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11-17-2019, 06:48 PM | #1 |
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N55 catch can
Has anyone installed a catch can on an N55? I just purchased one off of Amazon (https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1) and was curious how to attach the outlet hose to the intake tube (the one with the electrical connection). It looks like the "flex" portion of the tube just slides onto the connection, but in my experience it isn't that easy! I will probably buy a replacement breather/vent tube in case I break the stock tube. I will also most likely need to reinstall the stock tube to pass smog.
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11-19-2019, 10:07 PM | #3 |
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Grrrrrr...….
I bought this off of Amazon on the recommendation from a purchaser on a forum I can't remember... Seems the ports on the can are 5/8" NPT to 3/8" for the hose and the factory hose is 3/4". Do you think I can fine a 5/8" to 3/4" barb? Not so far! I hope I can return this can and get one with the proper connections. Good thing I bought 2 extra factory tubes! |
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01-04-2020, 12:50 PM | #4 |
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At this point I'm throwing in the towel. I refuse to pay $200 for the quasi-direct fit unit and I'm having little success at finding a way for the hoses to pass each other without one crushing the other. There's just too little room there. If I could find a short 1" to 3/4" hose with a 45º elbow there may be enough room for the hoses to pass. I'll have to keep looking but for now.....
This project is a no-go. |
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01-06-2020, 10:06 AM | #5 |
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What have seen as far as the usefulness of this in n55s? I know n54s need walnut blasting and/or catch cans but whatever I found makes it look doubtful that this is such an issue with n55s
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01-06-2020, 11:04 AM | #6 |
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When I took the factory breather off to try and install the can, I stuck my pinky finger in the tube to check how much oily residue was in there. After ~56K miles there was a very, very light film on the metal part of the hose that attaches to the downpipe. The film was a light tan color and very thin. I easily wiped it off. I was a bit surprised (and pleased) that there was so little residue in the tube; especially considering part of it is corrugated plastic.
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01-07-2020, 08:27 AM | #7 |
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My indy mechanic checked my intake valves when he had my intake manifold loose for a valve cover gasket. At 94k and said they were surprisingly clean (just a thin film like you noted) and nowhere near needing a walnut blast. The PCV system on the N55 valve cover works far better than the N54 system so catch cans are pretty much pointless.
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02-06-2020, 07:51 PM | #8 |
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How to install A $25 Oil Catch Can
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02-06-2020, 09:04 PM | #9 |
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With how easy that is, throw a breather on the top of the catch can, don't have to worry about hood clearance, good to go.
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02-06-2020, 09:43 PM | #10 |
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Lol, I thought about getting a can with a breather, but I thought it might cause an issue with the pressure and the PCV system.
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02-06-2020, 10:34 PM | #11 |
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I've seen that. The thing he doesn't show just happens to be the hardest part; how does one get the two 3/4" hoses to pass in a space big enough for one?
How crushed are the hoses as they pass? Does the restriction cause any issues? |
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02-07-2020, 08:33 AM | #12 | |
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Getting those 3/4" hoses to pass each other was the hardest part of the install. They don't seem to be pinched at all or restricted. I am working on a intake cleaning video and I show the blow by the container has collected in only 1500 miles. It's a LOT. I believe I was getting excessive blow by, because of my PCV cap which has now been fixed.
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02-09-2020, 10:52 PM | #13 |
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Nice, I commented on your video
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02-10-2020, 07:22 AM | #14 |
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Could always just upgrade the pcv valve. I wonder if you could find something on thingiverse to print that would work. If you find something that looks good I could print and send it to you. I havent checked myself but you would be surprised. I just printed jack pad adapters for my stands and jack.
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02-10-2020, 08:58 AM | #15 |
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What kind of printer do you have? Link?
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02-10-2020, 02:59 PM | #16 | |
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Also, you plan on selling any of those jack stand adapters?? Lol!
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02-11-2020, 10:19 PM | #17 |
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Honest thoughts
So I've been around guys that use catch cans and guys that don't in turbo DI daily drivers, track and drift racers. While it doesn't hurt and everything helps, it's not going to prevent blow by. You will still need to do a valve cleaning periodically every 50-75k as routine maintenance. Because of this, my friends that choose not to use a catch can tell me not to bother. Just sharing what I've seen/been told.
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02-12-2020, 04:48 PM | #18 |
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Look at what BMWDoubles just posted regarding the VVT breather... that is why I'd do a catch can.
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02-12-2020, 05:34 PM | #19 | |
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From what I've read VW's are every bit as bad, if not worse, than the N54; Ford isn't much better. I haven't read anything on the other manufacturers as DI is relatively new to them. At least BMW have identified the issue and are correcting it. |
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03-17-2020, 02:11 PM | #20 | |
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03-17-2020, 05:29 PM | #21 | |
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Anyway, hopefully I'll get it done by the end of next month... |
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03-17-2020, 07:27 PM | #22 |
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Clean install
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