exhaust smoke

[kiyakubuke]

at the track today I noticed some occasional puffs of white smoke coming from the exhaust under hard acceleration / high revs. other than that it runs and drives fine.
rings, seals maybe? anyone had anything similar?
thanks

[Steve Tinker]

Possibly air/oil seperator (AOS) failing. A quick test - with engine hot and idling, try removing the oil fill cap - if its difficult to remove (vacuum present) its the AOS.
Some track people also use a competition AOS, and deep sump kit to help combat oil surge in the sump and if you'r really keen an extra anti-surge oil pump in the cylinder heads + pressurised supplimentary oiling system.
Use the search function for more info or see Boxster Racing Forum section.

[kiyakubuke]

Originally Posted by Steve Tinker

Possibly air/oil seperator (AOS) failing. A quick test - with engine hot and idling, try removing the oil fill cap - if its difficult to remove (vacuum present) its the AOS.
Some track people also use a competition AOS, and deep sump kit to help combat oil surge in the sump and if you'r really keen an extra anti-surge oil pump in the cylinder heads + pressurised supplimentary oiling system.
Use the search function for more info or see Boxster Racing Forum section.

it wasn't very hard to remove the oil fill cap, but there was certainly a vacuum. could hear it, feel it when I put my palm over the hole. also, the rpms went up when I removed it, back down when I put it back on.