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Old 04-17-2014, 11:21 AM   #26
cris90
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before people start buying universal can i'm working with
http://www.saikoumichi.com/
That's why all the questions

to make a Impreza 12+/Crosstrek catch can, no homedepot brakets or drilling. It'll be installed without lifting the car up. WIll also have a drain plug to dump out without remove the can.

This is a great company with great product. I expect fairly soon as I sent them the dimensions this morning for the bracket. It will as of now be located on the passager side, same side as pcv valve, and will be mount near the fire wall.
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Old 04-17-2014, 11:27 AM   #27
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Quote:
OK. How much do you think a catch can helps our normally-aspirated Imprezas?
I won't know before installing it.
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Old 04-17-2014, 11:34 AM   #28
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just like to remind people how much oil do yu loose between oil changes?

I have 140 miles on my can and remove the pcv hose and oil dripped from the hose.
My guess, yu looking at half a quart ever 3-5k miles
or more
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Old 04-17-2014, 11:38 AM   #29
sgoldste01
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I'm one of the lucky ones with an Impreza that hardly consumes any oil at all between changes. I use a 6.5k mile oil change interval. My car has 26k miles on it.
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Old 04-17-2014, 11:39 AM   #30
cris90
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Old 04-17-2014, 12:40 PM   #31
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EDIT: The hose is 3/8" ID.

Last edited by Commander Keen; 04-17-2014 at 02:25 PM.
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Old 04-17-2014, 01:10 PM   #32
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Quote:
Originally Posted by foghelmut View Post
This whole concept is silly, I forgot engine designers really know a lot less about designing engines than guys on the internet.
Not true. On my motorcycle the breather went to factory airbox. This caused 2 problems:
1. Gummed up carbs
2. Eventually so much oil was in the airbox it began to leak.

Easy solution was a filter on the crank breather, that resulted in oily mist everywhere, a collector bottle solves this.

On this car, perhaps, I'm interested in it as an experiment to see how much oil is passing through the pcv

I plan to build my own, it isn't difficult and pvc and flat black spray paint is cheap!. I didn't use a baffle on the bike, but I might redo that one with a baffle if this works well

Last edited by flyboy1100; 04-17-2014 at 01:15 PM.
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Old 04-17-2014, 01:15 PM   #33
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Quote:
Originally Posted by cris90 View Post
before people start buying universal can i'm working with
http://www.saikoumichi.com/
That's why all the questions

to make a Impreza 12+/Crosstrek catch can, no homedepot brakets or drilling. It'll be installed without lifting the car up. WIll also have a drain plug to dump out without remove the can.

This is a great company with great product. I expect fairly soon as I sent them the dimensions this morning for the bracket. It will as of now be located on the passager side, same side as pcv valve, and will be mount near the fire wall.
Good company ive seen their products first hand, I havent used them on my own turbo car but maybe eventually when other issues are sorted out. I cant imagine them redesigning the Catch can. Where do you think it will mount?
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Old 04-17-2014, 01:46 PM   #34
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Quote:
Originally Posted by auskip07 View Post
Good company ive seen their products first hand, I havent used them on my own turbo car but maybe eventually when other issues are sorted out. I cant imagine them redesigning the Catch can. Where do you think it will mount?
I can tell you it will mount to the passage side, there 2 spots that are threaded into the chassis right below the strut. the bracket will start there and hold the catch can close to the engine over the ECU.

This way less travel for the oil/air. from the pcv.

I can't post pictures of the mock up as they don't belong to me. Once I get final bracket done and install I will post pics
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Old 04-18-2014, 12:00 PM   #35
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Quote:
Originally Posted by Commander Keen View Post
EDIT: The hose is 3/8" ID.


I'm guessing you measured?
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Old 04-18-2014, 12:17 PM   #36
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Yes. My filter mount arrived, so I should be able to get this done over the weekend.
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Old 04-18-2014, 01:22 PM   #37
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can you take pics? i'm curious as to how this will look with a filter
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Old 04-18-2014, 09:58 PM   #38
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Installation was a success. The filter is located behind the right fog light housing.








Last edited by Commander Keen; 04-18-2014 at 10:24 PM.
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Old 04-18-2014, 10:34 PM   #39
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Why did you hide it?

I assume you just took a 3/8" splice to connect to the pcv? Have a picture of that area?
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Old 04-18-2014, 10:50 PM   #40
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I couldn't find a good place for it under the hood where it would fit upright.

The filter inlet goes to the PCV valve in the block and the outlet goes to the intake manifold.



Accessing the filter is easy. Removing two snaps from the belly pan allows enough access to unscrew the filter and pull it out. Lifting the car is not necessary.
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Old 04-18-2014, 11:34 PM   #41
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my problem with this is that filter isn't designed to retain liquids)
my guess is only about 1-2oz can fit inside the filter

filters are designed to be positive pressure (oil is pushed through them)
What you have here is air being pulled through it. Pcv system need all he vacumm from the intake manifold, your probably seeing 5 or more psi less on the pcv side because of the filter restriction


IF, better when, your filter saturates instead of getting a drip-by-drip oil into the intake manifold its going to flow it large amount of oil into the manifold. Probably give you a nice black puff of smoke.


