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Old 05-15-2009, 10:10 AM   #1
Odyknuck
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Member#: 192866
Join Date: Oct 2008
Location: Rome, Ohio
Vehicle:
2006 Impreza
Blue

Default White smoke and Turbo oil supply

I have allready done major searchs on the subject so please dont flame me. I recently started up my offroad 2.5 RST project engine. It has major white smoke coming out of the exhaust that would typically Indicate a blown head gasket. It does not do it all the time and when it does its worse at higher RPM. It is not your normal condensation smoke. The smoke does not smell like coolant or burning oil. I have done compression checks hot and cold and they are good with only a few pounds drop from cold to hot test for a motor with 100K miles on it. The motor runs good. There is no oil in the coolant and no coolant in the oil and no external leaks. Currently it has 440 Injectors in it with out my greddy connected so it would be running rich however I would expect to see black smoke if that helps. I discovered the Turbo was leaking a lot of oil into the exhaust and had to have it repaired (was a brand new center core). I reinstalled it and it still leaks a lot of oil. I Installed a petcock to reduce the flow to it and that helped however it still has a lot of oil going into the exhaust. The feed line is a 3an. I had this turbo on the 2332 VW motor wiith the same feed line and it did not puke oil out of it. Because the motor has 100K miles on it and with the Turbo I am debating on changing the Head Gaskets just to eliminate that possibilty. Pleas help!
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Old 05-15-2009, 07:56 PM   #2
front runner
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Chapter/Region: NWIC
Location: Seattle, Washington
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2001 legacy BH
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do a quick check of your oil return line. any restrictions could cause oil to leech out to the exhaust and intake side...it happened to me.
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Old 05-15-2009, 10:17 PM   #3
Odyknuck
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Blue

Default

I "T" the return into one of my dry sump scavenage lines so I wanted to be able to see how well it returned so I used 5/8" ID clear braided hose and the oil flows well. I am thinking that with the added Vaccumme of the pump I may be allowing a lot more oil flow and I am going to try a restrictor in the Supply line.
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Old 05-31-2009, 05:13 PM   #4
Odyknuck
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Location: Rome, Ohio
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2006 Impreza
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Default

Update,
Replaced both head gaskets and no more white smoke. No Indication of a blown head gasket however they cured the problem. I did go with the thicker DOHC to lower the compression a little.
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