Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 10-27-2011, 05:39 PM   #76
RichyRich86
Scooby Newbie
 
Member#: 282175
Join Date: May 2011
Location: Sacramento CA
Vehicle:
2004 WRX
Red

Default

Quote:
Originally Posted by justooln2 View Post
I've posted this elsewhere. But here it is again.

I think this is a great picture for this (borrowed from slorice):


For 2.5 heads - it makes sense to hook up the new 2.5 block breather.
For 2.0 heads...
Good Reference, here is how my Hard Breather line ended up. 200 Miles on New Hybrid, with 272 Cams, No problems yet. still tuning.[/quote]

Any update on this setup? I have some issues with oil consumption from blow by and am thinking about trying this.
* Registered users of the site do not see these ads.
RichyRich86 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-28-2011, 11:46 AM   #77
bsholt21
Scooby Newbie
 
Member#: 109367
Join Date: Mar 2006
Chapter/Region: South East
Location: Nashville, TN
Vehicle:
2004 STi Wgn Hybrid
JBP

Default

I set mine up about 1k miles ago, and I've had 0 oil consumption since then. I redid all my lines with silicone ones, and I'll try to post some pics of my setup at some point.
bsholt21 is offline   Reply With Quote
Old 10-31-2011, 11:21 PM   #78
rdrz14
Scooby Newbie
 
Member#: 199004
Join Date: Jan 2009
Chapter/Region: Tri-State
Location: Selinsgrove, PA 17870
Vehicle:
04 WRX BuiltHybrid
Black & Gold

Default

Quote:
Originally Posted by RichyRich86

Good Reference, here is how my Hard Breather line ended up. 200 Miles on New Hybrid, with 272 Cams, No problems yet. still tuning.
Any update on this setup? I have some issues with oil consumption from blow by and am thinking about trying this.[/quote]

I have 550 miles on this setup and it works great so far!!
rdrz14 is offline   Reply With Quote
Old 11-01-2011, 05:42 PM   #79
RichyRich86
Scooby Newbie
 
Member#: 282175
Join Date: May 2011
Location: Sacramento CA
Vehicle:
2004 WRX
Red

Default

Quote:
Originally Posted by rdrz14 View Post
Any update on this setup? I have some issues with oil consumption from blow by and am thinking about trying this.
I have 550 miles on this setup and it works great so far!![/quote]

Thanks, good to know. I think i'm going to give it a go and see what happens.
RichyRich86 is offline   Reply With Quote
Old 11-02-2011, 02:58 AM   #80
N.A.S.
Scooby Newbie
 
Member#: 259182
Join Date: Sep 2010
Location: San Diego-North County
Vehicle:
2005 Legacy GT
Pearl White

Default

who else has tapped the valve covers, ive pmed a few people but no responses yet? I want to do this project ASAP but I have a question. what size drill tap do I need to use with the 5/8 Barb fitting? (its not 5/8)
N.A.S. is offline   Reply With Quote
Old 11-02-2011, 09:58 AM   #81
5lipstream
*** Banned ***
 
Member#: 124663
Join Date: Aug 2006
Chapter/Region: South East
Location: Nashville
Vehicle:
2003 AW WRX
2008 GG Evo X MR

Default

Quote:
Originally Posted by N.A.S. View Post
who else has tapped the valve covers, ive pmed a few people but no responses yet? I want to do this project ASAP but I have a question. what size drill tap do I need to use with the 5/8 Barb fitting? (its not 5/8)
I bought weld on -8 AN bungs and had a local guy TIG them up. Super easy.

You should be able to find the specs for the drill+tap for 5/8 NPT. Remember: A NPT tap is different than a regular tap. you need a NPT tap.
5lipstream is offline   Reply With Quote
Old 11-02-2011, 10:47 AM   #82
FuJi K
Scooby Guru
 
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default

The top breather on the 257/255 block will allow any blowby at the TOP of the crankcase to filter to the unbaffled port on the valve covers. If this cap is blocked, the crankcase will have to breath it through the rear oil separator, which connects to the restrictor valve/turbo inlet. The crankcase also breathes blowby through the oil drain passages from the head-to-block. The heads and crankcase will see the same pressure no matter what. The smaller port on the 257/255 valve covers are baffled. They go down, and back up. There is a little drain hole at the bottom of the baffle to let out any oil.

I tell the guys to just run a catch can at the rear chimney before going back into the turbo inlet and also the one that comes from the heads. Run TWO catch cans regardless if it's a 2.0L or a 2.5L. If not two then run a large baffled catch can/box and have both hoses going to the turbo inlet come to the baffled can/box and then back to the turbo inlet. If it where a single catch can I'd run it to the rear chimney.

