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castle mmm with 2200 kv motor

castle mmm with 2200 kv motor

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Old 05-16-2010, 09:57 AM
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Default castle mmm with 2200 kv motor

hi guys, hows your week-end?

what would a good operating temp for the motor be?
in a savage x

ran great until last time and after one lap throttle response was gone and buzzing noise from motor when asking for power and no little movement unless giving little amount of throttle.

i had just changed batteries and gearing three runs earlier, old set-up motor temp was always 120 or so buy the end of run time.
last good run with new set-up motor was 140 or so buy the end of run time

after the buzzing run i quickly unplugged and checked temps ...
just the motor was getting warm allready... 2 mins running.

i sent i letter to castle thursday but am dying to go that fast now that it is soo nice out.
any ideas ?
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Old 05-16-2010, 10:45 AM
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i try to keep all my brushless motors under 180F. but the cooler the better. what are your ambient temps and gearing?
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Old 05-16-2010, 11:04 AM
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it's usually cool but never seems to matter until it gets real hot in the summer.
i've got a 16 pinion 47 spur .
the change i made was the 39 tooth solid gear on the inside of the tranny.

in all it is similar to my budies with a flux 25 and 44 gears.
he was WAY faster than me when i had the 1 st gear.
but now three runs after putting in the sencond gear .... it's done.
i really beat this thing sensless , soo don't go feeling bad about a savage!
just want to fix it again ... to go pump up the ADRENALINE levels again!!!
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Old 05-16-2010, 11:18 AM
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lol. so is the motor still working?
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Old 05-16-2010, 11:32 AM
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working yes just barely.
but that was a few days ago now and i only heard the noise and saw the lack of performace on the part of the first lap and then one rigger pull in front of my self to see it just humm / buzz , straining kind of sound , not gear chatter like motor cogging.
it was working if i gave it just a bit of throttle to get back to myself.
but now i don't want to smoke another esc so i haven't done an more testing.
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Old 05-16-2010, 11:52 AM
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It may have gotten too hot and demagnetized the motor. A rebuild kit is only $25 dollars.
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Old 05-16-2010, 01:27 PM
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ha that would be nice for a change. lol
i 'm glad to hear it sounds like something somebody has heard of.
thanks for the info!!!
i've broken two other nitro trucks now triing to get my fix ... but instead i just have more to fix.
don't you just LOVE summer!
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