8k miles plus, and I couldn't be happier. The windings look pristine, just like new.
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There's still a little of the carrier fluid left, but definitely needs topping off.
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The Statorade is right where I put it originally, between the magnets. If I look from the side. level with the magnets, I can see the Statorade fluid and particles sitting just above the plane of the magnets, so should have been providing some partial cooling even though it's running low.
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At this point, I need to make a decision on how much additional Statorade to add, since the space between the magnets is already filled, so I don't want to overfill it. I'm going to try 5 milliliters, and do a few temp tests during the week. If it's back to how it worked before, that will be good enough, and testing will give me new baseline data to use so I can add the heat sinks to see if I can detect an improvement.
Anyway, I'm just so happy, that I haven't even done any of my other maintenance checks yet. I still need to check my bearings, and bike maintenance stuff like lubing the freewheel since I have it off. To tell you the truth, I always procrastinate when it come to taking off my hub motor, but when I do it, it's really not that big a pain. I remove all of my batteries and bags before flipping the bike over, but even will that stuff, it was only 15 minutes to get to where the wheel was off and stator out.
Statistics-wise, I estimate that I've had the motor above 100C about 20 times, and above 90C maybe 40 (to many times to count in the high 80Cs). The highest temp reached 111C at a near stall; so nothing super abusive, but lots of hills. If, with the heat sinks, I can keep the motor in the mid-90C range during conditions where I would normally bump up against 100C, then I'll be happy.
EDIT: when I touched the Statorade between the magnets is was liquid and oily on my skin, so still flowing correctly. I decided to just add a few mils, just enough so it looked the same as the first time I added it (sitting about 1/32"-1/16"" higher than the magnets. I took the bike out just to see that it's working, about a block round trip. With the new Hookworms mounted, it feels a little scary due to the rounded profile which allows it to dive quickly into a turn. Once I get confident in the traction, this will be a positive. It feels like rolling resistance was cut in half with the slick treads and higher pressure, so it accelerates noticeably faster. In any case, it may be fun to do the road warrior thing for a while, and maybe try a few 0-30 runs to see what kind of improvement the tires really make.
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I love how the Statorade flows. I didn't even press the syringe at all, and just held the tip to the magnets and it sucked it out of the syringe. I did all of the magnets without even touching the plunger.