I can also see the above mentioned roots electric, working, kinda...

BUT, a roots blower has rotors, which basically(being a loose explaination here...)thouch the side of the case, and as they spin, they create pressure(boost)...

I can only imagine the how this will affect the engine while its NOT running...

And as mentioned, you mention RPMs to spin that thing...
A street 6-71 blower, is usually run at a 15-5 % underdrive.. which isnt much slower than the motor turns..

And a started will not work well after more than 15-30 seconds of continuous cranking..

My 2 cents
Chase