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):vash: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! |
does it still leak now?
there's technically no seal, just a metal circlip, it's the pressure differentials that keep it from leaking. |
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 |
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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Originally Posted by Braineack
(Post 230698)
does it still leak now?
there's technically no seal, just a metal circlip, it's the pressure differentials that keep it from leaking. 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 Whats if its not the lack of restrictor causing the oiling but rather the pressurized crank case not letting oil drain properly? Serge |
I will have a catch can on both circuits.
I found the catch can from the compressor tools section in a home hardware store:)at 25$ each! |
plumb both the breather and pcv line into the dry sump tank and call it a day.
http://www.boostedmiata.com/technical/catch_can.jpg |
Originally Posted by Braineack
(Post 230776)
plumb both the breather and pcv line into the dry sump tank and call it a day.
http://www.boostedmiata.com/technical/catch_can.jpg |
Plum a line from the can directly to the intake tube after the filter. Done.
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there's about 1-2 ~hg of vacuum in boost...
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Originally Posted by sergei
(Post 230757)
This is why I will adress both: restrictor and pressurized crank. I will go whit that setup:http://beesandgoats.com/boostfaq/PCV_turbo_2fit.jpg
Serge |
some turboz need restrictors, especially with a -4an line.....
im sure that will solve the problem. |
most BB turbos need restrictors when running other than OEM feed line for example
they dont need as much oil as regular turbos... |
Originally Posted by Braineack
(Post 230820)
some turboz need restrictors, especially with a -4an line.....
im sure that will solve the problem. |
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: http://images3.hiboox.com/images/1208/zxme2owd.jpg http://images3.hiboox.com/images/1208/4glqabym.jpg But my turbo was pretty clean with no oil around the turbine and in the "exhaust of the wastegate": http://images3.hiboox.com/images/1208/wzhnngj5.jpg http://images3.hiboox.com/images/1208/ugu3all3.jpg 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:vash: 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) http://images3.hiboox.com/images/1208/fog03q7g.jpg What the f**k is goin' on?!?:bang: Any ideas, help appreciated. I think I will need to remove the head and make it cleaned... Serge |
Could that result from a pressurized crankcase?? The PVC I utilised was dead...
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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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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.... |
i've got a carbon build-up on the back of my car so feel fortunate :bigtu: i don't think that it will hurt the head too much other than being dirty :dunno:
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Seafoam it when you get everything reassembled. it may help.
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