Welcome to the North American Subaru Impreza Owners Club Thursday August 21, 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 > Normally Aspirated with bolt-on Forced Induction Powertrain

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 08-01-2003, 07:49 PM   #1
scoobyimprza
Scooby Guru
 
Member#: 24956
Join Date: Sep 2002
Chapter/Region: MAIC
Location: Littlestown PA
Vehicle:
1997 Impreza WRX
Steel Blue Mica

Default drilling valve cover for oil return

i hadnt heard of anyone doing this for their turbo, but my dad suggested it so we wouldnt have to remove the oil pan. he said it would work, but is it safe? what are my options?

Brent
scoobyimprza is offline   Reply With Quote
Old 08-01-2003, 09:06 PM   #2
Avenger
Scooby Specialist
 
Member#: 1234
Join Date: Apr 2000
Location: Vancouver, Canada
Vehicle:
2000

Default

You can do that only if the turbo sits higher than the valve cover, but most kits out there the turbo sits about the same level as the valve cover so the oil will not return properly.
Avenger is offline   Reply With Quote
Old 08-01-2003, 11:23 PM   #3
wac
Scooby Specialist
 
Member#: 689
Join Date: Dec 1999
Chapter/Region: NESIC
Location: Lebanon, NH, USA
Vehicle:
2005 Outback 2.5 XT
Champagne Gold Opal

Default

I had this setup on my car for two years, but the return oil pressurized the valve cover even though the turbo sat higher than the valve cover.

It was not an issue for daily driving, but the return oil pressure and volume sent excessive amounts of oil out of the valve cover breather vent and into the turbo and intercooler during long high-g turns on the track. The oil caused detonation and high oil consumption within a few fast laps on the track.

I recently got the valve cover return port blocked off and the oil return now goes into the oil pan.

-WaC
Wayne
wac is offline   Reply With Quote
Old 08-01-2003, 11:54 PM   #4
scoobyimprza
Scooby Guru
 
Member#: 24956
Join Date: Sep 2002
Chapter/Region: MAIC
Location: Littlestown PA
Vehicle:
1997 Impreza WRX
Steel Blue Mica

Default

could that be avoided with a catch can?
scoobyimprza is offline   Reply With Quote
Old 08-02-2003, 10:20 PM   #5
ChicksDigWagons
Scooby Specialist
 
Member#: 20508
Join Date: Jun 2002
Chapter/Region: MWSOC
Location: Ishpeming, MI
Vehicle:
1998 Red Wagon
New Turbo Project...

Default

The hardest part about removing the oil pan is getting to the bolts under the cross-member. Since you're doing a crossmember swap, thank you lucky stars and just stick with the oil pan!

An easy way to get the return to work is to use a bulkhead fitting. I used a 45* -6AN for mine, works great. A few things to note: Pay attention to the pan bolts when selecting a location for the drain. I didn't and the bolt underneath is a bit of a pain to get in. Make sure it clears the engine mount, mine does, but its a little closer than I would have liked...



Just drill a hole and bolt it on. See my location below, I would have liked to mount it another half-inch towards the front of the car (top of picture).





Good luck with the project!

-Brad Weingartner

Last edited by ChicksDigWagons; 08-02-2003 at 10:58 PM.
ChicksDigWagons is offline   Reply With Quote
Old 08-02-2003, 10:23 PM   #6
ChicksDigWagons
Scooby Specialist
 
Member#: 20508
Join Date: Jun 2002
Chapter/Region: MWSOC
Location: Ishpeming, MI
Vehicle:
1998 Red Wagon
New Turbo Project...

Default

Quote:
Originally posted by scoobyimprza
could that be avoided with a catch can?
Sure, but your catch can would fill up with oil, and oil in a catch can isn't a good as oil in your oil pan.
-Brad Weingartner
ChicksDigWagons is offline   Reply With Quote
Old 08-03-2003, 03:09 AM   #7
8Complex

Moderator
 
Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
Vehicle:
04 FXT
Red

Default

Well, the point was ade to me about the catch can that if you hook the catch can up with a line to the intake (pre-turbo) you can actually create a vacuum in the crankcase. It may not sound advantagous, but if your oil is backing up in the return line to the pan (like I believe mine is), then it will help out a lot. I am also working my way down through restrictor size for the oil feed to lower the flow some. I am down from the -4AN original diameter of .175" to .110" and I will soon be going down to a .063" restrictor as the .110" doesn't seem to be quite enough. I may try .093" first, but I really don't think that it'll be that big of a difference.
8Complex 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
valve cover leaking oil Keif Factory 2.5L Turbo Powertrain 10 09-11-2007 10:27 PM
FS MA: SOHC valve cover tapped for oil return, $50 OBO ! IllNastyImpreza 1993 - 2001 Impreza Specific Parts 4 07-11-2007 01:15 PM
SOHC valve cover tapped for oil return $50 OBO IllNastyImpreza Engine/Power/Exhaust 8 07-10-2007 01:14 AM
SOHC valve cover tapped for oil return $50 IllNastyImpreza NESIC Private Classifieds 1 05-13-2007 04:19 PM
Oil Pan, Valve covers for wrx 2.0 Subie-Gc8 Private 'Wanted' Classifieds 7 08-23-2006 08:01 AM


All times are GMT -4. The time now is 02:51 PM.


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.