Welcome to the North American Subaru Impreza Owners Club Saturday August 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 07-10-2005, 11:51 AM   #26
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

Quote:
Originally Posted by Charlie-III
OK, I may be wrong....but:

1- this statement "Exhaust gasses cool as they go through the catch can and associated tubing. As the temperature drops, water vapor condenses. This can cause a surprising amount of water to accumulate in the can. " is wrong in this thread. No exhaust gases end up in the oil catch can.
What you state is correct (and is why you see water dripping out of exhaust tips) in another context, but not here.
I agree that 'exhaust gasses' is not the correct term, but I'm still at a loss for a better term in this case. 'Nasty foul toxic filthy vapor the crankcase contains', my first idea, was a little too verbose.

I'm entirely open to suggestions for a more accurate term...

Quote:
2-You don't really want to PRESSURIZE an engine block (in the oil gallery), you really only want to pull a vacuum. this reduces some of the pumping of air underneath the pistons as well as removes combustion chamber gases that get by the piston rings.
.
Here I just wanted to point out that it wasn't me that suggested that 'pressurizing' was a good idea, and someone else already corrected whoever it was that did write that. I've actually spent the last few days looking into a vacuum pump to use in place of the pcv. :-)
* Registered users of the site do not see these ads.
The Deliverator is offline   Reply With Quote
Old 07-10-2005, 02:17 PM   #27
Charlie-III
Scooby Specialist
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

Default

stanh04wrx: Don't get me wrong, I like your work on this thread.
I just wanted to clear up a few things.

As to using a vacuum pump for the block, any possible gains would more than likely be negatively offset by the power required to drive the pump. So, just make sure the existing system is working correctly.

To anyone else, the PCV is a spring loaded check valve that works on vacuum. Yes, you can clean them (I use carb cleaner). To check them, remove and shake end to end. If you hear a clicking, the spring loaded valve is probably working OK.
A PCV is fairly cheap, so it may be better to just replace, but keep a clean one handy "just in case".
Charlie-III is offline   Reply With Quote
Old 07-10-2005, 03:07 PM   #28
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

I actually just got back in from replacing the PCV valve on my 04 wrx. Sounded a little gummed up compared to the new one, but definitely still working. Seemed kind of pointless because of my planning to replace it with a pump, but the pump is at least a month away.

I got the idea for a vacuum pump from a recent thread in the 2.5l forum here. Did a lot more research and it seems legit. Doesn't seem to violate any of those pesky conservation of energy laws, either. :-) Can't hurt to try, so I'm going to try to snag an electric vacuum pump from a local u-pull-it.

Oh, on the subject of pcv's... North Ursalia helped me out when I was looking for this, so I'm going to post the info here to help people who do a search to find it- 2004 wrx pcv valve part number is 11810AA040. Around $15, and it's just the valve. For abour $7, you can get the valve *plus* the plastic fitting that it lives in. Much easier to swap out, and it costs less.
The Deliverator is offline   Reply With Quote
Old 07-10-2005, 05:22 PM   #29
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

I've edited the faq so that 'exhaust gasses' has been replaced with 'blowby products' for the sake of accuracy. Thanks to Charlie-III for pointing out the potentially misleading wording.
The Deliverator is offline   Reply With Quote
Old 07-17-2005, 10:31 AM   #30
Peaty
Techno Sapien
Moderator
 
Member#: 449
Join Date: Oct 1999
Chapter/Region: MWSOC
Location: Lawrence, KS
Vehicle:
2010 Legacy 3.6R Lim
Azurite Blue Pearl

Default

couple of CC install links from our site:

http://www.scoobymods.com/forums/showthread.php?t=2769

http://www.scoobymods.com/forums/showthread.php?t=3346

feel free to move them in to the FAQ, nice job BTW

Peaty

www.ScoobyMods.com
Peaty is offline   Reply With Quote
Old 08-03-2005, 04:07 PM   #31
drewdogg
Scooby Specialist
 
Member#: 90003
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Mars, PA
Vehicle:
2005 STi
OBP

Default

I dont know how else to say this without sounding like im telling you but...

i thought PCV was to vent crank case exhaust gases. There is a small amount of exhaust blow-by past the piston rings which is what's being vented in PCV system. This is passed back to the intake to be reburned reducing emissions. In the ooold cars they just has a hose (kinda like a peet trap *spelling* for a sink or toilet) bent like a 'J' that came right from the crank case that would vent the gases into the blow by air from driving.
drewdogg is offline   Reply With Quote
Old 08-03-2005, 06:20 PM   #32
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

