Quote:
Originally Posted by NewArt
How does this happen?
p.s. It's not smoking badly. This is only the second time that it has happened.
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At speed, your cam covers have a lot of oil in them; add G=loads in corners and some of that liquid oil can get sucked into the AOS system (which has a vacuum line running to each cam cover). While the AOS can handle some level of liquid oil, it cannot deal with a flood, and more than normal vapor gets sucked into the intake.
Porsche had been aware of this for a long time, and actually produced an exotic and hyper expensive kit (read $10K+) for the heavily tracked 996's to help limit it. Amongst other things, the kit contains a "north west passage" oil recovery system which consists of additional oil scavenging pumps in the cylinder heads with lines to run the oil back to the sump. Unfortunately, this kit was never made available to fit in a Boxster.