PCV/breather/oil seperator?
Got a 383 with a single plain and a turbo. What do I need as far as crankcase ventilation?
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Re: PCV/breather/oil seperator?
Grab a catcan with two port (each valvecover can vent to it)
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Re: PCV/breather/oil seperator?
Do I need some sort of vacuum to pull air through the valve covers? What about a RX Performance Stage II PCV catch can. Its meant for boosted applications. Right now I've got enclosed breathers with a port to hook up a hose in the valve covers right now, but I don't have them hooked up to anything, just open to atmosphere. I'm putting new valve covers on and don't want to drill any unnecessary holes.
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Re: PCV/breather/oil seperator?
Does the intake have provisions for a PCV valve already?
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Re: PCV/breather/oil seperator?
Originally Posted by 97WS6SCharged
(Post 6890955)
Does the intake have provisions for a PCV valve already?
Right now I have this, which has a spongy filter media in it. http://www.mattsclassicbowties.com/c...ems108-80p.gif Should I keep these and just run hoses to the catch can, or is there something better? |
Re: PCV/breather/oil seperator?
Positive crankcase pressure means pressure in the crankcase is higher than outside the crankcase (atmosphere)... which I am sure you know. If you run the lines from the valve covers to a 2 port catchcan (and the catchcan has a filter on it), then you should be fine.
If you want to be extra diligent, then buy an unvented catcan (3 ports) where the 3rd port has a line that runs to the cold side piping before the turbo. The sucking of the compressor will help draw from the catchcan... thus pulling from the crankcase. |
Re: PCV/breather/oil seperator?
Originally Posted by RealQuick
(Post 6891002)
If you want to be extra diligent, then buy an unvented catcan (3 ports) where the 3rd port has a line that runs to the cold side piping before the turbo. The sucking of the compressor will help draw from the catchcan... thus pulling from the crankcase.
http://www.andersonperformance.net/L...l%20FI_PCV.jpg |
Re: PCV/breather/oil seperator?
I have tried them all. I now run a crank driven vac pump. Also a centrifugal air receiver with an oil return circuit for vane lube. Super or turbo chaging usually results in to much ring blow-by. I pull a 1/3 athmosphere (about 5 psi vac) which seals the rings due to the ring pac pressure differential. I run this system in the street. I just converted to a single plane myself (World products motown w/ 4150 flange).
App... 97ss 383 D1 ATI with MM6 trans. B. |
Re: PCV/breather/oil seperator?
Should I run a breather on one valve cover and a PCV breather on the other? This is what some people suggest. I was planning on running 2 of the PCV breathers with the nipples and having a catch can inline with a vacuum source sucking out the two valve covers, but I see that some people suggest I open breather and one PCV breather. Why is that?
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Re: PCV/breather/oil seperator?
Originally Posted by LT1 POWR
(Post 6891021)
I'm a little confused on the routing of the tubing.
Dirty air is pulled out of the valley cover (PCV port on the LT1) and into the dirty can. This is where you should find any oil residue. The dirty air is either drawn into the intake manifold (front port on the LT1) directly or into the turbo/blower inlet during boost (the check valve should close to prevent pressurizing the dirty can). You could techincally eliminate the clean can from the system to save money and reduce complexity by just running filters on the valve covers but you will probably find a little bit of oil on your valve covers from time to time. http://inlinethumb40.webshots.com/50...500x500Q85.jpg |
Re: PCV/breather/oil seperator?
Originally Posted by LT1 POWR
(Post 6890960)
No provisions for anything. Should I run a vacuum line from the catch can to somewhere near the air filter so it pulls the crankcase vapor out?
Right now I have this, which has a spongy filter media in it. Should I keep these and just run hoses to the catch can, or is there something better? http://inlinethumb31.webshots.com/15...500x500Q85.jpg I wouldn't run the spongy thing personally. Just one more thing to get dirty and possibly cause problems later. Make sure you get a 3 port can with an internal mesh. :) |
Re: PCV/breather/oil seperator?
I have nowhere to hook up a line from the valley/intake since I'm using a single plane. So I was going to do a 2 port can. One line coming from the drivers side valve cover and the other to the pre turbo tubing for vacuum. I'll have a breather mounted in the passenger side valve cover. I know this isn't ideal, but it should work decent.
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Re: PCV/breather/oil seperator?
Originally Posted by LT1 POWR
(Post 6892326)
I have nowhere to hook up a line from the valley/intake since I'm using a single plane. So I was going to do a 2 port can. One line coming from the drivers side valve cover and the other to the pre turbo tubing for vacuum. I'll have a breather mounted in the passenger side valve cover. I know this isn't ideal, but it should work decent.
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Re: PCV/breather/oil seperator?
Originally Posted by 97WS6SCharged
(Post 6892413)
You don't have any 3/8" vacuum ports on the intake? It will still work as you described with a 2 port can but I don't know how much vacuum the turbo will pull.
I figured the suck side of the turbo will always have some vacuum whereas the intake will pretty much only make vacuum at idle, very light throttle and deceleration. |
Re: PCV/breather/oil seperator?
The turbo is going to pull air from the most free flowing spot possible which should be the filter so I wouldn't expect much vacuum from that.
Are you running an elbow on top of the single plain? If so you could always tap that behind the throttle body for an additional vacuum port. |
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