Not sure what you're referring to. Does the FAQ somewhere define the PCV line as doing anything besides venting crankcase gasses? It definitely shouldn't. If you've found that it does, let me know where and I'll fix it.
The Deliverator is offline   Reply With Quote
Old 08-04-2005, 08:51 AM   #33
drewdogg
Scooby Specialist
 
Member#: 90003
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Mars, PA
Vehicle:
2005 STi
OBP

Default

No, i was just commenting on what Charlie-III said:

Quote:
1- this statement "Exhaust gasses cool as they go through the catch can and associated tubing. As the temperature drops, water vapor condenses. This can cause a surprising amount of water to accumulate in the can. " is wrong in this thread. No exhaust gases end up in the oil catch can.
What you state is correct (and is why you see water dripping out of exhaust tips) in another context, but not here.
He is right, where there is exhaust blow by past the rings, which would mean there is exhaust gases in the catch can, thats what the PCV system is for.

And just a bit of something i actually learned at school --- the water dripping out of the muffler is from the catalytic converter, where it uses a metal screen (which is a catalyst-duh) that converts and combines exhaust gases into more 'earth-friendly' gases; oxidizes hydrocarbons (unburnt fuel) to carbon dioxide and water, reduces nitrogen oxides to nitrogen and oxygen, and oxidizes carbon monoxide to carbon dioxide.
drewdogg is offline   Reply With Quote
Old 08-17-2005, 02:59 PM   #34
Rick Schu
Scooby Newbie
 
Member#: 34661
Join Date: Mar 2003
Default

I've been heavily researching catch cans and have come up with the following:

1. Money no object, the most effective catch can is the Racor CCV4500. It is actually designed specifically to remove oil from a PCV system, has a replaceable filter, has a bypass if the filter becomes clogged, and drains out of the bottom (supposed to go back to your oil pan, but you can add a petcock if you want). These are used on turbo-diesel trucks and marine engines. This model is effective up to 350 HP. I've found it online from about $215 to $250. More info at: Racor crankcase ventilation filter

2. Second best, as mentioned before, is the Accurate Machine Works AMW001. It is billet alluminum cylinder that uses a stainless steel mesh "filter" that helps to condense the oil and a series of "undercut" on the cylinder wall keep the oil from climbing back up. Very high quality piece. Problem is, on August 1st they increased the price from $80 to $160. I emailed them and they said it was due to a production cost increase.
Accurate Machine Works

3. Next up you have the usual catch cans - Greddy, Helix, Perrin for between $75-$100. People complain that the cylinder is just empty, but they actually do work, to an extent. What happens is, the air goes into the cylinder and swirls around the walls where the oil vapor condenses and because oil is heavier than air, falls to the bottom of the tank. People add wool and such to these, but I'd worry about something breaking off and getting in my turbo. I would imagine that the round cylinder designs would be better at collecting the oil, but I don't quite know the physics behind it.

4. DIY - A lot of people are using the air compressor filters available at home improvement stores. Parts for this conversion are around $20-30 or so. They are usually much smaller than the catch cans in #3. Seems like the best results come from removing the filter. Again, the air swirls around in the container and collects. Problems with this set up is 1. They are not designed to take extreme heat (such as close to the turbo), so mounting options are limited. 2. There are precautions about using the filter with synthetic oil vapors as this may cause the container to shatter (why, I'm not sure).

5. DIY - $3 - cheapest alternative is attaching the Fram G3 fuel filter. This is a generic fuel filter with a clear container. When it becomes saturated with oil, just buy a new one and replace. Typically lasts people between 1-2 oil changes. Problems are some arguments about the 2-way flow may be affected as the filter will have more restriction one direction than the other. The consensus is that the filter should be set up to flow in the direction of the intake. Also, if you don't watch the filter and it becomes too saturated, it might create a big problem.
Rick Schu is offline   Reply With Quote
Old 08-17-2005, 03:10 PM   #35
Rick Schu
Scooby Newbie
 
Member#: 34661
Join Date: Mar 2003
Default

Also, Crucial Racing has a catch can in development. I'm curious what they will come up with as usually their stuff is high quality. They say the development is going slow, though.
Rick Schu is offline   Reply With Quote
Old 08-24-2005, 03:23 PM   #36
tm999xxx
Scooby Specialist
 
Member#: 34408
Join Date: Mar 2003
Chapter/Region: Tri-State
Location: Beat it nerd!
Vehicle:
07 Spec B
SoapBox?

