vaccume line of the intake

[Mobius1]

How important is it for the vac line off the intake to be hooked up? The new intake I have doesn't have a spot to hook this up with. So now I wondering should I mod the intake to have the vac line or should i just leave the line hanging there as is and everything will be all honky dory? I remember one time I forgot to hook it up but I don't remember the car ever having a problem.

[ricerrx7]

Very important. It's part of your PCV system and is there for emissions purposes, and also keeps dirt/dust out of your head.

[Mobius1]

ok so i guess i'm drilling a hole big enough to shove that stupid thing in then. wish there was a better way to do it since its basically there to keep the dirt out. I don't have any cats so emmissions isn't a big deal.

[KSpec5guy]

Put a shorty filter on it and call it good. 5 bucks from the FLAPS.

[KeWLKaT]

Yeah. Not really important. It just blows out vaporized oil, which is why you need a breather filter on it.

So just buy yourself a small breather filter and hook it up to the line, or even directly on the head of the engine where the valve is.

[Mobius1]

well i'll hav eto take pics of how ghetto my intake was. But what I did was cut more plastic off of the orig intake up to where the lil tube for the vac line was. The I put the new SRI tube on the end of that and then the filter. So now it just looks like a either a gynormiss sri or a mini CAI until i get the breather filter. funny thing is after I had typed the orig post i was like why didn't i just put a small filter on there...lol..oh well thanks a lot for the response and the tips in regaurds to this and for thoes who have suggested thigns for my remote turbo project.

[BColeman]

It's not a vaccuum line exactly.

It's the cylinder head relief line, as I like to call it. It returns excess air from the head back through the intake into the intake manifold.

THERE IS NO REASON YOU WOULD GET DIRT INTO THE HEAD. There isn't any suction into the head, it's blowing out. Just through a $9 breather filter on it from Autozone or whereever and you'll be just fine. Or, add a small "catch can" to the line and a filter on the other side. This way you won't be washing the filter every two weeks and you can see how much oil is being blown out.

[ricerrx7]

Umm, yes, it does suck into the head. It's part of the PCV system. The intake manifold sucks air through the PCV valve, which sucks excess pressure out of the crankcase (or in our case the top of the head) and the way it keeps the head from going under vacuum is to draw air in through that hose.

[DJ Hellfire]

You won't pass inspection with a breather filter on it, but it will work. Putting a breather filter on will raise your car's hydrocarbon output. So if you plan on trying to go through emissions inspection with it on, forget about it. But otherwise, it'll work. Or just drill a hole in the pipe and have a welder weld a little nipple on it. Should cost no more than $20.

[KSpec5guy]

Here we go....

[BColeman]

Now wait a minute, this isn't making any sense. I'm not trying to argue with anyone here, but let me ask you all something.

1) One of the mods we can add to the car is an OIL CATCH CAN for the hose running from the valve cover to the intake tube. This is to CATCH oil coming FROM the Valve cover (head) into the intake system. The purpose is to prevent oil being sucked BACK into the INTAKE MANIFOLD.

2) The other option is to add a breather filter, NOT so the system breathes through it, but so the oil coming FROM the head isn't sprayed everywhere on your engine.

It doesn't suck, at all. The only line that SUCKS IN is the one from the Intake Manifold to the Head, and that's your PCV system. The line we are talking about here is the RELIEF line from the valve cover to the intake, that prevents your head from PRESSURIZING.

[ricerrx7]

You're saying that the line from the intake manifold to the head blows pressure into the head? How is this possible when there is vacuum pulling from the head INTO the intake manifold? Now, when you go full throttle, the PCV closes and the pressure in the crankcase blows out the hose we're talking about. BUT other than full throttle situtations, that hose is sucking into the head.

[KeWLKaT]

Umm, yes, it does suck into the head. It's part of the PCV system. The intake manifold sucks air through the PCV valve, which sucks excess pressure out of the crankcase (or in our case the top of the head) and the way it keeps the head from going under vacuum is to draw air in through that hose.

