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Old 02-10-2019, 12:21 PM   #1
STIdmod712
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Default Catch Can Causing oil burning?

Hey guys,
So I have a built 07 STI that is running a precision 6266 turbo. The engine has been running pretty good although it starts smoking once it warms up. It has a Mishimoto catch can installed but I recently got some head work done to it and the mechanic told me that the catch can setup was not adequate for the amount of boost it is running. He said the lines were too small and that the catch can was also to small. He specifically pointed out a couple lines that that T into one then to the can, he said the fittings were too small. Could this inadequate venting of crank pressure be what is causing the oil smoke? And if so what would be an adequate setup?
Thanks for the help.
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Old 02-10-2019, 12:24 PM   #2
viper_crazy
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Have you drained the can recently?
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Old 02-10-2019, 12:59 PM   #3
jamal
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This is happening under load? Is there still a pcv valve?

You could try disconnecting the catch can from the inlet to see if things change.
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Old 02-10-2019, 02:08 PM   #4
STIdmod712
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Quote:
Originally Posted by viper_crazy View Post
Have you drained the can recently?
Yes I have drained the can.
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Old 02-10-2019, 03:51 PM   #5
STIdmod712
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Quote:
Originally Posted by jamal View Post
This is happening under load? Is there still a pcv valve?

You could try disconnecting the catch can from the inlet to see if things change.
The PCV is gone actually.
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Old 02-10-2019, 04:50 PM   #6
KillerBMotorsport
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Size of the can doesn't mean anything as far as performance goes... but that is assuming it was designed for higher levels of performance. Two lines into one does sound restrictive, but that really depends on what kind of power you're making.

The other thing is... you're running a Precision turbo. They smoke more often than not.
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Old 02-10-2019, 06:38 PM   #7
binny
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if there is enough restriction through the catch can so there is pressure in the crankcase you will get a bunch of smoke

if you have vacuum in the crankcase that should assist oil draining from the turbo eliminating a smokey turbo (if it's in good nick and not hot side down oriented
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Old 02-11-2019, 02:24 PM   #8
Bamofo
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You need to be more specific on when its smoking. if it smokes when you get warm and at idle... the 6262 BB version smokes if you have too much oil pressure going into it and you may have to just get a restrictor at the top of the turbo. If you have a ton of blowby in the motor though and when you for instance take the oil filler off it blow drys your hair... then yeah. you need a bigger catch can setup to keep up with it. If you dont then like some others said you will pressurize the crankcase and... smoke. Let us know which it is.
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Old 02-11-2019, 06:25 PM   #9
motorbykemike
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i'm thinking that as it is a 6266 it's most likely a rotated setup




so first off ............


what rotated kit if so ?

maybe a couple pics ?

if the turbo is tilted back quite a bit , meaning the hot side is lower than the cold side , the turbine shaft is not or near level..................

smoke out the tailpipe is not uncommon

there are more than a few off the shelf rotated kits that I will not ever use on my car for this reason , or terribly convoluted sharp bends in the down pipe right out of the turbo , but that's a different story





and secondly .........


is the catch can vented to atmosphere or is it plumbed onto the turbo inlet
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