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Old 04-03-2004, 05:18 AM   #1
kaos200
Scooby Guru
 
Member#: 2692
Join Date: Oct 2000
Chapter/Region: SCIC
Location: SoCal
Default Trying out new oil catch line routing

Ok, im blowing out way too much oil at high boost. And I think its because of two main things...
1) there are no baffles on the sti valve covers inside under the hole like there are on the std. wrx valve covers.
2) the way I HAD my lines routed. they just dumped into the catch can, and the pcv was t'd in at the back of two of the lines (and not the third)

so now Im doing this...
the two main block holes, T into each other with a line from them to the firewall, where it meets the valve cover lines (which are travelling uphill to get here)

From there, they all t into a line that goes into the catch can, and the other hole in the catch can goes directly to the pcv. It is now a fully sealed system in which vaccum is being applied to all ports equally.

What do you think? Im going to try it anyways (as long as the local shop has the few fittings I need) So I guess Ill find out soon enough
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Old 04-03-2004, 06:45 PM   #2
wac
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Member#: 689
Join Date: Dec 1999
Chapter/Region: NESIC
Location: Lebanon, NH, USA
Vehicle:
2005 Outback 2.5 XT
Champagne Gold Opal

Default Re: Trying out new oil catch line routing

Quote:
Originally posted by kaos200
Ok, im blowing out way too much oil at high boost. And I think its because of two main things...
1) there are no baffles on the sti valve covers inside under the hole like there are on the std. wrx valve covers.
2) the way I HAD my lines routed. they just dumped into the catch can, and the pcv was t'd in at the back of two of the lines (and not the third)

so now Im doing this...
the two main block holes, T into each other with a line from them to the firewall, where it meets the valve cover lines (which are travelling uphill to get here)

From there, they all t into a line that goes into the catch can, and the other hole in the catch can goes directly to the pcv. It is now a fully sealed system in which vaccum is being applied to all ports equally.

What do you think? Im going to try it anyways (as long as the local shop has the few fittings I need) So I guess Ill find out soon enough
1. Where is your turbo oil return going?

2. Are all your tees "uphill" from all the valve covers even under hard cornering?

I studied the WRX and Legacy Turbo PCV lines, and realized that they both had "traps" to make sure that oil never gets a free "downhill" ride from the valve cover breathers to the PCV valve (or to the oil catch can) under hard cornering. The block holes don't seem to have this problem, so I left the rear one hooked up to the PCV valve and simply plugged the front hole.

Hope this helps,

-WaC
Wayne
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Old 04-04-2004, 04:09 AM   #3
kaos200
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Join Date: Oct 2000
Chapter/Region: SCIC
Location: SoCal
Default

1) it goes to the oil pan
2) they are now
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