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Blue Smoke Out Of Exhaust

SECURITY

By SECURITY,
in Engines & Forced Induction

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Jago Mentor

Jago

Posted
Posted

valve stem seals would normally be only on a cold start, from oil building up, correct me if im wrong.

Only way to check if it was the exhaust side of the turbo would be to pull it off i think. As exhaust would be hot enough to burn up any traces of oil.

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

yeah i knew i would've had to rip it off to check, im just a lazy bitch looking for an easy solution.

ill probably just disconnect my dump pipe and see how i go. do i check for shaft play of what?

Ryanrb25 Grand Master

Ryanrb25

Posted
Posted

turbo seals can blow smoke anytime, can do it on idle, can do it under power, can do it when you back off....all depends how bad it is. like i said previously, the front wheel is being pulled forwards which moves the rear wheel forwards too...excessive shaft play can change seal tolerances, plus oil pressure under changed seal tolerances can = oil leakage = smoke under load... seen it happen.

  • 2 weeks later...
SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

the problem has been pretty much figured out guys (pending new oil line).

what we think it may be is when i rebuilt my motor i rebuilt it with an N1 high volume oil pump. this pump pumps around 20-25% more oil as well as pressure at any given rpm compared to standard. so the turbo is receiving 20-25% more oil than is recommended and is getting forced past the oil ring.

im waiting on an oil line with a 4mm restrictor, so fingers crossed!

T04GTR Grand Master

T04GTR

Posted
Posted

basicly why the turbo seals do it under decel is theres no pressure in the exhaust manifold. this makes it easier to leak oil past them.

under boost theres usally almost double your intake pressure in the ex-manifold.

Ryanrb25 Grand Master

Ryanrb25

Posted
Posted

turbo wheel moves forward ever so slightly under boost letting that extra pressure escape past your seals into the exh housing.

what sort of turbo again? because the turbo should be able to put up with a little more pressure im sure of it. they aren't border line.

Cubes Grand Master

Cubes

Posted
Posted

A hard free rev?

What have you done with your oil restrictors?

How is your oil level? Its not over full?

A hard rev to 7000rpm in the first 3 gears with the std restrictors saw my cam covers start to fill, the oil then begins pushing out the breathers in to the turbo -> afm pipe and then it really plooms smoke out the rear. :S

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