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Is this normal for a vented catch can system? Please see video...

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Old May 13, 2012 | 08:44 PM
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Default Is this normal for a vented catch can system? Please see video...

I was running this line back into my intake manifold. I decided to vent to the atmosphere instead and put a filter on the end of the hose. I have both the driver's side and passenger's side valve covers tee-ed together before it goes into the catch can and then out the small air filter in the video. I capped off the intake manifold and kept the catch can system separate. I am also getting "oil mist" around the area of this air filter and some drops of oil on my garage floor after parking the car. I have since ran this into another catch can to collect the oil but I may be considering just running this line into my downpipe so all of this just goes out my exhaust. My main question is the fumes and oil smell is pretty bad at stoplights (smoke coming out the cracks of my hood and my a/c blowing the smoke through my vents as it sucks this air into the cabin) and such the way it is in the vid, is that normal or does my smoking seem excessive? Thanks in advance.

Vid: http://www.youtube.com/watch?v=S1QSZ...1&feature=plcp

Last edited by 350Z400rwhp; May 13, 2012 at 08:48 PM.
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Old May 14, 2012 | 05:21 AM
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that does not look good at all, thats exactly what happened to alex gallardo at road atlanta when i was with him. im still a newbie so the only advice i can give you is to ask him for some help.
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Old May 14, 2012 | 08:05 AM
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yes, open filters will smoke a good bit.

the smell drawn into the car is why people tie the catch can into a vac source
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Old May 14, 2012 | 08:05 AM
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I'm not exactly sure what you should expect... but I've never seen a vented can smoking that much.

Last edited by djamps; May 14, 2012 at 08:43 AM.
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Old May 14, 2012 | 08:13 AM
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Doesn't look that bad to me.
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Old May 14, 2012 | 09:24 AM
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that is bad, also the way you described the hook up, you definetly do not know how the valve coveres breath. You should not vent the can, the can should be to manifold vac.

sequence

Air inlet > driver side cover > pass cover > catch can > manifold
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Old May 14, 2012 | 09:34 AM
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Originally Posted by MUZZY
that is bad, also the way you described the hook up, you definetly do not know how the valve coveres breath. You should not vent the can, the can should be to manifold vac.

sequence

Air inlet > driver side cover > pass cover > catch can > manifold
seriously?

don't listen to this. running open breathers vents just fine and used extensively on race cars with no issues. The only reason for a recirc system on cars is to eliminate the smell.
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Old May 14, 2012 | 10:29 AM
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Originally Posted by binder
seriously?

don't listen to this. running open breathers vents just fine and used extensively on race cars with no issues. The only reason for a recirc system on cars is to eliminate the smell.
u do know this is a boosted setup and he is venting the calves in parallel and not series.....

say what you want. Do what I said above, thank me later.
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Old May 14, 2012 | 11:00 AM
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Originally Posted by MUZZY
u do know this is a boosted setup and he is venting the calves in parallel and not series.....

say what you want. Do what I said above, thank me later.
You can run all the vent lines to a single catch can then run that open breather without issues. It does not have to be hooked up to a vac source. Quite a few people run them without any vac source. Vac source is gone under boost anyways so it only helps during vac (cruise) to remove the gases and smell.
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Old May 14, 2012 | 11:07 AM
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Originally Posted by binder
You can run all the vent lines to a single catch can then run that open breather without issues. It does not have to be hooked up to a vac source. Quite a few people run them without any vac source. Vac source is gone under boost anyways so it only helps during vac (cruise) to remove the gases and smell.
Why in the world would you ever allow oil vapors and oil smell into the car settling on your engine and needless to say oil drops on your garage floor when there is a simple fix to avoid it all?
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Old May 14, 2012 | 09:24 PM
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Originally Posted by MUZZY
that is bad, also the way you described the hook up, you definetly do not know how the valve coveres breath. You should not vent the can, the can should be to manifold vac.

sequence

Air inlet > driver side cover > pass cover > catch can > manifold
I had this setup but I was blowing boost into my catch can system and who knows but I was getting oil spraying out of this filter. I was considering a one way catch valve right off the manifold to only allow vacuum and close off under boost. I then decided to just cap off the manifold and keep things separate. After seeing the vapor and oil, I would rather not run that back into my motor anyway. I see the best option as just having a bung welded on my downpipe and run this all out my exhaust, problem solved. Thanks for all of the advice guys. The one thing I have learned over the years on this topic is there are many ways to do this and everyone will have their reason as to why one way may be better than another, the venting to the downpipe will be my method.
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Old May 15, 2012 | 02:23 AM
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^^^ I did that! Works great!!
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Old May 16, 2012 | 07:42 AM
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^ +1 if/when I need venting I'll definitely be running it to the exhaust. I have bad enough allergies/asthma as it is and is the main reason I still run cats.
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Old May 18, 2012 | 02:20 PM
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i would vent to my exhaust if it wasn't such a long way back to the post turbo exhaust. Too long for me to mess with running a hose. It would have to be 3/4" to keep resistance down as well due to the long length.

open breather keeps my crank pressure down and that's all i care about at this point.
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