Blue Smoke On Boost Only ?

[rasored]

After buying this GTR with new turbos and an inter cooler half full of oil I have replaced the head gasket and cleaned out the inter cooler . I fitted an N1 oil pump but I did not fit a restrictor for the oil channel to the head , would this `as i have read` cause more pressure in the camshaft area and there fore cause oil to pressure past valves and cause light blue/white smoke / or force more oil vapour into balance tube and turbo`s via the pipe work from the camshaft covers ?.

I compression tested engine and all were between 142psi and 162psi . No misfire is pressent !

MMHg ? on boost gauge is 320 on tick over and turbo`s are reconditioned steel new . when warm MMHg is 390 .

Anything over 0.5bar and there is a blue smoke screen from the exhaust , i think there is oil trace still left in induction from where the turbo seals went and the inter-cooler half filled with oil .// this was how i brought the GTR ! .

When driving normally it dose not smoke with all cam pipes connected , when cam to balance tube is blocked then engine smokes when on half throttle and decelerating ( like valve stem oil seals are gone ) there is also a regular ( every 3 seconds ) air pressure escaping noise coming from under the plenum area ( a high pitched puew noise ) happens on constant throttle and tick over . Could it be the Hi-Cas system as the light flickers on and off under 1.2bar , and the car wants to steer right , could be bushes on subframe i suppose .

Is it possible that standing turbos could degrade the seals and they are gone ?

Any ideas or suggestions `to the positive` would be most greatfully excepted , Thanks __________________

[Bsa]

Copy of comp test if possible. Oil could be pushing past your turbo.

[BOOZTJUNKEY]

Leaky valve stem seal I would think .

Also clean out ur piping and intercooler to be safe either way .

I doubt ur hicas is causing The smoke .

Check all ur vac lines on te plenum side is ur stick gague still working ?

It's common for the hoses to perish

[abr33]

How is your crankcase ventilation setup? the stock pcv yeah? sounds like your crankcase is pumping up and pushing oil out of turbo seals and/or the rings. Check lines for blockages

[nobby]

Mate that noise you mention is lack of vacume in pc system,check for blockages.

smoke, you may still have oil residue in fmic.

could even be a bit rich hence the smoke.

cat on way out.

crap au fuel.

any number of things.

Edited January 12, 2012 by nobby

[KiwiRS4T]

Why did you fit an N1 pump? Did pull the engine out just to do the head gasket or idid you do other work? Pity you didn't put a restrictor in the oil feed - a vent for the sump would have been good too. Do you have a catch can fitted? If not might be a good idea. Have you had a good long high speed drive - enough to get it really hot?

Compressions are high but a bit more variation than ideal.

[BOOZTJUNKEY]

^^^ I thought that with the compression aswell u really want them within 10 increments of eachother

[ClutchBurndout-:(]

sounds like rings.

turbo seals blow smoke all the time, not just on boost.

did you do the comp test WOT and hot? how long between the 142cyl and 162cyl?

if turbo seals went recently (but replaced) there may still be oil in the muffler.

Edited January 13, 2012 by ClutchBurndout-:(