Better a proper catch can or oil separator and drain regularly.
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Old 04-19-2014, 12:04 AM   #42
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Quote:
Originally Posted by cris90 View Post
my problem with this is that filter isn't designed to retain liquids)
my guess is only about 1-2oz can fit inside the filter

filters are designed to be positive pressure (oil is pushed through them)
What you have here is air being pulled through it. Pcv system need all he vacumm from the intake manifold, your probably seeing 5 or more psi less on the pcv side because of the filter restriction

IF, better when, your filter saturates instead of getting a drip-by-drip oil into the intake manifold its going to flow it large amount of oil into the manifold. Probably give you a nice black puff of smoke.

Better a proper catch can or oil separator and drain regularly.
Not really any different then an air oil seperator for air tools.

I'm going to build one from pvc. Just need to figure out 2" or 3" pipe. I don't see any reason to drop more than about 20.00 on this project
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Old 04-19-2014, 12:11 AM   #43
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Quote:
Originally Posted by Commander Keen View Post
I couldn't find a good place for it under the hood where it would fit upright.

The filter inlet goes to the PCV valve in the block and the outlet goes to the intake manifold.



Accessing the filter is easy. Removing two snaps from the belly pan allows enough access to unscrew the filter and pull it out. Lifting the car is not necessary.
I see, you ditched the entire factory hose
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Old 04-19-2014, 01:18 AM   #44
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my problem with this is that filter isn't designed to retain liquids)
I'm not sure what you mean by this. I don't see why it would have trouble holding liquids.

Quote:
my guess is only about 1-2oz can fit inside the filter
A BITOG member claims 26oz. It's a massive can, and the L40017 is even larger.

Quote:
filters are designed to be positive pressure (oil is pushed through them)
Filters see only relative pressure, and I'm still running it in the same direction.

You're right that I can't let it fill up, but that's true of any catch can.
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Old 04-19-2014, 07:21 AM   #45
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26oz.... thats alot. I'm going to say I dough that. That's as much as a Starbucks venti.
My concern is your take filter elements and hoping they behave like condensing surface. Filters, by nature, want to allow everything to pass through, especially oil, the very thing we don't want to happen.

Consider this, blow by creates this crazy oil vapor, pvc is not in this car.
Blow by and oil mix, will the particulate from the blowby be cleaned by the oil filter? No. (Reason why there is a pcv system)

Now you have those vapor particulates passing through a oil filter hoping the filter condenses the oil and creates a trap for the blow by crap.

It's off label use seams contraindicated by its intentional function.
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Old 04-19-2014, 10:24 AM   #46
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Old 04-19-2014, 10:43 AM   #47
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Quote:
Originally Posted by cris90 View Post
FOUND IT!!



Great thread and all good info in regards to the oil catch can. It's more of an issue with today's 'dry intakes' as opposed to PCV systems on engines with carburetors or throttle body injection. Wet intakes would wash the oily crud into the combustion chamber, and you'd hardly notice it. Today, the oil can pool where ever it can in the IM.

Anyhoo... I'm TICKED that Subaru kept the crummy oil separator cover! p/n 11831 above on our FB engines. Those can turn into an oil leaking nightmare over time and the engine has to be pulled to remove/replace the cover if I remember correctly.
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Old 04-19-2014, 11:27 AM   #48
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26oz.... thats alot. I'm going to say I dough that. That's as much as a Starbucks venti.
Next time you're in a parts store, take a look at one.

Quote:
My concern is your take filter elements and hoping they behave like condensing surface.
The filter will stop suspended oil droplets and wick them away.

Quote:
Filters, by nature, want to allow everything to pass through, especially oil, the very thing we don't want to happen.
A filter that allows everything to pass isn't much of a filter. Oil will pass in liquid form, but it won't be suspended in the outgoing air as a mist.
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Old 05-01-2014, 04:04 PM   #49
auskip07
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anyone else purchase one and mount it?
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Old 05-01-2014, 07:44 PM   #50
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Default Sorry the pictures are so damn big

I just wanted a air oil separator. Something clear so I can see what/how much is being captured and something that wouldn't restrict air flow. I pick these up after work last Friday: Harborfreight - 3/8" Air filter and barbed fittings, Advanced Auto Parts - 2 PCV/Crankcase hoses, Walmart - Copper scrubby pads.




I removed the 40 micron brass filter element that has a long threaded screw holding it on. I replaced it with a small portion of scrubby, putting the screw through the middle of it. This has an automatic drain but I didn't want it to drain. I pulled the plug down to close it off and tied a wire around it to keep it closed permanently until I'm ready to drain it.






Teflon taped the these barbs and tighten....





This size hose gives a really snug fit to the barbs, PCV valve and the intake.







I didn't get a stainless steel scrub because the copper looked easier to mold into the size needed to fit in the bowl





Placement time. The engine compartment of cars today are really stuffed. I just sat it here. It's not going anywhere.






Closer shot. Got something in there too!





The hose connections. No hose clamp needed.






This picture is after 3 days

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