Well even after watching the new video, I feel as though I've moved 25% closer to agreeance with his major stance that the square back to cover is the most relevant feature/ detraction of an after-market cover. The aeration is important, however when reviewing the original video doesn't seem to be any worse visually than the original clear cover.
And a keen eye will notice the same flow patterns develop on very similar points of the cover, flat backed or curved. You can notice the reluctor cutting a clear patch near the top middle, and two patches either side of the ring gear to the bottom where the oil picks up to be flung.
As for the "extra work" to me, it appears the additional volume creates a pocket of lube that helps to reduce impact in nearly the exact same way a pickup bed does with airflow over a cab. I think the principal of fluid Dynamics that prevents 90' turns in non vacuum chamber scenarios takes care of the "impact".
As far as I'm concerned, looking just at what happens at the cover may, but far from certainly,dictates what happens at the pinion anyhow. What we really need to see is the amount of lube present at the pinion bearings and the contact point between the ring gear and pinion, as well as oil temps when used in real scenarios. We would need some pretty specific equipment to test the previous, so we will see what he comes up with next as a "definite proof" or solution to the supposed problem , and how it may work.
I'm still open to hearing new information, but so far I'm not with him yet
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