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Old 01-23-2020, 10:23 AM   #1
Kneedspeed
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Who has put a catch can in their E46?

If so, I'm looking for a recommendation.

of course, I've viewed the 50s kid how-to videos but he used a Ebay special for $20 that backfired on him (had a flaw leading to vacuum leak)

I don't really want to shell out $250 on the bigger kit so I'm wondering if there's something in between.

Thanks.
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Old 01-23-2020, 10:54 AM   #2
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just buy a can without this stupid level meter. it's cheap.
and YES, this is a MUST mod. my M54 completely stops eating oil after the CCV delete.
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Old 01-23-2020, 12:10 PM   #3
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catch can has been recommended to me many times, and i'm sure it works but i still haven't tried it .. i guess because of the maintenance of emptying the can and the fact that there are so many good CCV alternatives: O2 pilot mod, PCV, larger M5 CCV, M56 valve cover.
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Old 01-23-2020, 12:16 PM   #4
LukeBMW
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I did put a catch can for my car. My car still burning oil 1 quart for 1,700 miles. I bought on ebay for $21. It's pretty good oil catch can. ebay item # 254174623445
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Old 01-23-2020, 09:01 PM   #5
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No catch can on either the E39 or the E46, but both have the O2Pilot mod and minimal oil consumption.
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Old 01-23-2020, 09:08 PM   #6
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Try this and eliminate the ccv, my friend has it on his dad's e39 m54b30 and works really well, good crankcase vacuum too. https://xoutpost.com/bmw-sav-forums/...-problems.html
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Old 01-24-2020, 12:58 AM   #7
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I've just changed out the front and rear main seal-

you really don't want much negative pressure in the crankcase.
Those flimsy little things won't stand up to 15 inches of mercury.

In retrospect, I should have sourced real seals, the kind that don't go hard
and leak like old rope seals did. Maybe next time.

t
not.impressed.with.'progress'.
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Old 01-24-2020, 10:06 AM   #8
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Quote:
Originally Posted by BaliDawg View Post
No catch can on either the E39 or the E46, but both have the O2Pilot mod and minimal oil consumption.
After doing some more research, I'm now sold on the O2pilot mod for the concept and relative convenience vs the catch can.

This should be good enough for me- I'm not shooting for 0 oil consumption, just want a marked improvement.

Thanks to everyone for the input!
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Old 01-24-2020, 12:51 PM   #9
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I did the M56 cover over a catch can or the O2Pilot mod. This is because I think the O2 mod puts way too much negative vacuum in the engine, and could cause RMS damage and leaks.
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Old 01-24-2020, 02:28 PM   #10
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Quote:
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I did the M56 cover over a catch can or the O2Pilot mod. This is because I think the O2 mod puts way too much negative vacuum in the engine, and could cause RMS damage and leaks.
Maybe you’re thinking of the CCV bypass mod as documented on xoutpost? The O2Pilot mod simply connects a small vacuum line from the oil separator port to a port on the back of the IM. Crankcase vacuum goes up a bit, but not a lot like that other bypass mod.
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Old 01-24-2020, 03:52 PM   #11
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Next time my CCV needs replaced im going to try and fit provent 100 in its place
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Old 01-24-2020, 05:09 PM   #12
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I put a catch can in my 320. My oil consumption was pretty bad, even by BMW standards, and the O2 pilot mod didn't do enough.

I used what's been called the "E90" catch can, which made a great difference and has been bullet proof since fitment. I fabricated a bracket and mounted it in one of the drug bins.

Also included a PCV valve.

Only down side was the change in engine tone.

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BMW E46 320Ci Sport 2002 topasblau/hellbeige 125k miles


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Old 01-24-2020, 05:25 PM   #13
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https://germanautosolutions.com/stor...TqdYYgeOmXAavU
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Old 01-25-2020, 11:59 AM   #14
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Yeah, the 02 pilot 'mod' really only adds a little crankcase vacuum, NOT full intake manifold. 40 inches of water, or so, which is less than 2 psi.
And only at off- throttle, when the cars tend to burn the worst.

It was only an incremental improvement in mine, but changing from M1 to T6 helped, too.

I was going to try the 'N54' can that's all over ePay- more for diagnostics than anything else. I'd love to find a clear
cyclonic version, but didn't have much luck finding something that wasn't just an air line filter.

t
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Old 01-28-2020, 10:45 PM   #15
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That is definitely the ideal way to go. If it had been available when I did the M56 valve cover I would have done it, I spent nearly that much doing the cover mod. I was more concerned about the ccv freezing and hydro locking th motor, my oil consumption is 0 burned, some leaked.
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Old 01-29-2020, 12:13 AM   #16
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That is definitely the ideal way to go. If it had been available when I did the M56 valve cover I would have done it, I spent nearly that much doing the cover mod. I was more concerned about the ccv freezing and hydro locking th motor, my oil consumption is 0 burned, some leaked.
mhm, I ended up saving about 200 bucks when I did mine vs the G.A.S kit. Plus I like using BMW parts this way.
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Old 01-29-2020, 09:15 AM   #17
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I'm giving the "BavarianE39" CCV bypass modification a try this week. If that doesn't work, then I will scale up to a catch can (have one ready).
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Old 01-30-2020, 10:38 AM   #18
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Thanks for all the discussion and suggestions. Now I have some options after the o2pilot mod fails miserably!
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Old 01-30-2020, 03:58 PM   #19
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I put a catch can in my 320.
That is a very tidy install. I wish I had E46 OCD to be like you.
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Old 01-30-2020, 03:59 PM   #20
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I did it. Vids found on my youtube page
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