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Pressure is mandatory for hydrodynamics bearings (non roller turbos, mains and big end bearings, camshaft bearings), where flow is important for cooling.
Yes, flow reduction is a by product of increased pressure, that is exactly what i was trying to say. There is a point though were trying to increase pressure actually hinders flow so much there will be a huge pressure and flow loss after the place it happens (just like a roller bearing oil pressure limiter. This is wanted at a turbo, not at main and end bearings )
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