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New motor break-in

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#76 Racer36


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Posted 06 May 2017 - 03:18 PM

I finally got around to trying the Simple Green break in method that Matt Bruce so kindly shared with us. My somewhat ancient mind seemed to recall 15 seconds being the sweet spot... wrong! It worked extremely well but that motor is likely good for two races max.


I took the time to read the thread again and tried a second motor for 10 seconds. It is perfect! Nice contact pattern and super-clean comm.

Thanks, Matt!

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#77 NSwanberg


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Posted 07 May 2017 - 04:17 AM

I did an experiment on water break-in. I ran an open motor with higher RPM so the water turned to milky. The brushed were kaput in 30 seconds! I wondered a little what was happening. Then I came to the conclusion it was caused by cavitation in the water. The tiny bubbles formed do explode/implode and hammer the brushes into smithereens.


Understanding cavitation in centrifugal pumps leads me to believe you might be on to something here, however, the bubbles would have to form right in the brush/comm interface for the collapse to create the wear we sometimes see. I am just not sure that is going to happen there.


I am not a fan of water break-in for anything but I have tried it. I think the type of brush or its characteristics have a big influence on the wear during water break-in. I have had the same brand of brushes behave completely differently in the same set-up. When they disappeared in a matter of seconds I just figured that was not a set of brushes I wanted in the motor.

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#78 JustGeeDub


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Posted 15 May 2017 - 10:34 AM

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#79 Samiam


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Posted 15 May 2017 - 04:52 PM



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