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need help on timing on eletric motor's

need help on timing on eletric motor's

Old 10-02-2007, 07:07 AM
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Default need help on timing on eletric motor's

i have a epic 19 turn motor... my brushe's have half there .. and they won't work so i put new 1 on it it work like new... what the probelm? and should i more the timing thing on the motor? if so - or + and how much?
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Old 10-02-2007, 07:22 AM
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Are you sure the brushes were making contact on the comm?
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Old 10-02-2007, 07:31 AM
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Originally Posted by dalejrfan88
Are you sure the brushes were making contact on the comm?
yes
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Old 10-02-2007, 07:47 AM
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First are you sure you can adjust your timing? most 19t are fixed timing endbells, although there are some that you can adjust. Changing timing is not going to help a contact problem, an electric motor is a simple device. If it's not moving there isn't enough current to overcome the magnetic field of the can, so even if it's making contact it's not making enough, or something is preventing the power from getting from the lead to the comm. Try using a section of a dead brush (with the shunt removed) and put it behind your brush and the spring, this will give more tension to the brush and allow you to run it smaller. Some brush hoods also are not slotted enough on the spring side to allow the spring to push on the brush past a certain point.
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Old 10-02-2007, 10:53 AM
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yes i can adjust the timing....what is a shunt? thank's for your help...
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Old 10-02-2007, 11:30 AM
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here the motor.. http://www2.towerhobbies.com/cgi-bin...EXL1&P=ML#tech
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Old 10-02-2007, 11:47 AM
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you can see the timing from the picture
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Old 10-02-2007, 12:18 PM
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24 degrees is standard timing for stock motors but I usually set 19t or mods between 12 and 15 degrees advanced. Any more than that gets the motor hot too quickly and performance degrades when the brushes burn. You can tell if its too hot because the brushes turn blue and get brittle. They'll chip or chunk apart. They also scrape the comm badly at that point because the lubricant is burnt out of them.
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Old 10-02-2007, 12:18 PM
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I agree with Xray, there's probably not enough brush left for the spring to push against the comm. the slots in the side where the spring goes through aren't always cut all the way so the spring hits the stop when the brush is 1/2 gone. For bashing you can maybe get by with 1/2 brush but for racing I throw the brushes away when 25% is worn off so the spring pressure is consistent. The brush positive almost always wears faster than the negative.
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Old 10-03-2007, 05:49 AM
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Originally Posted by POUNDITRACING
you can see the timing from the picture
yea but that stock seting... ..
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Old 10-03-2007, 05:50 AM
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Originally Posted by RC Dad
24 degrees is standard timing for stock motors but I usually set 19t or mods between 12 and 15 degrees advanced. Any more than that gets the motor hot too quickly and performance degrades when the brushes burn. You can tell if its too hot because the brushes turn blue and get brittle. They'll chip or chunk apart. They also scrape the comm badly at that point because the lubricant is burnt out of them.
i will set it to 12 degree to start with.... how do you know when it is set right?
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Old 10-03-2007, 05:51 AM
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Originally Posted by RC Dad
I agree with Xray, there's probably not enough brush left for the spring to push against the comm. the slots in the side where the spring goes through aren't always cut all the way so the spring hits the stop when the brush is 1/2 gone. For bashing you can maybe get by with 1/2 brush but for racing I throw the brushes away when 25% is worn off so the spring pressure is consistent. The brush positive almost always wears faster than the negative.
should i slot it so i can get more out of it?
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Old 10-03-2007, 11:13 AM
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most 19t motors are around 12-15*. Don't think about it to much. If after your run the motor is cool and the gearing is correct then I would advance it a little but not worth it.
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Old 10-04-2007, 05:02 AM
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Originally Posted by POUNDITRACING
most 19t motors are around 12-15*. Don't think about it to much. If after your run the motor is cool and the gearing is correct then I would advance it a little but not worth it.
it is not runing cool... i tryed it last night at 24 dave g told me to run it at that... it it look slower then it was... so today right now im chargeing the battery pack at going to run it at like you said 12....
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Old 11-02-2007, 08:59 AM
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Originally Posted by MADMAN23
should i slot it so i can get more out of it?
I wouldn't. The stop is there for a reason - once the brush gets too short it will squirm in the brush hood and misalign itself or even hang up. Brushes are cheap - replace them often.
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