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Crank case breather

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Old Nov 11, 2007 | 09:17 AM
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c900t16's Avatar
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Crank case breather

Where can i connect the crank case breather to? I have the oem hose still hagging on there but it's not connected to anything...i don;t want to put a filter on it either...it's a 350$ ticket along with the other couple laws ive broken and havent gotten around to fix yet.

i know it usually supposed to go the intake manifold pipe but i heard you can't do that with a boosted car since you dont want to send pressurized air back into yur head or crank case.

Where did you go conect it to?
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Old Nov 11, 2007 | 03:59 PM
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Here's a thought...a catch can?
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Old Nov 11, 2007 | 06:24 PM
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isnt it suppose to run to the intake side of the turbo, right after your filter?
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Old Nov 11, 2007 | 06:50 PM
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if your talking about the oil catch can you need the breather so it can suck the good stuff.
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Old Nov 11, 2007 | 08:01 PM
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Originally Posted by lancerrally45
isnt it suppose to run to the intake side of the turbo, right after your filter?

I was told that you can't stick it back on the intake side because if i get boost spike or something, it will send presurized air back into my crank case which is a big no no.

So is that true or not? If not, ill just stick it back on the intake by the hot side of the IC where the intake tube connects.

im not talking about an oil catch can either, not do i want/need one.

And i know how a regular non boosted PCV system works, and im not talking about that . The PCV valve on the crank case is being used for vacuum. Im talking about the other one on the side, the breather...lets out air.

It's only dissconected atm, because i had to remove it obv. from the original intake tube when i was doing the turbo.
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Old Nov 11, 2007 | 08:41 PM
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Your options

1. Route it back to the intake side before the turbo

2. Breather filter

3. Oil catch can

Now what are the issue with any of these.

Last edited by kungfugirl; Nov 11, 2007 at 11:58 PM.
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Old Nov 11, 2007 | 11:55 PM
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Originally Posted by c900t16
I was told that you can't stick it back on the intake side because if i get boost spike or something, it will send presurized air back into my crank case which is a big no no.

So is that true or not? If not, ill just stick it back on the intake by the hot side of the IC where the intake tube connects.
No - it's not true. Because the breather line connects to the 'low pressure' side of the turbo, where it's 'sucking' air in. It connects between the Air Filter and the Compressor. DO NOT connect it in between the turbo and intercooler (or between the intercooler and intake manifold) otherwise you WILL have the problem with a pressurized crankcase.


Originally Posted by c900t16
And i know how a regular non boosted PCV system works, and im not talking about that . The PCV valve on the crank case is being used for vacuum. Im talking about the other one on the side, the breather...lets out air.

It's only dissconected atm, because i had to remove it obv. from the original intake tube when i was doing the turbo.
The 'breather' on the side that you're talking about is actually meant to let air IN to the crank case. (that's why it's important for it to be 'behind' an air filter, because the PCV valve opens when there is a vacuum in the intake plenum - this SUCKS oily, fume-laden air out of the crankcase, and the breather lets in clean, filtered air to replace it)

The problem with 'boosted' engines is when the PCV valve is not 100% effective, and at high boost levels it can leak pressurized air into the crankcase. In this situation, the air comes 'out' of the breather instead. This can lead to oily residue in your intake, which is why most people use catch cans.
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