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10-24-2017, 05:24 PM | #1 |
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Brown/rusty water oil catch can N55 82k
I bought my car @74k stock from an older gentleman. Within the first few months I installed the BMS oil catch can along with the BMS intake & charge pipe. The car is now FBO and is driven spiritedly. I put under 3k on the car per summer and I am about to do my pre winter storage oil change. The temperatures in New England have fluctuated between mid 30s in the morning to nearly 100 this spring, summer, & into fall. My car uses no oil and has had no drivability issues engine wise.
The catch can never seems to have anything in it. I pulled it off and there was about an ounce of rusty brown colored water with a film of rust coloring on the bottom. No oil at all and there never seems to be. Is this normal? Last edited by f87CSdrifterential; 10-24-2017 at 05:36 PM.. Reason: engine/oil condition/consumption. |
10-24-2017, 06:18 PM | #2 |
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N55 has a good PCV system. A catch can in an N55 is just clutter in the engine bay that does nothing. I think that because the N54 had quite an average PCV system its easy to re-purpose a product and market it to the newer engine too.
The BMS catch can is a high flow design as it would impede the PCV system otherwise. A high flowing catch can does not catch much oil. Even on the N54 it doesn't catch much oil
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10-25-2017, 10:10 AM | #3 | |
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I run my Mishimoto can in reverse which has a screen on it that provides something for the oil to collect on before air passes through the can. This is the only way I've ever been able to get it to catch ANYTHING. Oil still gets through and coats the inside of piping, btu it's better than nothing. Its a low cost/high mark-up item for vendors. |
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10-25-2017, 10:53 AM | #4 |
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I recently did an intake cleaning for the valves ect. I own an N55 and found oil in the intake. Ordered the Mishimoto catch-can. I thought that the N55 was a better system compared to the N54 but this discovery shows that oil can blow by if you drive your car hard at times. Good rule of thumb is catch-can for any turbo car.
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10-25-2017, 11:51 AM | #5 |
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I've got a BMS can and, like the OP, it seems to collect water with just a little oil.
Seems to me that's still a good thing since that's condensed water vapor that would have mixed in with the oil and then worked it's way all through the motor.
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2012 135i Mods: air scoops, CP, K&N filter, PS1, ADE FMIC, BMW PE, JB4, 1M front body, full M3 suspension front and rear, M3 brakes front and rear, M3 rear subframe and LSD
Owned so far: 88 M3 x 2, 95 325is, 95 M3 x 2, 06 Mini Cooper S, 08 335 xi, 09 Z4 35i, 01 M3, 12 135i |
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02-03-2019, 05:53 AM | #7 | |
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2k15 335i Msport xdrive 6spd
Wagner Comp2 FMIC,FTP CP,stock exhaust. Fabspeed Sport catted DP, KW V2 coil overs,FBO BM3 Stg 2 |
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02-04-2019, 07:34 AM | #8 | |
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What purpose does a screen serve on the exit port? You think the screen will prevent oil from exiting the can lol? There is a vacuum on the exit port... meaning any oil the gets on the screen or collects on it would be sucked into the intake. Hence why I run the can in reverse... oil collects on the screen as it enters/diffuses into the can and then vacuum pulls it down into the can. Seems to work better this way for me. It's really not a big deal to run it either way. Last edited by bbnks2; 02-04-2019 at 08:16 AM.. |
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02-04-2019, 12:48 PM | #9 | |
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Just found it interesting that you would reverse engineer the process plus you are getting some oil in your intake
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2k15 335i Msport xdrive 6spd
Wagner Comp2 FMIC,FTP CP,stock exhaust. Fabspeed Sport catted DP, KW V2 coil overs,FBO BM3 Stg 2 |
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02-04-2019, 01:27 PM | #10 | |
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The screen is there to keep debris from entering the intake. Since I have the air inlet attached to the outlet it just means any debris coming out of my valve cover and ENTERING the can will get clogged in the feed line pre-catch can. There is really no debris to speak of though for the screen to catch so it's useless for that purpose. That is why I thought to run the can in reverse and use the screen that's built into the outlet port as an air filter for oil to collect on before the air passes through the can and into the clean air intake tract. Debris still gets caught and now the screen also helps separates oil/air. I obviously ran the can the intended way for quite some time... I stated I had an oil residue BEFORE I began running the can in reverse. Last edited by bbnks2; 02-04-2019 at 02:21 PM.. |
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02-05-2019, 02:24 AM | #11 | |
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Any oil residue I get ends up in the can pre filter and stays in the can.No oil ends up in my intake post filter which is hooked up to my vacuum source (turbo intake pipe).Again no check valve. The filter is helping keeping oil out of my intake. I used to have it reversed like you unknowingly and I got oil in my intake, compressor side of turbo and the entrance of my FMIC. Not anymore when I hooked it up how Mishimoto states. If it works for you I guess that is all that matters. Being that we are in NY assuming NYC I have no problem showing you my setup.
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2k15 335i Msport xdrive 6spd
Wagner Comp2 FMIC,FTP CP,stock exhaust. Fabspeed Sport catted DP, KW V2 coil overs,FBO BM3 Stg 2 Last edited by ceedawg; 02-05-2019 at 02:44 AM.. |
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09-05-2019, 07:32 AM | #12 |
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Don’t scold me please.
Why doesn’t anyone vent to atmosphere? If the turbo is sucking the oil straight through then doesn’t it make sense to vent to atmosphere? I just bought a 135i and just did a charge pipe mod and noticed oil in the stock one. |
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