Do I need an oil catch can or valve cover or both?

ZanaX · 07-26-2013, 07:13 PM

I found a leak while working on my car and did some more investigating to find that there was a good amount of oil in my charge pipe. Do you guys recommend the BMS occ or should I check something else? I'm running procede with a FMIC and BMS intakes. Someone before mentioned to check the valve for the PCV system but I don't know where that is. And what aftermarket options are there for this valve cover? Thanks!

E90Company · 07-26-2013, 07:41 PM

I bought a new OEM check valve and RB PCV valve for the valve cover. Ran a BMS OCC at one point and had a bad experience, so I don't reccomend one personally.

robc1976 · 07-26-2013, 10:01 PM

Quote:

Originally Posted by E90Company

I bought a new OEM check valve and RB PCV valve for the valve cover. Ran a BMS OCC at one point and had a bad experience, so I don't reccomend one personally.

Really? What happened? I love mine.

E90Company · 07-26-2013, 10:26 PM

Quote:

Originally Posted by robc1976

Really? What happened? I love mine.

Car started blowing oil past the piston rings, and the car would smoke even with secondary cats in place. I concluded that it was due to excess pressure in the crankcase, because the OCC was reducing the proper vacuum needed to release the pressure through the check valve. The pressure had nowhere else to go except past the rings taking some oil with it. Went through a turbo set and a check valve. Turbos were dry. Day I took it off, within 10 miles no smoke. Replaced it with a new OEM check valve and an RB valve in the cover, and haven't had a crank pressure issue since.

Now I don't reccomend it to anyone. Again others have seen better results, but my FMIC is my OCC. Just clean it out every few thousand miles, and you get the peace of mind of proper crankcase pressure.

pits200 · 07-26-2013, 11:23 PM

I am against catch cans after going through 2 valve covers in 50k miles. Had the can off for 20k and maybe the valves get a little dirtier but they are going to get dirty on this car anyways.

robc1976 · 07-26-2013, 11:26 PM

A lot of crankcase ventilation issues are blamed on catch cans when in fact it is the valve cover itself...if the ports from the head leading to the valve cover are clogged you will get a pressurized crankcase.

07-26-2013, 07:13 PM	#1
ZanaX Private First Class 18 Rep 116 Posts Drives: A modded 335i Join Date: Mar 2011 Location: SF Bay iTrader: (0)	Do I need an oil catch can or valve cover or both? I found a leak while working on my car and did some more investigating to find that there was a good amount of oil in my charge pipe. Do you guys recommend the BMS occ or should I check something else? I'm running procede with a FMIC and BMS intakes. Someone before mentioned to check the valve for the PCV system but I don't know where that is. And what aftermarket options are there for this valve cover? Thanks! __________________ PROCEDE / VRSF DP / ETS EXHAUST / ETS INTERCOOLER / BMS DCI / ER CHARGEPIPE / TIAL Q BOV / MEGAN COILOVERS / H&R SWAYS / 20:10 TINT / M3 SPOILER / HAMANN SPOILER / SPLITTERS / LUX ANGEL EYES / 19'' MIRO 111 / HANKOOK V12 / ALUMINUM PEDALS / ESCORT HARDWIRE / GLOSS BLACK GRILLS / LED INTERIOR / HID FOGS
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07-26-2013, 07:41 PM	#2
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	I bought a new OEM check valve and RB PCV valve for the valve cover. Ran a BMS OCC at one point and had a bad experience, so I don't reccomend one personally.
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07-26-2013, 11:23 PM	#5
pits200 Colonel 547 Rep 2,590 Posts Drives: 09 335i X-Drive Black Sapphire Join Date: Mar 2010 Location: Pittsburgh iTrader: (1)	I am against catch cans after going through 2 valve covers in 50k miles. Had the can off for 20k and maybe the valves get a little dirtier but they are going to get dirty on this car anyways.
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07-26-2013, 11:26 PM	#6
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	A lot of crankcase ventilation issues are blamed on catch cans when in fact it is the valve cover itself...if the ports from the head leading to the valve cover are clogged you will get a pressurized crankcase. Attached Images __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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