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Forced Induction Forum
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Old 04-22-2017, 09:29 AM   #1
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Join Date: May 2016
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My Ride: BMW e46 325ci
Crankcase Ventilation

I have a question in regards to deleting the PCV in E46 325ci 2001 that is modified with an Up mount turbocharger. I read through this forum and other forums that I can delete the PCV and install an oil catch tank instead. My question is what is the best connection method for the oil catch tank? Also, what is the best hose size of the tank to be used?

I searched a lot and found some who installed the can: one hose connected to the head cover as they claim that the oil vapors do pass through the seals all the way up and the other hose connected to the intake manifold. Others say that you can install a can with a breather that will vent to the atmosphere.

The reason for all of this is that I had a small amount of oil back flow from the turbo when under boost last week and I am afraid that there is something wrong with the ventilation. I am also considering the hose connections which I have to be small as I saw others wider than what I have. So far, the turbo seal is still fine since I didn't go in positive boost after that incident.

Any help in this regard would be greatly appreciated.

Thank you

Last edited by mn_600; 04-22-2017 at 03:00 PM.
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Old 04-22-2017, 03:44 PM   #2
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Sorry to waste all reader's time. I found the answer to my question. Deleting the PCV is correct and I did some more reading and found the solution.

Thank you and have a good day all.
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Old 04-23-2017, 08:45 AM   #3
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So to have it here for other readers, what exactly are you going to do?
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Old 05-07-2017, 08:57 AM   #4
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Sorry for the Late reply, but I wanted to try it first prior to posting to check if it works.

So far, it works as I tried it for several times and no oil leak as I lastly had.

I fitted a pop off valve between the oil catch tank and the intake manifold with a T connections and a mini pcv valve so that when in negative pressure, the pop off valve is open allowing the air to move towards the manifold and mini pcv is closed.
When there is boost, the pop off valve would close and the mini pcv valve would open to atmosphere so that vacuum is maintained all the time in the crankcase preventing the back flow of oil into the turbo.

Also, I went through another thread in the forum, " Just another M54 Turbo Build, By the people, for the people" page 13 (as I remember), where he had a good solution too with a video attached.

Hope this is clear and helps.
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