Default



^^New mini Catch can...In developement as we speak should be ready by next week

Last edited by tm999xxx; 08-24-2005 at 03:52 PM.
tm999xxx is offline   Reply With Quote
Old 08-31-2005, 09:24 AM   #37
Snoop
Scooby Newbie
 
Member#: 20626
Join Date: Jun 2002
Location: Minnesota
Vehicle:
2002 WRX Wagon
Silver

Default

Where does one get foam lawn mower filters? I have two catch cans installed, but they're not collecting anything substantial. I've had them on for a couple weeks now.

I went on the cheap and did the air compressor filter route. I've tried with and without that hard white thing screwed into the cap. With the white thing in, it becomes darker in color, but nothing is collecting in the bottom. I'm guessing my air flow is too smooth through the cans?

Does anyone have the air compressor filter versions and is catching anything substantial without filtering media?
Snoop is offline   Reply With Quote
Old 09-05-2005, 02:31 AM   #38
vipernj
Scooby Specialist
 
Member#: 86854
Join Date: May 2005
Chapter/Region: Tri-State
Location: Rockland, NY
Vehicle:
2004 fx35 02 Z06

Default

Why is is bad to "T" off the PCV and crank lines into the can, cap off the inlet and then run the line out of the can to the lines of the front of the intercooler? This is how I installed mine, but in the FAQ it says not to do this because it throws boost in places it shouldnt be.. I following the directions on www.scoobymods.com for "Greddy Catch Can Install." Should I change it over?
vipernj is offline   Reply With Quote
Old 09-05-2005, 09:10 AM   #39
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

Quote:
Originally Posted by vipernj
Why is is bad to "T" off the PCV and crank lines into the can, cap off the inlet and then run the line out of the can to the lines of the front of the intercooler? This is how I installed mine, but in the FAQ it says not to do this because it throws boost in places it shouldnt be.. I following the directions on www.scoobymods.com for "Greddy Catch Can Install." Should I change it over?

The crankcase should always be under vacuum. Off boost, this vacuum comes from the intake manifold and inlet hos. On boost, the PCV valve closes, blocking off the connection to the intake manifold and all the vacuum comes from the air inlet. The reason this happens is because, on boost, the intake manifold has positive pressure rather than vacuum.

Unless I'm mistaken, the valve covers *can* see boost. If you T the valve covers into the crankcase vent line, you're going to be stuffing more foul air into the crankcase instead of sucking out what's already there.

Maybe if you kept the PCV valve attached to both the crank vent and the intake manifold and T'd the valve cover vents in between the PCV and the turbo inlet you'd be ok. Then again, maybe not.
The Deliverator is offline   Reply With Quote
Old 09-10-2005, 06:43 PM   #40
HighPlainsDrifter
Scooby Newbie
 
Member#: 91979
Join Date: Jul 2005
Location: The Blue Lagoon
Vehicle:
2004 STI
Blue

Default

This is how I did my oil catch can on the Valve-cover side.
I hope this is a correct demo. I wrote it like a how-to, but I'm posting it here to let people tell me if its done right.

Supplies from Home Depot
Clamps
Connectors
Oil Catch

Walk-through
Step 1
Step 2
Step 3
Step 4
Step 5

I haven't yet tried to do the crankcase side.
HighPlainsDrifter is offline   Reply With Quote
Old 09-19-2005, 10:20 PM   #41
max_psi
Scooby Newbie
 
Member#: 96373
Join Date: Sep 2005
Default Greddy catch can in GC8

Hey Guys,
Hoping you can help me I don't know if this is the right place to post. I'm am going to hook up a Greddy catch can with two inputs, on the crank case only. I was going to connect one end of the catch can with a t piece between the crack case vent tube and PCV tube, and the other end of the catch can to the intake manifold. The problem is where in the engine bay of my GC8 are these located. Can anyone see a problem with my installing it this way? Has anyone got any pictures of the GC8 with a catch can installed?
max_psi is offline   Reply With Quote
Old 10-02-2005, 07:02 PM   #42
spoolinsuby
Scooby Specialist
 
Member#: 80182
Join Date: Jan 2005
Location: Spring Hill, FL
Vehicle:
Look ing for a GG
Wagon

Default

Quote:
Originally Posted by stanh04wrx[I
Wrong way:[/i]
Disconnect the PCV<->Inlet line as well as the Crank Vent<->Inlet line. "T" the PCV and Crank vent lines together, and run the remaining end of the "T" to a single nipple on the inlet pipe. Cap the remaining nipple on the inlet. You'll be sending boost into places that definitely shouldn't ever see any. Bad idea.
How does boost get in the system?
spoolinsuby is offline   Reply With Quote
Old 10-22-2005, 11:51 PM   #43
gpatmac
Scooby Guru
 
Member#: 18446
Join Date: May 2002
Chapter/Region: MAIC
Location: Alexandria, VA
Vehicle:
2002 WRX wagon
psm

Default

.....

