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Old 04-16-2014, 11:02 AM   #1
cris90
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Default Oil catch can

Hello i'm going to be installing a catch can but not sure where to hook up.

I know you connect between the PCV valve and the intake manifold (thats easy)

But with 2 valve covers where do they connect to the intake or intake manifold?


I know the BRZ has dual catch cans, thats why i ask (relatively similar engine so i assume similar oil consumption) but the intake is a different design. I have a dual catch can laying around from my other car that i sold and i'm not 100% were the 2nd hose is on our car.
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Old 04-16-2014, 11:10 AM   #2
cris90
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need to know where our breather tube comes and goes to?
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Old 04-16-2014, 12:29 PM   #3
Commander Keen
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It looks like the right head has a PCV connection to the block, and the block connects to the intake manifold through the PCV valve.

The manual warns not to remove that first hose unless it's broken.

I couldn't find any connections between the crankcase and pre-throttle intake piping, so it looks like the crankcase may be under a partial vacuum most of the time.

The line to the manifold is probably the best place to intercept.
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Old 04-16-2014, 12:42 PM   #4
cris90
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[IMG][/IMG]

so the pcv is BLue, red is breather?

nothing pre throttle body
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Old 04-16-2014, 12:52 PM   #5
Commander Keen
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Blue is PCV, red is evap system.
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Old 04-16-2014, 01:07 PM   #6
cris90
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ok and there isn't anthing else connected to the manifold?

this is from subaru



the red (1AD66) is labeled as "HOSE-VACUUM "
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Old 04-16-2014, 01:11 PM   #7
Commander Keen
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All I could find in the service manual was a single hose connecting the block-mounted PCV valve to the intake manifold.

All hoses running to the manifold are vacuum hoses. IAD66 happens to service the evap system.
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Old 04-16-2014, 01:20 PM   #8
cris90
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ya i think we only have the 1 pcv valve. the brz and wrx both have 2 differnet hose, and different intake manifolds, we only have 1.
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Old 04-16-2014, 01:26 PM   #9
cris90
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FOUND IT!!



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Old 04-16-2014, 01:35 PM   #10
cris90
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1ad69, what goes to the intake manifold
11812 is the CONNECTOR-PCV HOSE
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Old 04-16-2014, 02:47 PM   #11
Commander Keen
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The manual warns against removing the hose connecting to 11821. There's no reason to put a catch can there anyway.
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Old 04-16-2014, 02:51 PM   #12
cris90
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then i think this is a single catch can engine
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Old 04-16-2014, 04:36 PM   #13
flyboy1100
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What will this do?
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Old 04-16-2014, 04:42 PM   #14
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It condenses and collects water vapor, oil mist, combustion products, etc from the crankcase that would otherwise be reintroduced to the engine.

It's good for keeping a cleaner top end and can tip you off to engine problems.
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Old 04-16-2014, 05:38 PM   #15
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Quote:
Originally Posted by Commander Keen View Post
It condenses and collects water vapor, oil mist, combustion products, etc from the crankcase that would otherwise be reintroduced to the engine.

It's good for keeping a cleaner top end and can tip you off to engine problems.
ahh.

where to buy?

Edit, it looks exactly like what I built for my motorcycle, sight gauge and all! Maybe I will just build one unless there is a cheap one floating around out there. I only built it for the bike so the crank breather would stop misting oil all over. Not really a problem in the car.

Last edited by flyboy1100; 04-16-2014 at 05:47 PM.
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Old 04-16-2014, 10:03 PM   #16
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this one is very tempting, i might even update my motorcycle can

http://mazda3revolution.com/forums/2...nder-50-a.html
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Old 04-16-2014, 11:15 PM   #17
Commander Keen
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I plan to use an oil filter and mount. The media in the filter should stop most of the oil mist.
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Old 04-16-2014, 11:47 PM   #18
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Quote:
Originally Posted by Commander Keen View Post
I plan to use an oil filter and mount. The media in the filter should stop most of the oil mist.
that would work too. how will you know when to change the filter out? any worry of condensation freezing in the media during the winter though? i get a lot of condensation in my bike catch bottle in the spring and fall.

what mount are you thinking?
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Old 04-17-2014, 12:13 AM   #19
Commander Keen
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I'm going to use a PL30001 with this: http://www.jegs.com/i/Derale/259/25005/10002/-1

I'll have to keep an eye on it at first, though the filter holds nearly a quart. I'm not too worried about freezing, but I'll have to drill out the anti drain back valve.
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Old 04-17-2014, 06:51 AM   #20
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Quote:
Originally Posted by Commander Keen View Post
I'm going to use a PL30001 with this: http://www.jegs.com/i/Derale/259/25005/10002/-1

I'll have to keep an eye on it at first, though the filter holds nearly a quart. I'm not too worried about freezing, but I'll have to drill out the anti drain back valve.
Drilling out the anti drain back will allow it to still breath if it were to plug up?
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Old 04-17-2014, 08:43 AM   #21
sgoldste01
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Quote:
Originally Posted by Commander Keen View Post
It condenses and collects water vapor, oil mist, combustion products, etc from the crankcase that would otherwise be reintroduced to the engine.

It's good for keeping a cleaner top end and can tip you off to engine problems.
Our cars/engines have a reputation for long-term reliability as they come from the factory. Is this catch can really necessary? Obviously, Subaru doesn't think so.

Sometimes I wonder if a person's desire to do what he thinks is helpful for his car might end up causing more problems than had he done nothing at all (or, at best, neither help nor hurt anything at all, which is just a waste of time and money).
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Old 04-17-2014, 10:11 AM   #22
foghelmut
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This whole concept is silly, I forgot engine designers really know a lot less about designing engines than guys on the internet.
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Old 04-17-2014, 10:48 AM   #23
Commander Keen
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Quote:
Drilling out the anti drain back will allow it to still breath if it were to plug up?
No, but it will allow it to breathe when the engine is not pulling a vacuum (WOT).

Quote:
Our cars/engines have a reputation for long-term reliability as they come from the factory. Is this catch can really necessary? Obviously, Subaru doesn't think so.
Subaru has a hard enough time getting its customers to maintain their oil level.

For most turbo cars, running the stock PVC setup results in the turbo, intercooler, and intake piping being coated in an oily film.

It's not necessary, but it will keep a cleaner top end, probably keep some oil out of the cats.
Quote:
This whole concept is silly, I forgot engine designers really know a lot less about designing engines than guys on the internet.
When engine designers were allowed to, they vented crankcase gases to the atmosphere.
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Old 04-17-2014, 11:02 AM   #24
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Quote:
Originally Posted by Commander Keen View Post
For most turbo cars, running the stock PVC setup results in the turbo, intercooler, and intake piping being coated in an oily film.
OK. How much do you think a catch can helps our normally-aspirated Imprezas?
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Old 04-17-2014, 11:18 AM   #25
auskip07
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Quote:
Originally Posted by flyboy1100 View Post
this one is very tempting, i might even update my motorcycle can

http://mazda3revolution.com/forums/2...nder-50-a.html
Seems like alot of work for something you can buy on ebay for 20 dollars
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