If you do NOT wish to cap off the top breather on the 257/255 block, run it to a catch can or you can T it to the rear chimney hose, to a catch can and then back to the inlet. They BOTH are breathing from the crankcase. If no then just have fitting welded onto your 2.0L valve covers. NOTE: The fittings on the head that are for the crankcase vent are NOT baffled. The fittings that are on the heads, which goes to the turbo inlet are baffled.

Last edited by FuJi K; 11-02-2011 at 10:52 AM.
FuJi K is offline   Reply With Quote
Old 11-07-2011, 02:15 PM   #83
5lipstream
*** Banned ***
 
Member#: 124663
Join Date: Aug 2006
Chapter/Region: South East
Location: Nashville
Vehicle:
2003 AW WRX
2008 GG Evo X MR

Default

You do not need (or want) a catch can on the non-baffled block vent-to-valve cover ports. You only need one on the pcv-to-valve cover ports.
5lipstream is offline   Reply With Quote
Old 12-03-2011, 07:08 PM   #84
monte383sbc
Scooby Newbie
 
Member#: 298075
Join Date: Oct 2011
Location: Dirty jerzey
Vehicle:
2002 wrx
silver

Default

[quote=justooln2;34810898]I've posted this elsewhere. But here it is again.

I think this is a great picture for this (borrowed from slorice):



on this pic if the hoses from the valve cover that t- to the intake dont have a pcv wouldnt it force boost back into the engine and cause crankcase pressure again, iam having issue with crank pressure, when i get under boost and let out the throttle it pulls oil into the intake or its backing up into the turbo? by the way mine a built hybrid with a rotated presicion 5862, any ideas? and i do not have extra ports weled on to my valve coers just the stock ones...
monte383sbc is offline   Reply With Quote
Old 12-04-2011, 10:54 PM   #85
monte383sbc
Scooby Newbie
 
Member#: 298075
Join Date: Oct 2011
Location: Dirty jerzey
Vehicle:
2002 wrx
silver

Default

bump anyone ^
monte383sbc is offline   Reply With Quote
Old 12-05-2011, 05:42 PM   #86
slovak
Scooby Newbie
 
Member#: 168922
Join Date: Jan 2008
Chapter/Region: MWSOC
Location: Chi-town
Default

Quote:
Originally Posted by monte383sbc View Post
bump anyone ^
Did you delete your PVC? That can happen, but if you have a PCV once the pressure in the intake goes above Stochiometric and into boost the PCV valve will close and wont allow any blow by into the intake. You remove PCV valve and you got oil going to your intake uneder boost. If you go to page 1 and 2 they to show how the two systems are different between STi and WRX.

This thread is quiet useful and offers a lot helpful images on how to do things. By far the best one would be to cut into the passenger side valve cover and make a port there. Very good.

Also, people with STIs tend to run 2 AOS or 2 catch cans, one is for the heads, the other is for the block. If that is not your question then sorry for wasting your time.
slovak is offline   Reply With Quote
Old 12-05-2011, 06:02 PM   #87
monte383sbc
Scooby Newbie
 
Member#: 298075
Join Date: Oct 2011
Location: Dirty jerzey
Vehicle:
2002 wrx
silver

Default

Quote:
Originally Posted by slovak View Post
Did you delete your PVC? That can happen, but if you have a PCV once the pressure in the intake goes above Stochiometric and into boost the PCV valve will close and wont allow any blow by into the intake. You remove PCV valve and you got oil going to your intake uneder boost. If you go to page 1 and 2 they to show how the two systems are different between STi and WRX.

This thread is quiet useful and offers a lot helpful images on how to do things. By far the best one would be to cut into the passenger side valve cover and make a port there. Very good.

Also, people with STIs tend to run 2 AOS or 2 catch cans, one is for the heads, the other is for the block. If that is not your question then sorry for wasting your time.
ya i have a pcv in there and iam goin to get a grimmspeed AOS and run a catch can also, and goin to put two more breather vents on the valve cover and see how thats helps, ill get back to you guys and see how it worked, thanks
monte383sbc is offline   Reply With Quote
Old 12-09-2011, 10:16 PM   #88
justooln2
Scooby Newbie
 
Member#: 258482
Join Date: Sep 2010
Default

I'm still running my c-case vents just like pictured. I've gotten a good 1500 miles on the new build, the turbo seals went out and I was getting a little oil mixed with condensation. My catch can vent set up seems to be doing just fine. One other thing ive done, is to thread a nipple onto the can and ran a ball valve and drain hose for ease of draining, plus it adds to more overall volume of the can. (1/2" hose) It's has already came in handy. Just a little updated 2 cents.
justooln2 is offline   Reply With Quote
Old 12-20-2011, 03:25 PM   #89
ownnij
Scooby Specialist
 
Member#: 70459
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Las colinas, TX
Vehicle:
2002 AW Bugeye ej257
6spd, GT3076R, Alky & EWG

Default

glad to see people are still adding good information on this thread.
ownnij is offline   Reply With Quote
Old 12-23-2011, 01:39 PM   #90
Maxwell Power
Former Vendor
 
Member#: 190729
Join Date: Oct 2008
Chapter/Region: NWIC
Location: Marysville, WA
Default

Quote:
Originally Posted by rexworx View Post

Dom at maxwell sad I could block it but only if I am not having any blowbly, If I had blowby and capped it it could blow seals as well.
.
I believe there was a misunderstanding on that one.

