bluebullet

Ok I read a ton of posts on catchcan vs valve cover filter. how do most of the turbo kits deal with this issue, I know you don't want it venting back into the intake for instance the way that it does with a CAI setup. What do the "kits" do for this.

bluebullet

anyone?

psileepR

i dont know of any kits that deal with it. with my kit i just bypassed my pcv installed a catchcan and used the intake as a vacuum source. my crankcase is just open to the atmosphere.

bluebullet

Is there anything negative with having the crankcase open like you have

B_1_8_hatch

can you post a pic of what your talking about here? sorry..having a hard time figuring out what your saying. i think i know what your talking about, just want to make sure.

MiraiZ

FMAX addresses this...there is a nipple on the intake (before the turbo, and after the filter) like NA cars. i simply routed the blowby back to the intake with a silicon vacuum hose (10mm)...no problems....only draw back I can think of is getting a small bit of oil in the intake...

Dengar

but doesn't running all of that back into the intake increase the risk of detonation? I thought that the only "safe" way to have that go back into the intake was through a breather filter at least and catch can at best? i could be wrong though

MiraiZ

why would it increase the risk of detonation?...its just compressed air....

the only real risk is if you have excessive blowby and blowing a lot of oil into the intake...that can F up your turbo. To be safe you can use a catch can....but my blowby is so minimal that the setup discribed above is fine


Modified by MiraiZ at 1:56 PM 7/29/2003

B_1_8_hatch

are you guys talking about the small pipe that comes out from the valve cover that normally a hose would go to from the intake?

phiberoptik

yes...

from my experiences, a breather filter can actually hurt your engine as it will clog up quickly with oil. Two things Ive seen done are:
1. Obviously a catch can.
2. An inline filter that is connected between the valve cover and the intake thus allowing the air back into the intake but filtering it first.

meanteg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">FMAX addresses this...there is a nipple on the intake (before the turbo, and after the filter) like NA cars. i simply routed the blowby back to the intake with a silicon vacuum hose (10mm)...no problems....only draw back I can think of is getting a small bit of oil in the intake...</TD></TR></TABLE>

It's not good. your turbo is sucking oil, I had the exact same thing with my Greddy kit . Not good. Remove this hose and plug the hole in the intake piping. re-route the hose in a catchcan.

The reason they setup it that way is to pass emission tests.

sikcrx80

just so u all know..
i know u cant hook it back up to intake..
but u better hook it up as i didnt have it hooked up in my car and i got a big fine, i got a fine for $380. for having a filter hooked up.
just warnig u all

B_1_8_hatch

i have a little filter there right now...so should i not use that little breather filter?

hybridsol

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by meanteg &raquo;</TD></TR><TR><TD CLASS="quote">It's not good. your turbo is sucking oil </TD></TR></TABLE>

Wrong way. The filtered air (from inside the non-pressurized intake tube) is drawn into the block.

Like this:

Filtered air -&gt; valve cover -&gt;crankcase -&gt;oil seperator -&gt; PCV valve -&gt; intake manifold

Been done this way forever, even on boosted cars. Remember the PCV only goes ONE way... don't make this more confusing that it needs to be.

[edit] I can't speel

sporkcrx

edit: Oh, I see what you're saying. But I don't think it works that way. The hose from the valve cover uses the vacuum from the engine to pull out pressure from the crankcase, correct?

reignofchaos

Hey guys, i pulled my crankcase breather hose off when car is on and the breather hole is pushing air out, i can take a small MPEG and show you proof it's pushing air out and not sucking in.

spooned out

am i reading this right? You should not connect the hose from the valve cover to your intake? Whats the draw back from having a small breather on the valve cover?

B_1_8_hatch

which hose is being discussed here, the one that originally went to the intake piping
or the one that goes to the intake mani?

bluebullet

the one that goes to the intake piping, this thread is getting crazy, I'm just gonna get me a GReddy catch can.

Dengar

haha...i'm with him ^

LiLOtaku

Here's what I'll be doing with my setup.

Materials needed

Catch Can
Y type vacuum tee
some heater hose tubing(small diameter)
maybe a 1/8 npt barb fitting
Inline Fuel filter(optional)

Route one line from the valve cover and one line from your pcv valve(the one coming up in the middle of the intake manifold on a b-series motor) to each of the nipples on the y type vacuum tee.

Then Route the Y type vacuum to the inlet on your catch can. From the outlet of the catch can route it to the inlet side of your turbo's intake piping(this is where you might have to tap the barb fitting onto the intake pipe for the heater hose).

You can optionally use an inline fuel filter in between the outlet of the catch can and intake pipe for xtra filtering of the vapors if you wish.

Dont forget to plug up the fitting on the intake manifold where your pcv valve used to be connected too. I personally am going to use it for a vacuum source for my BOV.

By doing it this way your getting constant vacuum and keeping the system closed and filtering the detonation causing oil vapors out. You won't have to worry about the pcv valve closing under pressure in FI motors.

Bongnak

wohow man im getting confused again! theres two different things going on here right? 1 the hose that goes from the intake to the valve cover is called wat? 2: the line from the intake manifold that goes to the pcv valve and then into the block is called wat?

now, for # 1 you can just put a breather filter correct?

#2, this is where you put the catch can...right?


please clear this for me...all the other posts have mostly the same info with the same confusion.

LiLOtaku

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bongnak &raquo;</TD></TR><TR><TD CLASS="quote">wohow man im getting confused again! theres two different things going on here right? 1 the hose that goes from the intake to the valve cover is called wat? 2: the line from the intake manifold that goes to the pcv valve and then into the block is called wat?

now, for # 1 you can just put a breather filter correct?

#2, this is where you put the catch can...right?


please clear this for me...all the other posts have mostly the same info with the same confusion. </TD></TR></TABLE>

Don't make me drop kick you.....

j/k .

Just do what I said and you'll be fine. I have no idea how your getting confused.

MiraiZ

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">FMAX addresses this...there is a nipple on the intake (before the turbo, and after the filter) like NA cars. i simply routed the blowby back to the intake with a silicon vacuum hose (10mm)...no problems....only draw back I can think of is getting a small bit of oil in the intake...</TD></TR></TABLE> just like stock!

boost3d

The way my stock boosted car is setup is this: two hoses running off of the valve cover, one with a oneway check vavle to the intake. Another running down to the intake side of the turbo. This is OEM design and used on many factory boosted cars.