Hi folks, Not much has been said about this new motor but I thought I would tell about my findings. I am able to directly compare on the same vehicle, with an original Etek. As you know the "R" in Etek-R is for "replacement". So how does it do?
First off it bolts right up as the face and shaft are the same. The R is a bit longer so beware if you don't have space. Fortunately the motor can run in either direction with no issues. There is an internal fan that sucks through the end-bell in counter-clockwise mode and blows in the clockwise mode. I found I wanted to add an electric fan because the motor can get pretty hot (I am running it at 60 volts when the pack is fresh). That being said I have put about 45 miles on the motor and can say I really like it! The bigger more standard armature design is a better heatsink and there is no sill epoxy interface to trash like on the old axial motor. In my tests it did seem a bit less efficient and ate a few more amps over-all. Power feels the same but the "powerband" feels smoother and pulls well at all RPM's. I obtained the exact same top speed from "Deep Cycle" as before. I am very happy with the motor and with the fan I added (48v @.25 amps) it ran cool even with a hilly run on a 93 degree day. Having owned 4 of the original Etek, and the troubles I saw (though I was going over-spec), I can see why they discontinued them. I am glad they made this new model--a morph between what is good about the Etek clasic and the standard PM motors. Another good thing is it is still fairly light at around 30 lbs.
Jeff K. "Deep Cycle" http://www.evalbum.com/1617