I would follow Herb at Luhn Performance on the Vacuum Pump deal as we never used Vacuum Pumps at work on any engine programs (Dry Sumps Yes) and I have no experience with Vacuum Pumps.
Now I did investigate a camshaft driven Turbo Drain "Gear Pump" System that was installed on the Porsche Cayenne turbo vehicles. The Dual Turbos drained into two "Collection Boxes" that had a "suction" line from each box going to a internal camshaft driven scavenge pump. (Each box had three connections: Turbo Scavenge connection, Turbo Drain connection, and a vent line connection that went to a valve cover.
The reason for this system was the turbos were mounted very low on the engine and the oil would have to flow "uphill" which is not possible so they designed the scavenge pump system. Basically a production Dry Sump system for the Turbos.
Worked really well but $$$.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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