turbo question

how much oil does a turbo with a bad seal burn. miles per qt.

 

[HHIVR4]

Theres no definate answer to that.Are you having smoking issues?

 

[turbowop]

Usually when oil is pouring out the seals for whatever reason, it should be measured in quarts per mile.

 

yes. my buddy said he notice when i shift and when i'm on idle for awhile then rev., i get smoke. i'm burning lots of oil. no leak. just have 5k on new engine and been burning oil since rebuild. car pulls really good. i'm hoping my rings seated properly. i'm hoping it's the turbo.

 

[turbowop]

That doesn't sound like a blown turbo, sorry.

 

[belize1334]

The smoking could also be caused by a rich condition during shifting and dip-in. I assume that you're recirculating the BOV? Have you done a boost leak test?

 

[turbofonz]

Wouldn't that be valve seals?

 

[turbowop]

That's what I was thinking, but he said the motor is pretty fresh. Maybe something was done wrong though.

 

[belize1334]

Yeah, I figured since it's a new motor it shouldn't be valves (unless it's just a new block w/ the old head). Also, I could be wrong but I wouldn't figure that valves would smoke during shifts. I always thought that was more of a start-up thing.

 

Was the motor a full rebuilt including the head & lower end?

 

[turbowop]

Quoting belize1334:
Yeah, I figured since it's a new motor it shouldn't be valves (unless it's just a new block w/ the old head). Also, I could be wrong but I wouldn't figure that valves would smoke during shifts. I always thought that was more of a start-up thing.



It's more of a vacuum thing than a start-up thing. The seals sit above the floor of the head, so oil doesn't really seep past the seals when the car isn't running. Under vacuum while oil is being slung around in the head, it gets sucked into the combustion chambers. That is why cars with bad valve seals smoke so much after sitting at a stoplight.

 

[HHIVR4]

You could do a near operating temp compression test to check for blow by that will tell you if the rings are seated proper or you have a cylinder issue.
If the head wasnt done then its most likely valve stem seals as said above..
Pull the intake pipe off the turbo and check it for shaft play and look for oil getting into the intake from bad seals.If you let it sit a bit then there should be oil sitting in the turbo if the seals are bad.

 

The OP said new motor but never really specified if the head was new as well. A lot of people ref to a new lower end as a new motor. As for what he posted I'd say valve seals as well.

 

[mikus]

+1 to the lot. Bottom end only gets called "new motor" all the time, and you should diagnose... good luck hope it's turbo

 

just check the turbo, very very little play on shaft. very little oil sweat on the intake side and intercoler side of the turbo. does this has to be completely dry to the touch on both side?

 

[turbowop]

No. Due to the way Mitsu designed the crankcase vent, a little bit of oil sneaks by and coats the surfaces with a thin film. It's normal.

 

[prove_it]

Did you put forged pistons in it? Forged pistons tend to burn a bit of oil.