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Old 07-08-2002, 12:10 AM   #1
HpiRally
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Question Oil Catch Can Installation?

Anybody have some pictures of theirs installed and how it is done? Any help is appreciated.

I have a MY98 RS just to let ya know.

Joe
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Old 07-10-2002, 01:19 AM   #2
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If you want pictures, search "catch can" and look for the threads with paperclips in the title. THere was quite an extensive thread with many pictures a few months back.

cheeRS,

Greg
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Old 07-10-2002, 02:46 PM   #3
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I've been interested in this too.......I've done a search......have not found anything with any sort of pics and such......
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Old 07-10-2002, 03:27 PM   #4
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Here's my setup. You have to remove the stock intake and relocate the MAP sensor (If you look, it's just to the left of the catchcan.) Works fine. I have 2 more bungs to weld into the can for the valve cover breathers.

Eric
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Old 07-10-2002, 03:28 PM   #5
Eric SS
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pic 2
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Old 07-10-2002, 03:30 PM   #6
Eric SS
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One more thing, the nice thing is that all the holes are existing including the holes where I mounted the catchcan and the holes for the MAP sensor.

Eric
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Old 07-10-2002, 04:13 PM   #7
Legacy777
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Interesting setup........
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Old 07-10-2002, 05:25 PM   #8
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Yes, interesting....

What does it do?
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Old 07-10-2002, 06:12 PM   #9
Eric SS
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Quote:
Originally posted by kickin_81
Yes, interesting....

What does it do?
It catches oil instead of recirculating it through the intake.

Eric
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Old 07-10-2002, 06:28 PM   #10
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Quote:
Originally posted by Imprezinator
and relocate the MAP sensor (If you look, it's just to the left of the catchcan.)

Eric
Just so you know that is not the MAP sensor. That is the ambient air temp sensor. You map is bolted to the top of your intake manifold, right behind the throttle body.

J
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Old 07-10-2002, 06:31 PM   #11
Eric SS
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Quote:
Originally posted by jeffg


Just so you know that is not the MAP sensor. That is the ambient air temp sensor. You map is bolted to the top of your intake manifold, right behind the throttle body.

J
Really?? hehe.. I guess you learn something new everyday.
I'm not even sure why I thought it was the MAP.

Eric
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Old 07-11-2002, 01:28 AM   #12
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Why do you need an oil catch can on a NA car?
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Old 07-11-2002, 02:21 AM   #13
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Quote:
Originally posted by Jademonkey
Why do you need an oil catch can on a NA car?
My car is Turbo.

Eric
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Old 07-11-2002, 12:14 PM   #14
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Quote:
Why do you need an oil catch can on a NA car?
The same reason why you want it on a turbo car. In an ideal world you would not need a catchcan at all becasue ail would stay where it should and not splash around. A turbo car has more blow-by than a NA car (assuming equal build engines, ie no bad rings ect) so it has the capasity to blow more oil out of the engine breathers. NA cars can still suck oil out of the breathers, but usually not in the same quantities. A car with modified suspention, tires and brakes can move oil around more as well and case it to escape into the breathers. If your intake feels oily on the inside near the ports, you could use a catch can to keep it out of your intake.

cheeRS,

Greg
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Old 07-11-2002, 12:25 PM   #15
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I have one included with my Rallispec intake.
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Old 07-11-2002, 01:42 PM   #16
Eric SS
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Quote:
Originally posted by ciper
Imprezinator: I guess you havent seen a screwed up IAC yet becuase of crap running through it from the crank.

Even with an 8 inch elevation from the crank (not counting the valve covers) there is alot of oil being sucked through those pipes. With subarus unusual (in my mind) design of a pcv valve that is bypassed through the intake before the throttle place it only makes it worse.
I'm not trying to be rude but can you clarify what you are talking about? I don;t understand. I don't have any oil recirculating through my intake. not even PCV. And I've never heard of an IAC going bad from oil either but I don't do a lot of Subaru work.

Eric
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Old 07-11-2002, 02:53 PM   #17
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You're really not sucking any oil through the IAC valve. All the vent & PCV hoses go in past the IAC valve air pickup. It does get carbon'd up a little, and a little slimey due to the fact it's right under the PCV stuff.
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Old 07-11-2002, 03:30 PM   #18
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Sorry my brain was on backwards today, I was think throttle plate when I said IAC!

The crank vent goes to a T connection, one of which is on the pcv valve and the other is directly into the intake before the throttle plate. Any time you have a vacumn most of the oil goes through the intkake. This happens alot at idle when the throttle plate is mostly closed. Both carbon dust and oil gets stuck to the plate, and probably everything else.
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Old 08-20-2002, 01:11 PM   #19
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Wouldn't having a catch can mess things up a little? it seems the oil/oil vapor recollection system needs vacuum to work properly. With the catch can, there's no vacuum since the intake is left out.

-IggDawg
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Old 08-20-2002, 01:19 PM   #20
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The catch can is connected to all of the breathers AND the intake to generate vacuum. It is "inline" so to say with what is already there. Your not changing anything, you are just adding a collection tank. Just like adding an air water seperator to a compressor line.

You need to make sure that you connect your vacuum line before the turbo (if you have one).

cheeRS,

Greg
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Old 08-20-2002, 01:36 PM   #21
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My idea of the routing for the catch can would be that it matches exactly that of an engine without one, just the can is inline.

From that image I see a filter on the top. Either there is no vacuum to draw the air out of the crank case and valve covers or he is introducing additional air into the intake that runs through the catch can. I only see one line entering the catch can, did you T the crank case and valve covers together? How is the PCV valve functioning? It seems that instead of a filter on top you should have a hose plumbed back into the intake before the turbo.


Either way I still cant figure out why there is a filter on top of the catch can, I always thought the crankcase and valve covers werent supposed to be postive pressre (vacuum or equal to atmosphere)? Seems like if the catch can and its filter is in any way restrictive you would be putting pressure on the oil pan gasket and on the valve cover gaskets, couldnt that lead to leaks?

Edit: Perhaps I need to study the piping on the turbo engine, maybe I have missed something?

Last edited by ciper; 08-20-2002 at 01:45 PM.
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Old 08-20-2002, 04:19 PM   #22
Section 8
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Oh! in the picture!!!

I would always plumb it back to the intake. You can run it with out it just fine (as alot of people do) but it is best to keep as much of a vacuum in the crank case as you can.

Some people belive there to be gains to venting your crankcase to the atmosphere, this is a VERY minimal gain in a modern, properly running engine. If you have a worn out engine with lots of blow by, you can see good gains becasue you are getting more air instead of engine exhaust from the blowby in the crank case. You would have much better performance by replacing the rings, than venting to the atmosphere.

I have a friend with a ~76 Bronco, and when we took off the breather from the filter pan, it was like a second exhaust pipe emptying into his intake tract.

cheeRS,

Greg
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