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Old 09-05-2004, 05:11 PM   #1
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Default arcing in motor

I have a new p2k with 10 runs on it. I have used comm drops and cleaned the motor with power shot. Today it was shooting big arcs like from the back of the brush towards the comm. Anyway it has big arcs in the motor. Could someone tell me possibly what causes this and will it burn up some components if continues.
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Old 09-05-2004, 05:18 PM   #2
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Well, assuming nothing is defective....

Excessive Arching is usually caused by not enough spring tension....try increasing the tension of your springs. Most p2ks work well with trinity red on the positive and green on the negative...

Trinity springs in order of stiffness (stiffest first)


Now, if that doesn't work....more than likely something is defective in the motor, which could be a burnt winding, blown capacitor, etc....

Later EddieO
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Old 09-05-2004, 07:43 PM   #3
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I ran it again in the dark and the long arcs are few now when starting from stop. Running at full throttle, there is a green glow from I'm guessing where the brushes meet the comm. The motor ran very strong so I doubt its defective, and I'll pick up some brush springs soon.
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Old 09-05-2004, 11:40 PM   #4
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arcing is a result of having the brush pushed away from the comm due to many reasons.

some of the reasons are:

- springs are too soft for the motor *
- springs are wornout due to heat as a result spring tension is greatly reduced *
- comm is wornout and needs to be lathed
- comm was poorly lathed and as a result is "out of round"
- too much timming on motors (mod)

* most common

i have been using revolution V2 motors for some time now and its quite powerful and so linear due to the design of the endbell. since its diagonal to the comm arcing is greatly reduced.
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Old 09-06-2004, 12:32 AM   #5
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It probably has an out of round comm from the factory, before you ever run a new motor it's always a good idea to cut it and make sure it's perfectly round. I'd say get it cut, re-run it in at 2-3v for 3-5 minutes and it should be fine. Make sure it's very clean and you have put a drop of oil on each bushing.
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Old 09-06-2004, 02:23 AM   #6
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yeah, brush vibration will mess you up.
Chris Woods



TQ Racing Wire
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