I went up very very very slowly on the throttle on glass smooth water. When it got near 4500 rpm the pressure drops. It also drops punching the throttle to come up on plane. When the rpm's are up there the pressure drops.
With the windage tray in this pan I don't think the oil is being sucked up from the crank on plane cruising 4500 rpms do you? The stock pan had no problem at that rpm so I can't see why this one would.
I'm at my wits end. I'm starting to lean towards air being sucked in through the tube, maybe the gasket end has a flaw??
The oil pan sloshing makes complete sense but in this case we have been nearly alone on a glass smooth lake. It does the pressure drop back ANYTIME the rpms get up there.
I'm not saying it does it exactly the same rpm every time but just that it is so near 45 to 4600 you can't really tell the differance on the tach.

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