FORCED INDUCTION Turbos | Superchargers | Intercoolers | H2O/Meth Injection

Vented or vacuum catch can

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Old 01-28-2013, 08:53 AM
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McMaster-Carr has some nylon check valves that close at .33psi, pn 5492K14, but you will also need some barb to npt fittings for it.
Old 01-29-2013, 07:29 PM
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guys how would u run a catch can that is not vented? mine runs form driverside to can, thin to manifold. Been like this for a while and it works. My passenger side goes to TB. Noticed oil inside intake the other day from how i had this ran. How would i do this setup with forced induction? Passenger side to after turbo filter and just run a passenger side filter above oil cap?
Old 01-29-2013, 07:49 PM
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Yeah your right from what I understand. Just vent the pas valve cover some how with the vacuum line pre turbo.
Old 01-29-2013, 09:07 PM
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I don't think you need to vent the valve cover to the turbo inlet. You would if the fumes bother you, but the fumes would only come out in boost. If you run the valve cover to the turbo inlet you risk getting oil into the turbo, charge pipes, and MAF sensor. You could run another catch can in line, but catch cans don't stop everything.
Old 01-30-2013, 01:18 PM
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ok well how about this. just plug off passenger valve cover and run a breather oil cap? But the other side valve cover will not be vented. Would the oil cap breather be enough by it self?
Old 01-30-2013, 02:20 PM
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Originally Posted by brandon6.0
ok well how about this. just plug off passenger valve cover and run a breather oil cap? But the other side valve cover will not be vented. Would the oil cap breather be enough by it self?
This is my plan. Blowby from one bank will have no issue getting to the other bank.
Old 01-30-2013, 02:30 PM
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ok i will give it a try like this.
Old 01-30-2013, 05:21 PM
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Originally Posted by brandon6.0
ok well how about this. just plug off passenger valve cover and run a breather oil cap? But the other side valve cover will not be vented. Would the oil cap breather be enough by it self?
Just run the filters on the valve covers. Simple, cheap and effective..
Old 03-19-2014, 10:51 AM
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Originally Posted by black4.8
there are several ways to do it. you will want vacuum to be pulling fumes etc out of the crankcase even when not in boost. i use the driver side port to get my vacuum. here is basically what i have. sorry for the paint skills.
*Sorry for the grave digging*

On this setup are you just capping the rear passenger valve cover port? Would there be a benefit in running it into the can along with the driver's valve cover via a T-Fitting?

Also, follow up question. Is the check valve on the catch can filter neccesary in a speed density setup?

Last edited by Funkster; 03-19-2014 at 12:42 PM.
Old 03-19-2014, 07:19 PM
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Some of you guys are trying to re-invemt the wheel here. I have my passenger side valve cover capped off and a vented catch can on my driver side valve cover. I get no fumes in the cab, and I have had no oil collect in my catch can in the last 3000 miles. I'm in boost quite a bit. Venting just one side should be sufficient in most applications here
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