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Whatever there is, you could get nearly all of it by pulling the rubber seals out of the cartridge unit. Centaur might be particularly slow due to the double drive side bearing.
Seal drag is of the order of 0.01Nm, so at your average cadence of <5rad.s-1 there can't be more than 50mW to be had. Get your mum's kitchen weights out and measure how much you can balance on the crank above the pedal eye with the crank horizontal before it starts to move. 6g at 170mm would be 0.01Nm
gbj_tester
Any realistic wattage saving from switching from a sealed BB (Campag Centaur) to a traditional cup and cone BB (Sugino 75)?