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When the PCV opens it will pull air out of the Valve cover. When you leave the vent tube open it can suck air through that and into the intake manifold, this will be unmetered air.
If you mean by where pcv used to hook up to then I have that plugged. so I don't see how in the hell so called unmetered air can getting into conbustion chamber. I could see getting into crankcase but not in the cylinder where unmetered air is not wanted.
pcv valve is off of valve cover which is has nothing to do with intake mani. someone care to explain to me? am I missing something?
Ok, so yours is plugged - good for you. I was talking about an OEM like setup.
PCV valve has a lot to do with the intake manifold considering it is hooked DIRECTLY to it, where else do you think the vacuum would come from?
Re-read my post again, it's really quite simple.
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As for the unmetered air, I will try again. If you leave the vent tube on the side of the valve cover open, whether with a filter clamped on it or have it running to a catch can or whatever unmetered air will get into the engine IF the PCV is still functional. This because under Vacuum the pcv is open and the engines vacuum PULLS air out of the crank case. Now if the breather port on the side is open to atmophere in one way or another air can be pulled into it, into the valve cover and right into the manifold. It couldn't be any simpler. Now is it a ton of air, no I highly doubt it. Was it a reason I said I didn't want a catch can? No, I already have a catch can installed.
Here are a few average DSM setups to help some of you understand since words are not enough sometimes.
This is a race setup, you will see most 1/4 only guys have this. I do not suggest it for street for a few reasons. I used to think it was the end all setup and nothing else was better but with some reading and having it on my car for over 1000 miles it's not that great for street use. Your engine bay will become and oily mess directly around the filter on the catch can, because of crank case pressure blowing out the filter at high rpm's. This air has tiny oil particles with it. Also your crank case will never get the condensation pulled out of it. So the oil will get watery in a sense. Also any smoke or blow by will just mix in with the oil as opposed to be possibly pulled out. Again, if you make huge power and need maximum crank case venting - sure this setup is ok. If you drive on the street alot and don't live at the track I don't see hy you need this setup. It has ZERO benefits other than clean IC pipes and max crank case venting. Clean IC pipes can be achived with sealed catch cans and filter. You only need tons of crank case venting if you make huge power or spend all your time at WOT like a Rally car for 20 minutes straight.
Stock setup, only flaw being dirty IC pipes. A filter will cure that if you keep it changed.
Your average street DSM setup. I do not like this setup. I've already mentioned why a few times.
Proper setup, in my opinion for a street DSM/4G63. After me personally beating the research horse to death and having the "race" setup on my car to which I don't like or need.
There are other options also these are just the most common setups you see in the DSM/GVR4 world.
Maybe/Hopefully this will clear it up for some of you.
