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Old 08-17-2014, 11:03 PM   #1
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Default More turbo problems

I took the car out yesterday and gave it hell. When I was done it was pluming blue smoke when I got on it or it passed me when I came to a stop.

I had this problem about 500 miles ago. I disassembled the turbo, cleaned a lot of dried oil off and replaced the 2 piston ring seals.
It can't be the turbo. It has to be the drain, or excessive crankcase pressure.

When I get on it, oil seeps from somewhere up front. Presumably the front seal based on where the oil is.
I have both of my cam covers vented to a single breather tank with 5/8 lines.
The lines do Tee together before a single 5/8 hose enters the breather tank.

I know my oil pressure gets high at high rpms. (Probably north of 80 psi). However, my comp turbo has a restrictor hole cast right into the housing.
I've attached pics of my drain. The angle is almost 45 degrees, don't let the pics fool you. And it's -10
What am I doing wrong?



As you can see, the drain is well above the oil line, in the timing cover.
I'm stumped
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Old 08-18-2014, 05:39 AM   #2
 
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do a compression check.


good chance it isn't the turbo anymore.
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Old 08-18-2014, 05:43 AM   #3
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is the bung welded on the cover right near to a chain path?
those chains can whip around a large amount of air and oil vapor so I could figure it could be blowing air into the drain.

I would probably guess the cast in restrictor is not small enough.
it may look like it's a restrictor but it could just be the size they drilled the passage to if I recall you probably be looking for something that would fit a .045 drill bit or smaller... I know it might change depending on your pressure.
you should probably get rid of the T in the breather hose system
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Old 08-18-2014, 06:32 AM   #4
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do a compression check.


good chance it isn't the turbo anymore.
No offense but this is terrible advice
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Old 08-18-2014, 06:35 AM   #5
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is the bung welded on the cover right near to a chain path?
those chains can whip around a large amount of air and oil vapor so I could figure it could be blowing air into the drain.

I would probably guess the cast in restrictor is not small enough.
it may look like it's a restrictor but it could just be the size they drilled the passage to if I recall you probably be looking for something that would fit a .045 drill bit or smaller... I know it might change depending on your pressure.
you should probably get rid of the T in the breather hose system
I will measure the oil inlet hole but it's small. Very small.
I'll run 2 dedicated hoses for the breather tank
The bung is welded near a chain path indeed. I was contemplating installing a T into the drain line, with a piece of hose and a breather element attached. I would obviously run said hose somewhere above the turbo. I would have drained my oil to the oil pan when I built this but all of the piping was in the way.

Keep suggestions coming!
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Old 08-18-2014, 09:52 AM   #6
 
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No offense but this is terrible advice
no offense but not after all the trouble you have had with that car it isn't.


hahahahahahaha
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Old 08-18-2014, 09:57 AM   #7
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no offense but not after all the trouble you have had with that car it isn't.


hahahahahahaha
I haven't had much trouble at ll, considering I did not buy an off the shelf kit that has been tested hundreds of times prior.

Now that the bugs are worked out I have been beating on it more frequently, and this problem is becoming evident as a result.

Im calling comp when the open in an hour to get their opinion of the oil feed line.
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Old 08-18-2014, 10:18 AM   #8
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Sounds like the oil drain is backing up into the turbo to me. Pushing oil past the seals.
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Old 08-18-2014, 10:21 AM   #9
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you'd be surprised at how much air that chain moves around with it.... it's possible that the chain is blowing the oil back up into the turbo?
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Old 08-18-2014, 11:59 AM   #10
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Just got off the phone with Comp.
The oil inlet size is .040 as-is.
They told me any engines running more than 60psi at WOT requires an additional restrictor or it will almost definitely pump too much oil into the turbo.

They make a small inline filter with a .020" feed hole, which I bought for $25
Should be here Friday and solve the problem.
He told me I am definitely not the first person to call with this issue.....and the restrictor cures the problem 99% of the time.
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Old 08-18-2014, 05:00 PM   #11
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oil pressure > air flow from the chain.... NO? What you're suggesting seems nearly impossible.
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Old 08-18-2014, 06:09 PM   #12
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he had stated it was restricted. ...dude seems to know his shit. Figured it was likely the hole was too big.... I was spit balling after that.

yeah doesn't seem likely but he stated he had a restrictor I was just throwing out an observation I've made with chain drives with sensors/covers off.

it is a possibility that the chain is blowing oil and air at a cast in ledge near the hole and it's throwing oil into the opening. it's why you almost always see a baffle on the inside. Keep oil sloshing/windage from affecting oil return to the sump.
it's the main reason I've copied them and put baffles on the inside of all my returns.
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Old 08-18-2014, 07:19 PM   #13
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I will add a baffle next time the engine is apart. I appreciate the suggestion
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Old 08-18-2014, 07:38 PM   #14
 
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Good to see zack back on the board. < wipes mouth >
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Old 08-18-2014, 08:39 PM   #15
 
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BECAUSE TURBO CAR!!!!! That's why it's all screwed up.
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Old 08-18-2014, 09:10 PM   #16
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Quote:
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I will add a baffle next time the engine is apart. I appreciate the suggestion
Well shit... if the big dogs do eet why the hell shouldn't we...
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Old 08-18-2014, 11:03 PM   #17
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Quote:
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Well shit... if the big dogs do eet why the hell shouldn't we...
I agree it makes sense. Gotta break the engine before I go back into it though. Lol
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Old 08-19-2014, 02:30 PM   #18
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Quote:
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oil pressure > air flow from the chain.... NO? What you're suggesting seems nearly impossible.
Oil pressure is 0 psig in the pan unless you are pressurizing the crankcase... seems like it could be sorta possible.
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Old 08-19-2014, 02:32 PM   #19
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check PCV valve. My car smoked until I changed it. Then I just deleted it altogether.
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Old 08-19-2014, 02:59 PM   #20
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PCV valve? On a turbo car?

Um no...lol
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