Quote:
Originally Posted by KillerBMotorsport
AVCS. IIRC it's ~5K RPMs (under load/WOT) where the cams transition. The oil feed that supplies AVCS draws more oil, and the system pressure drops some. All Subaru AVCS engines do this: EJ20/25, FA20/24. The only time pressure climbs fairly linear with RPM is when AVCS is deleted.
These pumps don't cavitate, at least not up to 10K RPMs. Aeration typically happens when the pump is bigger than the lubrication system is designed for... Like putting an oversized pump on a stock (or built to stock specs) block. That only pushes more oil through the bypass valve, eventually aerating.
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Ahhh, that makes total sense. Mine seems to do it about 5800 but my AVCS tables are a bit different.