YUCK.


Why re-connect to the intake tube? You are still getting some oil blow by into the intake. Just let that hose hang to atmosphere and cap off the intake tube hole.

You will not have any vac to this hose with the PCV disabled so a breather is not needed.

EvoDan2004

iTrader: (94)

??