I think they are run dry in certain applications but I don't know if that includes automotive. I read somewhere that they use a lower viscosity lubricant.
I just started looking into this yesterday so I'm pretty ignorant on the specifics. I know they are in heavy use in racing so you know there is some gain to be had.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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