R32 Gtr - Blue/white Smoke

[Adam Kindness]

hello,

Looking for some extra insight here. I have a few ideas what the problem may be.

I use my R32 GTR on track with very firm suspension and slicks. Its running twin Garret GT2860R's.

I was getting reports of it smoking on track, and then witnessed it under acceleration. I have since tested the compression

150-158 accross all 6.

I have stripped the IC off and poured a fair but of pretty shitty looking oil out.

inlet

front turbo intake side

Put it all back together after a good clean up....no smoke.... couldnt see any smoke during test drive (up to temp), could not see any smoke at idle. Could not see any smoke (bar a wee black fuel puff) when pressing accelerator when stationary

I then took it out later on in the day with someone following behind the car. Car up to temp with some 3rd/4th gear pulls showed it putting out some blueish white smoke.

I've put my hand over the oil filler hole with the engine running, no real blowing.

Ive had the breather pipe (cam to cam & cam to inlet) off and they appeared mostly dry, certainly nothing like the IC pipework.

I'm running a Nismo oil pump and seeing 6bar on cold idle, and around 2.3'ish warm. I dont have an extra oil restictor in the turbo oil feeds.

So..... what do you think it could be?

Blown turbo seals (Turbos are aprox 2000mile old)

Excess oil gettign checked through the breather on track? (i thought that this would have cleared after empting the IC though)

I'm 80% sure it isnt rings, blow-by, or stem seals. The engine is newly rebuilt, 2000miles running 87mm forged Trust pistons.

[Slim Mat]

Do you have an oil-air separator?

[Adam Kindness]

Nope... Who Where What When?

I know they separate out air from the oil, but where do they plumb in, and how do they get oil back into the sump?

[Slim Mat]

An oil air separator, does pretty much what it sounds like, separates the oil from the Positive Crankcase Ventilation system.

Normally you would put it in the line before it goes back into the inlet manifold. You will need a bit of extra piping to locate the can and then to route it back to the inlet(it cannot vent to atmosphere as that is illegal!). The can could be made with a tap to drain it or a feed hose directly back to the sump with a one-way check valve.

The RB26's have a hose that comes out of the top, at the rear end of the right hand Cam cover, there is also a hose that connects the left cover. From there the hose leads back into the inlet manifold. You would want to put in a Catch Can there, before it goes back into the engine.

http://autospeed.drive.com.au/cms/article.html?&A=0338 Hope that helps

[Adam Kindness]

so oil catch tank and seperator are the same thing?

Plans wer eto fit one anyway...

So you think this is just due to track foces/heavy breathing? Why would it continue to smoke after the pipework was emptied of excess oil

[Slim Mat]

You said that it was good for a little while then when you went and did some heavy driving it started smoking again? Perhaps it's just pressurised the crankcase again and forces some more oil vapour into your intake?

Still, you need to figure out why it is blowing oil out, if that's the cause, or why there is smoke. White/blue smoke is usually oil in the combustion isn't it?

Edited June 30, 2007 by Slim Mat

[Adam Kindness]

yup... Its been found that the valve guides are worn. So i think its a combo of that and track work venting oil into the chambers