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Old 03-22-2011, 08:25 PM   #1
thefrog1394
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CCV out, vent to atmosphere/catch can, closed catch can system, or new CCV?

So I have my CCV torn out and I'm debating whether to reinstall, catch can, vent to atmos, etc. So far what I don't like about venting or a catch can which vents is that there is now air being vented to the atmosphere that the MAF doesn't know about. If the car thinks this air is there then there is the possibility of the computer not making the correct AFR assumptions.

Additionally, the crankcase will now be slightly positive/0 pressure instead of vacuum. The vacuum of the intake manifold is no longer there to pull condensation out of the crankcase. Also, I feel like vacuum in the crankcase would reduce the amount of work the seals have to do and eliminating this could cause oil leaks.

Any thoughts on whether this is just me talking out my ass or what?
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Old 03-22-2011, 08:43 PM   #2
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As to the technical aspects of your post, I cannot comment... but I do have a question.

What is the benefit of going with a vent-to-atmosphere or a catch can? Is there any benefit, and if so, is it worth the risk of confusing your engine's computer?
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Old 03-22-2011, 09:06 PM   #3
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Originally Posted by spage View Post
As to the technical aspects of your post, I cannot comment... but I do have a question.

What is the benefit of going with a vent-to-atmosphere or a catch can? Is there any benefit, and if so, is it worth the risk of confusing your engine's computer?
Fewer trees living near roads so we can see better around turns? There's a great benefit!

OP, I can't answer technically, but I can tell you that there are mechanical reasons why the ccv is there and environmental ones too. Mechanically, at the least, the oil you'd lose as vapor returns to the car. CCVs fail and not frequently, just seemingly because all of ours have at some point failed...or will. My vote is return the car to the way it was designed and you'll end up with a nice running bmw.
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Old 03-22-2011, 09:50 PM   #4
thefrog1394
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Originally Posted by spage View Post
As to the technical aspects of your post, I cannot comment... but I do have a question.

What is the benefit of going with a vent-to-atmosphere or a catch can? Is there any benefit, and if so, is it worth the risk of confusing your engine's computer?
No nasty oil in my intake, no worries about my CCV killing the engine, more power? (because the oil lowers the effective octane of the gas?) not sure if that one is true but I have heard it before.

Oh and I don't have to spend $150 on a system that hurts performance of my car.

On the environmental aspect, I am sure running without cats is way worse and people here do it all the time. Not saying its the best thing in the world but realistically, its not really different than running an older car.
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Old 03-22-2011, 10:04 PM   #5
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ccv dose not vent into intake it goes to the crank case only dosent it
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Old 03-22-2011, 10:14 PM   #6
thefrog1394
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ccv dose not vent into intake it goes to the crank case only dosent it
The oil/blowby gas mixture is sent to the CCV which separates the oil from the gas and sends the gas to the intake manifold and oil to the dipstick tube. There is also a valve on there that varies how much it opens based on engine vacuum.
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Old 03-22-2011, 10:15 PM   #7
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ccv dose not vent into intake it goes to the crank case only dosent it
It vents to the intake...

I believe a properly working CVV will only vent air though, and keep the oil where it belongs.

It is a PIA to change, I just did mine last weekend. I'd rather leave it in stock form though... the location it is in would make it very difficult to tweak any sort of aftermarket or DIY setup.
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