Dude, that is NOT the PCV valve!!!

The PCV valve is the OTHER line on the LEFT side of the valve we're referring to!

[A&F 01 GLS]

k guys... lets get a lil diagram goin... so we can teach everyone what is what..... :)

[KeWLKaT]

ok, working on it.

Here:

http://www.elantraxd.com/forums/attachment.php?attachmentid=5393&stc=1

See? The othe liner that goes to the intake is NOT the valve. Frankly, I don't even know what it's called, we have always referred to it as ''the other valve''.

[ricerrx7]

Kewlat, do you honestly believe I don't know that? It's still part of the PCV system. Let's call it a breather tube. The IM sucks crankcase vapors through the pcv line, which sucks from the pcv valve, which sucks from the valve cover. If you constantly sucked through the pcv valve, and didn't have a way to bring fresh air in, you would create a vaccum in the crankcase. That is what the breather hose is for. To let fresh air into the crankcase.
So reread what I said and tell me where I'm wrong.

[KeWLKaT]

still, it isn't the pcv valve per say, which is the only thing i was trying to say.

also, it is still useless to me to hook it up to the intake.

[ricerrx7]

I never said that that line going to the intake tubing was the pcv valve, rather part of the pcv system.

[Mobius1]

oh how I love everyone on this site. Anywhoo, I was lazy and didn't feel like welding or drilling anything so I just did the easy thing and but I nice blue breather filter on there. As far as passing emmissions i'll never have to worry about that since Michigan is motor city and I don't foresee us ever going to emmissions testing for cars like cali or anything. If we did my car would be screwed since i'm not running any cats. I only called it a vac line simply becasue i'm still learnign this car since i've only had her for a year as opposed to my other three cars i've had. KewlKat I thought your lil diagram was pretty sweet and I thought I was the only person (besides the fiance) who liked Gunther. As i've said when I get the camara up and running i'll tkae before and after pics, you'll all have fun making fun of me for my ghetto intake system I had, thanks for the help and suggestions everyone.

[KeWLKaT]

KewlKat I thought your lil diagram was pretty sweet and I thought I was the only person (besides the fiance) who liked Gunther. As i've said when I get the camara up and running i'll tkae before and after pics, you'll all have fun making fun of me for my ghetto intake system I had, thanks for the help and suggestions everyone.

muahaha gunther owns :D :abovelol:

pics are a necessity!!! :D

[BColeman]

Sorry, still have to be argumentative.

You are talking about sucking in fresh air. What do you think the 1st line is for from the IM to the Head. That sucks in the FRESH air.

But like you said, where does the pressure get relieved from. That would be the second line, that's why I call it the "relief" valve. You seem to be missing what I've said. Why would we add an oil catch can to catch the oil if that 2nd line is sucking in? It doesn't make sense to add this if the line pulls in. And I've actually witnessed oil there in an oil catch can, as well as in my own intake pipe and TB, so this is a blow out tube. Check out Honda, DSM, you'll find the same thing there. And I would agree that it's part of the PCV system, cause like you said, where do you relieve the pressure. But it wouldn't make sense if both tubes were sucking in, there would be no where for the pressure to go.

Any way, our original poster already "fixed" his problem, so I guess this discussion is at it's end.

[ricerrx7]

The intake manifold is always under vaccum while the car is running. The crankcase has positive pressure, right? So how is the air going to go from the intake manifold INTO the head? That only happens when you go WOT. The PCV valve basically has three stages. Closed towards the head at idle, open at off idle/cruise, and closed towards the valve cover at WOT. So when you are at off idle/cruise the air is getting sucked from the head INTO the intake manifold, and you need to relieve the vaccum this creates in the crankcase, and that is what the other line is for. When you go WOT, the YES, the flow through that tube reverses direction and that is when you get the oil in your seperator.