Adding or removing the balance tube will not change total pressure in the crankcase. There are no vents on the tube and therefor there is no extra venting effect or any saving grace on cam seals.

I have NEVER seen a cam seal blow out from anything other than a head gasket failure. Not to say that it can't happen, but I've never seen it and I've seen a lot of motor failures.

the fuction of the balance tube is related to AVCS. That is why it is only on AVCS heads. The AVCS solenoids dump a lot of oil into the valve cover and this creates a higher load on the oil drainback ducts in the heads/block. Blowby moving up the ducts will slow oil drainback. Adding the balance tube prevents blowby from slowing oil drainback. Flow in this tube is insignificant and should NOT be vented to atmosphere or through a catch can. Venting this port to atmosphere will create flow in the tube and you WILL get lots of oil out that hose as the crank slings it right up into the port on the top of the block. This port is not made to handle flow; it is merely for pressure equalization.

Blocking this tube on non AVCS engines does nothing bad.

Using this tube on non AVCS engines can help will oil drainback and will not have a negative effect IF you run it just like factory and connect the valve covers to the block ONLY. venting to atmosphere or turbo inlets will only create a mess.

I didn't read the whole thread to be honest. So if this was already stated, then awesome!
Maxwell Power is offline   Reply With Quote
Old 01-10-2012, 02:35 PM   #91
5lipstream
*** Banned ***
 
Member#: 124663
Join Date: Aug 2006
Chapter/Region: South East
Location: Nashville
Vehicle:
2003 AW WRX
2008 GG Evo X MR

Default

I'm going this route:



Using a Peterson Fluid Systems VTA catch can (internally baffled with 6AN drain)



Custom work on valve covers

5lipstream is offline   Reply With Quote
Old 01-10-2012, 02:41 PM   #92
Maxwell Power
Former Vendor
 
Member#: 190729
Join Date: Oct 2008
Chapter/Region: NWIC
Location: Marysville, WA
Default

looks nice. I dig that can!

lol, you have a nice can!
Maxwell Power is offline   Reply With Quote
Old 01-10-2012, 03:11 PM   #93
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by Maxwell Power View Post
looks nice. I dig that can!

lol, you have a nice can!

I have NEVER seen a cam seal blow out from anything other than a head gasket failure. Not to say that it can't happen, but I've never seen it and I've seen a lot
of motor failures.

It IS a nice can.

That would be alot of blowby to blow a cam seal out. I've seen enough engines weep oil through the sealing surfaces, idle badly, etc to know this is one place where money is well spent.

I ended up with a Crawford AOS.

I'm not a big fan of having crankcase pressure fighting me in a engine that already struggles with ring seal.

S.
n2xlr8n is offline   Reply With Quote
Old 01-10-2012, 04:00 PM   #94
5lipstream
*** Banned ***
 
Member#: 124663
Join Date: Aug 2006
Chapter/Region: South East
Location: Nashville
Vehicle:
2003 AW WRX
2008 GG Evo X MR

Default

nevermind. I can't read
5lipstream is offline   Reply With Quote
Old 01-10-2012, 04:51 PM   #95
MaxMendez
Scooby Newbie
 
Member#: 108493
Join Date: Feb 2006
Location: MIAMI
Vehicle:
04 WRX
Hybrid RI GT30

Default

I started of my hybrid setup by capping the secondary crank case vent and was was getting a good amount of oil and vapor to the catch can.
Second time around I added extra ports on the valve covers and tee'd them into the crank case. PCV out and original valve cover vents are venter to a catch can. Im using clear tubes to the catch can and have seen light vapor and no oil. So far so good...

here is a pic:

The black junction block might look confusing but it works just like how i explained above. The two blue barb fittings feed the catch can...
MaxMendez is offline   Reply With Quote
Old 02-25-2012, 11:16 AM   #96
crashtke
Scooby Specialist
 
Member#: 120912
Join Date: Jul 2006
Chapter/Region: South East
Location: Atlanta, GA
Default

