After lubing and assembing the Rajay, with the exhaust housing installed to compress the turbine shield and spring ring, I tried to spin the turbine shaft. It doesn't take any effort to spin but it doesn't keep spinning either... just comes to a stop. I agree it could make a difference when it's lubed and running but ball bearings still have to make a significant difference, and that's any time you increase throttle. I doubt I'll keep the Rajay and will likely replace it next winter/spring. The only reason I decided to use it this summer, other than money that is, is to see what I think after changing the F compressor to an E compressor. Good luck... hope it exceeds your expectations.