Yes, I am aware of that. I said it opens IMMEDIATELY when the throttle closes to continue to relieve pressure when the throttle is abruptly closed. Taking over for the vacuum that was the primary source when the air intake was the vacuum source. Crankcase pressure is still briefly evident when the throttle is abruptly closed so this is a secondary benefit to the PCV system.

-Jamie

 

03whiteGSR is right. Tom isn't using the PCV can for any sort of crankcase ventilation. Only to trap any oil that would normally find its way into the intake manifold under normal driving conditions with intake manifold vacuum. Unless I missed something.

-Jamie

 

couple of wrong here. 1. there is no water build up. there is condensation at start up that quickly boils off. if valve cover is vented VTA or sealed that water has a path to get out. chocolate oil kills your engine in short time. 2. 4g63 doesnt have fresh air entering crankcase. it only has combustion passing rings that needs to get out. its always a one way street. crankcase pressurizing by combustion. that pressure escapes through valve cover vents.

you guys are making this far more complicated than it is. the factory uses two vents on the valve cover. stock the pcv does half the work at cruise. the vent does all the work during boost. if you make the vent more efficient it eliminates the need for the pcv line to even be there at all. stock, both lines recirculate the gas and keep the smog guys happy. but both are very restricted. its easy to make one vent that flows better than the two combined. retaining the pcv is just bad because its the most direct path to get oil right into the chamber.

 

Actually, the PCV system generates enough suction during idle to pull fresh air in through the vent line that attaches to the intake pipe. Even with my drop-in build, if I put a piece of paper up to the vent nipple, the paper will suck up to it. The net flow into the motor from the vent line is not immediately obvious though because there is a pressure pulsation from either the combustion process or the motor rotatation. Not sure which.

 

i thought i explained it well enough.

the catch can in between the intake manifold and the pcv is stopping oil from entering the intake manifold, while still having the ability to function like stock by pushing the air traveling towards the intake manifold into it.

go see for yourself. the pcv helps with part throttle and driveability. your crankcase system will see spikes of positive pressure part throttle without the resistance there creating vacuum.

and that can is the most important one on my car.

that can has nothing to do with relieving crankcase pressure though. it is there as i said to stop oil from entering the intake manifold. and you can see how it caught that oil in it.

the can inbetween the intake pipe off the turbo does nothing. i agree. it just links the two together. I was under the impression i would see some oil possibly out of that side so i went with a dual style can system. well no oil not even a drop comes out of that side even with 5/8" drilled hole.

that side is whats donig all the crankcase relief in my system. the pcv to intake mani side is not doing anything in that regard.

on a evo 8/9 that is all you need to do even on a 8 second car to relieve all crankcase issues. drill out the valve cover to 5/8 and you are done. never ever drill anywhere else in the valve cover or you will push oil because of the way the baffling is setup inside.

 

SO after reading all that should i have a PCV valve in place or continue to run without one? LOL

 

based on what you said, you have no check valves, so your can must be directly connected to the valve cover rear.

just block off the port we talked about and see if your system performs as it should now without filling the can.

 

can you do a test and get logs of the difference with and without the pcv to show the pressure spikes that occur on part throttle and taking off and so forth?

i think that will surprise a lot of people what that extra vacuum really does for the car in terms of how the system functions altogether.

 

correct. no check valves or PCV. the rear can i can not monitor. it drains back in threw the dipstick. its the side catch can that fills up off the side of the VC. i am going to cap off the one side line and see what happens. i just didnt know if i should have a PCV valve on the car. i would assume if the oil is being bushed to the back of the VC that there most be oil going into the rear can ''threw the PCV line'' as well.

 

to me routing that side back into the engine seems like a bad idea. fuel mixes with oil quite often with e85 due to how e85 makes the cyl walls slippery vs regular gasoline, so e85 cars are more prone to blowby in that regard.

but if you do oil changes as frequent as i do then it probably doesn't even matter. and i am pretty sure you do, because you are just as picky as me when it comes to cars if not worse.

ya your side fills up because of the rear corner we spoke about. i bet as soon as you cap it and do a pull your problem will be resolved and you will be very happy.

JID on here originally told me not to do that. he said he wished he hadn't done it on his road course evo, because it really fills the can up quick since the baffling is non existent on that side vs the original outlet from the factory.

i personally don't trust stock pcv, i run the cheap check valve i linked with it and it is extremely strong. i pressure tested one up to over 150psi and it held up so those are underrated. plus trying to crush one with a sledge hammer shows you how well they are made. it is practically indestructible.

 

yea i am a bit retarded when it comes to fluid changes. engine oil, trans, TC, and rear get changed every time i go to the track or every 500 miles. which ever happens 1st. 98% of the time my fluids, plugs and filters see no more then 100 miles. the fluid comes out like it went in haha. but it makes me feel good.

thanks a lot for your time. i will report back once i get the car back together and can give this a shot.

 

Like I've mentioned before, I have the same setup as Tom, just no PCV valve...I run the 2 check valves only on my mild stock block setup. The front can gets nothing in it. The rear can gets 1/2-2/3 full every oil change, (3k miles or less). No driveability issues at all with no PVC, car feels smoother actually.

 

While I don't have the exact log you are interested in, I am certain that at least for my motor, if I were to block off the PCV line, there would be no pressure spikes of anything more than maybe 0.2 psi during cruise in vacuum. If you look at the WOT log that I posted earlier, the crankcase pressure doesn't reach 0.5 psi until 20 psi of boost.

I suppose I could get the log if you want, but it might be a day or two.

 

ok you're worse then i am. i do the oil every 500, but the trans and tcase no lol. (those every 3k).

no problem at all. and sounds good!

no pcv but the check valve you have are doing the same thing as the pcv though lol. you have one right after the valve cover right? if so then its doing the same thing as a pcv.

ya your setup is just like mine. one can is dry the other gets oil from stopping it from entering the intake mani. we have improved stock setups basically. and yes absolutely i noticed improved drivability and power gains right after the swap.


ok. i'd be interested in seeing the difference in vacuum between the two. doesn't have to be anytime soon. don't make it a inconvenience.

 

Hmm, has anyone thought of running the bottom drain of the catch cans back into the exhaust so the left over oil can be burnt instead of drained every few hundred miles. Should be able to do it with ss line right?