Using a new catch can that I just found...looks pretty cool and has been tested for two years on the makers personal 900hp car. I'll try to remember to follow up with this thread and let people know how it works. We are routing two hoses from valve covers to one port, main crankcase vent to the other port then returning the line back before the turbo (blow through maf on one and speed density on the other. It has a built in "crank bov" which is really just a check valve type assembly that will vent ANY pressure that builds up in the system. We are pretty excited to test it out. Here is a pic:

crashtke is offline   Reply With Quote
Old 02-27-2012, 11:06 AM   #97
5lipstream
*** Banned ***
 
Member#: 124663
Join Date: Aug 2006
Chapter/Region: South East
Location: Nashville
Vehicle:
2003 AW WRX
2008 GG Evo X MR

Default

Quote:
Originally Posted by 5lipstream
Using a Peterson Fluid Systems VTA catch can (internally baffled with 6AN drain)
Didn't like having to covert the -12AN fitting to two -8ANs so I contacted Peterson Fluid Systems about something a bit better. They are making me a can like what I have, but with a single -12 and double -8. This will eliminate about 4 feet of AN line, a 'Y' splitter, and a few fittings and hose ends.

They're backed up right now so it'll be a few weeks before I get it. I'll post pics.
5lipstream is offline   Reply With Quote
Old 02-27-2012, 04:38 PM   #98
jmessin1
Scooby Specialist
 
Member#: 154369
Join Date: Jul 2007
Chapter/Region: Tri-State
Vehicle:
2013 SWP WRX
kazoooooooo

Default

Oops, sorry to missquote you Dom.

Quote:
Originally Posted by Maxwell Power View Post
I believe there was a misunderstanding on that one.

Adding or removing the balance tube will not change total pressure in the crankcase. There are no vents on the tube and therefor there is no extra venting effect or any saving grace on cam seals.

I have NEVER seen a cam seal blow out from anything other than a head gasket failure. Not to say that it can't happen, but I've never seen it and I've seen a lot of motor failures.

the fuction of the balance tube is related to AVCS. That is why it is only on AVCS heads. The AVCS solenoids dump a lot of oil into the valve cover and this creates a higher load on the oil drainback ducts in the heads/block. Blowby moving up the ducts will slow oil drainback. Adding the balance tube prevents blowby from slowing oil drainback. Flow in this tube is insignificant and should NOT be vented to atmosphere or through a catch can. Venting this port to atmosphere will create flow in the tube and you WILL get lots of oil out that hose as the crank slings it right up into the port on the top of the block. This port is not made to handle flow; it is merely for pressure equalization.

Blocking this tube on non AVCS engines does nothing bad.

Using this tube on non AVCS engines can help will oil drainback and will not have a negative effect IF you run it just like factory and connect the valve covers to the block ONLY. venting to atmosphere or turbo inlets will only create a mess.

I didn't read the whole thread to be honest. So if this was already stated, then awesome!
jmessin1 is offline   Reply With Quote
Old 03-01-2012, 10:39 AM   #99
Jirv311
Scooby Newbie
 
Member#: 273528
Join Date: Feb 2011
Chapter/Region: RMIC
Location: Northern CO
Vehicle:
2002 Impreza WRX
Silver

Default

Quote:
Originally Posted by crashtke View Post
Using a new catch can that I just found...looks pretty cool and has been tested for two years on the makers personal 900hp car. I'll try to remember to follow up with this thread and let people know how it works. We are routing two hoses from valve covers to one port, main crankcase vent to the other port then returning the line back before the turbo (blow through maf on one and speed density on the other. It has a built in "crank bov" which is really just a check valve type assembly that will vent ANY pressure that builds up in the system. We are pretty excited to test it out. Here is a pic:

Looks pretty good. Where did you get it? Brand?
Jirv311 is offline   Reply With Quote
Old 03-01-2012, 12:46 PM   #100
biodude
Scooby Specialist
 
Member#: 271720
Join Date: Jan 2011
Chapter/Region: Tri-State
Location: NEPA
Default

I have AVCS heads on a EJ22 block which doesn't have the 2nd block breather. Right now I have the unbaffled valve cover breathers capped, should I connect them together with a balance hose? and if so do i need to still try to tie into the crankcase for pressure equalization?
biodude 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
PCV and Crankcase ventilation Question hustleshark206 Newbies & FAQs 4 08-20-2009 08:36 AM
Help me get a better grasp of crankcase ventilation gpatmac Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 11 12-06-2006 02:45 PM
hybrid crankcase ventilation sonic rx Built Motor Discussion 23 09-15-2006 09:27 PM
Crankcase Ventilation and Lateral G’s SloRice Built Motor Discussion 41 08-10-2006 04:43 PM
really need!! crankcase ventilation (blow by) valve Seeinstars Private 'Wanted' Classifieds 3 07-30-2005 06:51 AM

All times are GMT -4. The time now is 07:08 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.