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Turbo seal leakage

 
Old 03-20-2008, 09:12 AM
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Default Turbo seal leakage

Hi!
I need your opinion.
Last summer I let a "performance shop" install my GT28R turbo set up. I noticed that I have some oil leakage in my downpipe. I've check the oil feed and there were no oil restrictor in there (-4an)My pressure runs between 20 to 80 psi.
So I will put a 0.035 to 0.04 restrictor there. Thanks for that thread: https://www.miataturbo.net/forum/sho...r+turbo+1%2F16
My turbo drain tube is a 3/8 inches and it is not clogged

My question: If my seal has been leaking for couple months, does it mean it is dead or should it works fine after my "mods".?? I heard that they don't usually "break".

Thanks!

BTW I will plug the pcv port on the intake and run a "vaccum" at the pcv port on the valve cover going to the turbo inlet (threw a catch can)...I don't want a pressurized crankcase anymore!
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Old 03-20-2008, 09:15 AM
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does it still leak now?


there's technically no seal, just a metal circlip, it's the pressure differentials that keep it from leaking.
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Old 03-20-2008, 09:16 AM
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sounds like you already know the answer...

in addition to what you want to do, i would pop the housing off and clean all the oil residue and reassemble it and see if it still leaks, you may not need a new one
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Old 03-20-2008, 09:59 AM
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Whats if its not the lack of restrictor causing the oiling but rather the pressurized crank case not letting oil drain properly?
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Old 03-20-2008, 10:45 AM
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Originally Posted by Braineack View Post
does it still leak now?


there's technically no seal, just a metal circlip, it's the pressure differentials that keep it from leaking.
I haven't give it a try yet, I'm still working on it. I was asking the question to know if I should upgrade right now for a gt3071??

in addition to what you want to do, i would pop the housing off and clean all the oil residue and reassemble it and see if it still leaks, you may not need a new one
I will do!

Whats if its not the lack of restrictor causing the oiling but rather the pressurized crank case not letting oil drain properly?
This is why I will adress both: restrictor and pressurized crank. I will go whit that setup:

Serge
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Old 03-20-2008, 10:55 AM
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I will have a catch can on both circuits.
I found the catch can from the compressor tools section in a home hardware storeat 25$ each!
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Old 03-20-2008, 11:07 AM
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plumb both the breather and pcv line into the dry sump tank and call it a day.

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Old 03-20-2008, 11:21 AM
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Originally Posted by Braineack View Post
plumb both the breather and pcv line into the dry sump tank and call it a day.

Yes but there is no vacuum that way...
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Old 03-20-2008, 11:32 AM
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Plum a line from the can directly to the intake tube after the filter. Done.
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Old 03-20-2008, 11:40 AM
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there's about 1-2 ~hg of vacuum in boost...
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Old 03-20-2008, 12:10 PM
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Originally Posted by sergei View Post
This is why I will adress both: restrictor and pressurized crank. I will go whit that setup:

Serge
Why not try one at a time, preferably starting with the PCV. I have read many posts where people say running a restrictor is not always optimal. Dont know why, dont ask. Maybe clogging.
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Old 03-20-2008, 12:14 PM
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some turboz need restrictors, especially with a -4an line.....


im sure that will solve the problem.
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Old 03-20-2008, 12:32 PM
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most BB turbos need restrictors when running other than OEM feed line for example
they dont need as much oil as regular turbos...
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Old 03-20-2008, 12:48 PM
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Originally Posted by Braineack View Post
some turboz need restrictors, especially with a -4an line.....


im sure that will solve the problem.
I hope so, thanks for your support!
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Old 03-20-2008, 05:55 PM
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Default Update!

???I removed the turbo, ext. wg, exhaust manifold this afternoon and surprise!!!
At first I thought my turbo was leaking some oil and this is why there was a crust of carbon in my downpipe:



But my turbo was pretty clean with no oil around the turbine and in the "exhaust of the wastegate":



But look at the carbon builup at the exhaust side of the head?!?(3mm narrower than on the exhaust manifold (Begi log style))...no carbon buildup in the exhaust manifold, in the turbo...but a lot of carbon crust in the head and downpipe
I rebuild my engine last year, overbore it to a 1.9L, pauter rods, wiseco pistons, reroute, standalone SDS, 12.1 A/F at WOT, 14-15 on cruise, RC injectors, compression 180 all the board (cold, checked yesterday)


What the f**k is goin' on?!?
Any ideas, help appreciated. I think I will need to remove the head and make it cleaned...

Serge
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Old 03-20-2008, 06:02 PM
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Could that result from a pressurized crankcase?? The PVC I utilised was dead...
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Old 03-20-2008, 07:25 PM
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Yes. A pressurized crankcase will keep your rings from sealing, keep your oil from draining out of the turbo as well as some other things.
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Old 03-21-2008, 08:15 AM
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Can someone tells me if that carbon builup on the exhaust port is considered normal?
Thanks very much for your help! Very appreciated.

If I can avoid to remove the head for a cleanup....
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Old 03-21-2008, 10:35 AM
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i've got a carbon build-up on the back of my car so feel fortunate i don't think that it will hurt the head too much other than being dirty
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Old 03-21-2008, 01:58 PM
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Seafoam it when you get everything reassembled. it may help.
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