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Old 09-24-2010, 06:34 AM   #1
icev7
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Member#: 238805
Join Date: Feb 2010
Default Another crank case ventilation issue

I didn't find any thread about this issue I have, So here goes..

Thing is I'm just about finished with my build

Built ej207 with ej205 heads with 272 cams and running a rotated GT30R

The ej207 has 2 Vents, and the ej205 heads have only 1 vent each..

Also the original system uses the turbo inlet to create suction, but I don't have any inlet.

What is the best way to get simular suction as with the turbo inlet connection?

Some guys just close one Vent on the block and use the one that is also located in the ej205 blocks.. but then I also have to find a way to create suction somehow..

How have you guys cured this non turboinlet suction problem?
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Old 09-24-2010, 08:15 AM   #2
Bamofo
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Member#: 159743
Join Date: Sep 2007
Location: Plymouth Ma
Vehicle:
07 STI Limited
TurboMike Tuned 2.35

Default

I've been starting to use the element tuning Catch can setup for projects like that... it seems to fix all the ventalation issues i see. There are some threads showing alternative catch can setups that also work. I removed the pcv system on these cars too though.... that stock breather next to the turbo is just terrible. But thats just my opinion im sure there are many others. Good luck with your project
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Old 09-24-2010, 09:30 AM   #3
mostasteless
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Member#: 52631
Join Date: Jan 2004
Chapter/Region: Tri-State
Location: South Jersey
Vehicle:
2004 WRX
WRB

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Quote:
Originally Posted by icev7 View Post
I didn't find any thread about this issue I have, So here goes..

Thing is I'm just about finished with my build

Built ej207 with ej205 heads with 272 cams and running a rotated GT30R

The ej207 has 2 Vents, and the ej205 heads have only 1 vent each..

Also the original system uses the turbo inlet to create suction, but I don't have any inlet.

What is the best way to get simular suction as with the turbo inlet connection?

Some guys just close one Vent on the block and use the one that is also located in the ej205 blocks.. but then I also have to find a way to create suction somehow..

How have you guys cured this non turboinlet suction problem?
I know some people do it but I personally would not just plug the 2nd crankcase breather on the block. The breather is there to relieve excess pressure in the crankcase and although I do not know if plugging it up will cause problems down the road but its just not a risk I would be willing to take when it is cheap and easy to bring your valve covers to a welder and have them put a 2nd set of vents on them.

Also, if I understand the the PCV system correctly the suction created in the inlet is not what opens the PCV valve, its the pressure buildup in the crankcase. If I am correct about this I believe you could get away with simply using a valve cover breather like you see on older muscle cars. I would however use a catch can before the breather or things could get really messy.
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Old 09-24-2010, 01:22 PM   #4
rexworx
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Join Date: Dec 2005
Chapter/Region: Tri-State
Location: GTX3076R-276/272, GTX3071R
Vehicle:
MY05 GDA,MY04FXT6spd
2.5ltr,PPG,Front LSD,4.44

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There a few of use running hybrids such as the 2.5 turbo block. these have the second breather. We have been adding a second breather bung to each valve cover, then T it to the second block breather.

deff the best to do IMO. Even more important if you see high G's in autox track days etc. Oil slosh's to the outside head in the turn. with one breather on the valve cover it wants to suck up oil. the second breathers seems to equalize the Vacume/Pressure between the heads and the block.


http://forums.nasioc.com/forums/show....php?t=1977948


I welded mine like Sidewayz posted in post 5 in the link above. I used a different T then he does, but over all its the same.

I think its the best option for us.

I tried to T the second block breather into my catchcan but I was collecting alot of raw oil. Then I plugged it and got some added oil consumption. I also was worried about blowing oil past my cam and main seals.

Another option that one or two builders recomended is to connect the second block breather to the turbo oil drain return line. this is almost impossible if you not running a rotated kit because of room.

I also like the idea of the equalization of the heads.
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Old 10-05-2010, 02:43 PM   #5
Brou4164
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Join Date: May 2010
Location: Coppell, TX
Vehicle:
2008 LegacyGT spec.B
Grey

Default

Bump for exact solutions.

I've got 08 LGT spec. B with:
FP Green HTA (less than 2k miles, 3.0" inlet, supporting FP free-flow oil line)
Crawford Catch Can
Stock Block
Perrin Up/Mid/Down-Pipes
Perrin FMIC
TiAL 44mm Wastegate (Replaced same time as FPGreen HTA)
Perrin BOV
TGV deletes
PCV reinstalled (under guidance from Forced Performance 500mi ago)
Cat deletes
Royal Purple 15w40
AquaMist HFS-5
New spark plugs (installed under 1k miles ago)
Carbon clean service
Compression Leakdown test done: 0%

I'm losing 1qt every 300 miles. Smoke under heavy acceleration & then when I let off.

I've been advised that it's a crankcase pressure problem, but it hasn't changed with the reinstall of the PCV.

I don't know where else to look, I'm not getting any solutions.

Hope someone on here can give me guidance!
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Old 12-01-2010, 10:19 AM   #6
Brou4164
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Member#: 247046
Join Date: May 2010
Location: Coppell, TX
Vehicle:
2008 LegacyGT spec.B
Grey

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Bump for help
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Old 12-01-2010, 10:28 AM   #7
Homemade WRX
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Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

Quote:
Originally Posted by Brou4164 View Post
Bump for exact solutions.

I've got 08 LGT spec. B with:
FP Green HTA (less than 2k miles, 3.0" inlet, supporting FP free-flow oil line)
Crawford Catch Can
Stock Block
Perrin Up/Mid/Down-Pipes
Perrin FMIC
TiAL 44mm Wastegate (Replaced same time as FPGreen HTA)
Perrin BOV
TGV deletes
PCV reinstalled (under guidance from Forced Performance 500mi ago)
Cat deletes
Royal Purple 15w40
AquaMist HFS-5
New spark plugs (installed under 1k miles ago)
Carbon clean service
Compression Leakdown test done: 0%

I'm losing 1qt every 300 miles. Smoke under heavy acceleration & then when I let off.

I've been advised that it's a crankcase pressure problem, but it hasn't changed with the reinstall of the PCV.

I don't know where else to look, I'm not getting any solutions.

Hope someone on here can give me guidance!
That's some serious oil loss. I would have guess cracked ringland(s) and possibly oil seal on the turbine side of the turbo.

Are you sure the guy doing your leakdown test knew what he was doing or that he actually did the test? because 0% across all four cylinders from a stock block with mileage is rather bizarre/impressive be it I don't know the mileage nor how hard you've been on her.

The smoke could also be from leaky valve seals but at 1 qt/300 miles, I'm going to lean towards a no in that column.

On a side not, why such heavy weight oil for a stock motor?

I'd be curious to have you plug the catch can's drain line and see how quickly you collect oil.
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