well its time for another update...and this time it is not all good. you can see in the pic how massive the Grizzly impeller is, and it is made very well. You can also see that unfortunately the vanes are the wrong direction.
the biggest differance between these two impellers besides the obvious size differance is the weight. the Grizzley is probably around 3 times the weight of the harbor freight unit. so now to the bad news, the motor is just not up to the job of the extra weight and size of the impeller. It was drawing over 60 amps on startup with a max of 68! it would run for 5 seconds and start to accelerate but i couldnt keep it on long enough to see if the amperage would level out at an acceptable and stable range. this is running on a 20amp dedicated cicruit in my shop with nothing else running. i didnt feel comfortable switching to a 30amp circuit just to see if the amps would come down, i do have electrical experience being a contractor, and also called up my subcontractor electrician for advice and he advised against this idea as well. so now i am kinda stuck with this impeller as i just installed my weenie 10" impeller.
onto some good news though, i installed a bellmouth as did member "retired02" and i did notice a differance in performance. the amps also tell the same story, i was pulling 9.75 and am now pulling 12.1-12.5! quite an increase if you ask me.
i also altered the inlet of my unit, this might be part of the increase as well. i removed the metal inlet and switched to a plywood inlet on the squirel cage itself. nut the differance is i was able to round over the the edge with roundover bit, it basically made a bellmouth. pretty imteresting results if you ask me.
i'd be interested to see what a "stock" hf unit pulls in the amperage department with the stock 5" inlet and outlets since mine was upgraded to 6" up until the separator downsized to 5" just in case i ever needed to upgrade in the future.
btw i have a grizzly impeller for sale at a discount if anyone can do something with it, hehe