The last time that I had my Z on a track I experimented with letting the engine spend more time near 6400 RPM than typical to avoid making and up shift and immeadiatly followed by a down shift for a corner.
After the session was over (30 min, 2.4mi 15 turns per lap) I opened my hood to find oil sprayed all over the engine compartment. Since a little oil can go a long way we are ony talking about an ounce or two of oil lost.
It appears the source is the filter breather that I have on my valve cover. So it appear there was positive pressure in the crank case. I checked the PCV valve. It is free and clear.
Important modification info may inculde
megasquirt II
Turbo oil pump
14 psi hot at idle
50 psi hot 2000RPM
~80 psi hot above 3000RPM
Head was ported and hot tanked within 5000 Mi
Head drains verified clear of abstruction
Mobil 1 full syntethic 10W-30
If more info on current build is need let me know.
I have a desire to modify this build to utilize a shift point between 7000-7500 RPM
It appears this problem wil get worse with RPM so I am very interested in a cause and solution to keep all of my oil in the engine.
Thanks,
Chris