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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Oil in my charge pipe when I switched to STETT.



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      05-04-2010, 11:13 AM   #1
kennejp
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Oil in my charge pipe when I switched to STETT.

Hey guys. Like the title says, when I was changing over to the Stett BOV and charge pipe I noticed my stock pipe had oil in it. Is this why people get the oil catch can? Is this going to hurt my engine?
Thanks
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      05-04-2010, 11:21 AM   #2
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Originally Posted by kennejp View Post
Hey guys. Like the title says, when I was changing over to the Stett BOV and charge pipe I noticed my stock pipe had oil in it. Is this why people get the oil catch can? Is this going to hurt my engine?
Thanks
Yes, this is the reason why people get an OCC. Not sure if it will hurt the engine, but all I know is that it helps reduce the oil residue in the charge pipe as well as the intercooler.

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      05-04-2010, 11:43 AM   #3
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I would assume that the oil would make the valves dirty since nothing but air (and oil) touches it. Might want seafoam the car and get a good catch can, either ar or bsh is a great option.
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      05-04-2010, 12:57 PM   #4
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Quote:
Originally Posted by Bimmer335i07 View Post
Yes, this is the reason why people get an OCC. Not sure if it will hurt the engine, but all I know is that it helps reduce the oil residue in the charge pipe as well as the intercooler.

This is definitely the reason why an oil catch can like the BSH OCC comes into play. The purpose of a catch can system is to collect/vent the blowby vapors inherent as part of the combustion process. The factory setup sucks these oily vapors directly back into the engine exposing them to everything in their path.

In the short term getting these vapors out of the combustion path reduces knock retard by not allowing oil vapor to mix with the air fuel mixture. In addition the more free flowing lines allow the engine to rev easily giving a more responsive feel to the engine as a whole.

Over the long haul these untended to vapors will build up over the intake valves leading to a host of running issues and an expensive repair bill to fix. With a catch can installed you will save yourself from dealing with this hassle
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      05-04-2010, 01:25 PM   #5
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also look at the RSD one to compare.
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      05-04-2010, 02:32 PM   #6
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McKinney catch can is a good alternative also.
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      05-05-2010, 04:53 AM   #7
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It is shocking to see how much oil coats your pipes the first time you remove it. I had a Riss oil catch can, but because it leaks so much I went over to the BSH catch can. The BSH is a fully welded unit that is built in house. BSH uses CNC'd adapters and push lock hose too, so the setup is a quality OCC.
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      05-05-2010, 08:09 AM   #8
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Quote:
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It is shocking to see how much oil coats your pipes the first time you remove it. I had a Riss oil catch can, but because it leaks so much I went over to the BSH catch can. The BSH is a fully welded unit that is built in house. BSH uses CNC'd adapters and push lock hose too, so the setup is a quality OCC.
+1 i was definitely shocked when i swapped out the stock intercooler.
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      05-05-2010, 08:22 AM   #9
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Quote:
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+1 i was definitely shocked when i swapped out the stock intercooler.
+2 I installed my AA intercooler this past weekend and was shocked at the amount of oil I found in the IC piping.

OCC is definitely my next mod.
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