Last edited by gpatmac; 10-23-2005 at 02:46 AM. Reason: still getting my thoughts together
gpatmac is offline   Reply With Quote
Old 10-23-2005, 12:19 AM   #44
gpatmac
Scooby Guru
 
Member#: 18446
Join Date: May 2002
Chapter/Region: MAIC
Location: Alexandria, VA
Vehicle:
2002 WRX wagon
psm

Default

......

Last edited by gpatmac; 10-23-2005 at 02:46 AM. Reason: still getting my thoughts together
gpatmac is offline   Reply With Quote
Old 01-08-2006, 10:30 AM   #45
TexRex2002
Scooby Specialist
 
Member#: 36303
Join Date: May 2003
Chapter/Region: TXIC
Location: Houston
Vehicle:
06 Evo IX
silver

Default

Quote:
Originally Posted by stanh04wrx
That is definitely a super clean installation. If I were going to pay $200 for a pair of catch cans I'd buy those for sure.

200? pff... try 320 for just the cans!!!
TexRex2002 is offline   Reply With Quote
Old 02-06-2006, 08:02 PM   #46
chrisarella
Scooby Specialist
 
Member#: 35584
Join Date: Apr 2003
Chapter/Region: South East
Location: www.chrisarella.com
Vehicle:
1965 FFR Roadster
Coyote + TR-6060

Default

FYI stanh04wrx and all:

I just thought you should know, the link to the exmple at the top of this thread that points to the ImprezaWRXSTi forum has changed to:
http://www.iwsti.com/forums/showthread.php?t=17214
chrisarella is offline   Reply With Quote
Old 02-06-2006, 09:47 PM   #47
The Deliverator
Scooby Specialist
 
Member#: 42376
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2006 92x Aero
Midnight Black Metallic

Default

thanks for the heads up; the faq's been fixed
The Deliverator is offline   Reply With Quote
Old 02-06-2006, 10:11 PM   #48
chrisarella
Scooby Specialist
 
Member#: 35584
Join Date: Apr 2003
Chapter/Region: South East
Location: www.chrisarella.com
Vehicle:
1965 FFR Roadster
Coyote + TR-6060

Default

^^^no problem, and thanks for the FAQ
chrisarella is offline   Reply With Quote
Old 03-11-2006, 03:57 PM   #49
NeedAWD
Scooby Newbie
 
Member#: 30831
Join Date: Dec 2002
Chapter/Region: SCIC
Location: East L.A.
Vehicle:
2004 WRX
Java Black Pearl

Default

Quote:
Originally Posted by HighPlainsDrifter
This is how I did my oil catch can on the Valve-cover side.
I hope this is a correct demo. I wrote it like a how-to, but I'm posting it here to let people tell me if its done right.

Supplies from Home Depot
Clamps
Connectors
Oil Catch

Walk-through
Step 1
Step 2
Step 3
Step 4
Step 5

I haven't yet tried to do the crankcase side.

nice and simple. I'm afraid to cut that pipe tho.
NeedAWD is offline   Reply With Quote
Old 03-13-2006, 12:43 AM   #50
dougkmcse
Scooby Newbie
 
Member#: 85938
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Bellingham Ma.
Vehicle:
2004 WRX
WRB

Default

How fast does the filter fill up. I bought one of the cheap ones from ebay. I then modified the can so i could install a piece of lawnmower air filter in it. then i installed it in front of the battery. oh this is in a 04 wrx. I tested and ther were no leaks. It seems to be working good. I have this installed on the valve cover vents. It is amazing what it catches. I don't know if it is the way i installed it by the battery, I get alot of water in it after along drive?
dougkmcse is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Catch can maybe reduce oil use? leighton1245 Factory 2.0L Turbo Powertrain 18 06-05-2010 06:38 PM
Oil catch can...or catch canS?? BoXinWRX Factory 2.0L Turbo Powertrain 3 07-28-2009 05:01 PM
Installed OBX catch can... (another catch can thread) txl146 Factory 2.0L Turbo Powertrain 5 09-10-2008 01:00 AM
WTT(HR): Greddy Oil Catch Can with Perrin Oil Catch Can scooby_wooby MAIC Private Classifieds 1 03-24-2008 09:01 PM
WTT: Cusco catch can for a perrin catch can sti charles Engine/Power/Exhaust 10 11-29-2007 01:04 AM


All times are GMT -4. The time now is 05:59 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.