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Old 04-29-2002, 02:43 PM   #1
SPeeDSiN
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Default Looking for a part...Don't know what to call it

My brother has installed a t25 on his mazda p5.
Unfortunately, the way the oil lines are running, he is getting oil flow on both sides of the turbo, and out the exhaust.

We need a part that lets the oil out of the turbo JOIN the oil line going back into the sump. Right now its a t- connector so their is presurized oil going back up to the turbo. Essentially the oil flows are opposing each other! So what do you call a one way valve with a T or Y fitting on it?

Also, he didn't follow my advice on running the turbo's oil inline with everything else. IE oil flow from engine -> filter -> adapter turbo -> back to engine. He said that the turbo would be to much of a restriction in the flow of the oil. Therefore he decided to put a loop in his system. WHICH WAY IS RIGHT???

I thought the using a oil relocator kit, you would just run everything inline. It makes more sense. But if the turbo is going to cause all the oil to backup in the engine, I can see why running a loop would be better.

Thanks
Aaron Caudle
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Old 04-29-2002, 02:53 PM   #2
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my car runs pan -> filter -> engine -> turbo -> pan.

The turbo isn't much of a restriction in the system, it doesn't even need much in the way of oil pressure to function, tell him to hook it up inline, and have the oil return go straight to the oil pan.
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Old 04-29-2002, 02:56 PM   #3
SPeeDSiN
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thats what i thought too.
he said he hooked it up to an air compressor at 120psi said bairly any air at all came out of it.
I will have to call and tell him that. Don't the factory forced induction cars (most every manufacturer) run the system this way too?
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Old 04-29-2002, 03:00 PM   #4
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Quote:
Originally posted by SPeeDSiN
thats what i thought too.
he said he hooked it up to an air compressor at 120psi said bairly any air at all came out of it.
I will have to call and tell him that. Don't the factory forced induction cars (most every manufacturer) run the system this way too?
Yup, most cars run the turbo inline with the oil flow, and usually the oil after the turbo ends up straight in the pan.

Why the hell did he blow 120psi of air thru the oil bearing? Tell him to stop destroying his car. When the turbo is spinning, it's going to do a number on the oil in the chamber (super heat it, and break it down), you don't want that oil to cycle thru the rest of the engine. You just need enough oil pressure to get the oil into the shaft bearing, gravity will pull the oil out.
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Old 04-29-2002, 03:12 PM   #5
SPeeDSiN
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I guess what I am asking, (I don't really know all that much about it) is won't the oil be backed up behind the turbo and unable to complete its trip back to the oil pan, if the turbo is such a huge restriction? Wouldn't it be simliar to having 3" pipe flowing water, drop down to like 1" pipe?

BTW...thanks so much for your help!! I love i-club

Aaron
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Old 04-29-2002, 03:19 PM   #6
HndaTch627
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FWIW factory oil feed systems ALWAYS feed into an empty chamber such as an oil return galley or the back of the cylinder head(WRX) which is also the oil retun gally, it's just a gravity feed system...no pressure...run it back to the pan.

jeremy
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Old 04-29-2002, 03:20 PM   #7
Jewbaru
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The turbo isn't that much of a restriction. It will slow the oil flow a bit, but not so much where it'll destroy the engine. Tell you what, disconnect the oil return line from your turbo, and start the engine. Tell me if that's a slow flow of oil.
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Old 04-30-2002, 04:23 PM   #8
SPeeDSiN
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Ok, my brother contacted MachV where he got the t25 from. The guy there told him it sounds like his bearing are messed up. The shaft barely turns now. But it turned fine during the install.

So, is it possible having oil flowing on both the inlet and outlet side of the turbo, cause it to mess up the bearings?

Also, I don't wana harp on the same subject, but I can't seem to convince my brother of the proper way to do the oil lines. So for clarification's sake, leme describe his method vs the method i understand from jewbaru to be correct.

His: Use an adapter from the Oil Presure sensor to provide the oil to the turbo. After the turbo, the oil meets up with the oil coming from his oil filter relocator adapter that is on its way back to the pan through a t-fitting. Of course, with out a one way valve of some sort, the oil flows are going to oppose each other. Which is what happned! He has found an appropriate one way valve that will let the oil join the flow back to the engine. I call this a looped method, since the oil has different paths.

the way i understand described by jewbaru and others: use and adapter from the oil filter relocator to direct the flow into the turbo then back to the relocated oil filter, then back to pan. I call this inline method since the oil can only has one choice in the way to go.

So to end my debate with my brother, and to get his D@^^NeD car back on the road, which way is correct? Once the turbo is apart, how do you check for messed up bearings, seals etc? Are the messed up parts replacable with some sort of turbo repair kit?

Thanks so much
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Old 04-30-2002, 04:36 PM   #9
63Alpine
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My car runs a small line from the top of the engine where the oil pressure sensor is, into the turbo. There is a bigger line coming out of the turbo into the oil pan.

It is simple proven method and not something that needs to be reinvented.
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