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Old 03-06-2005, 12:15 PM   #1
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Default Serrated brushes

Hi Guy's and girls

Could someone please explain to me what are the advantages and dis-advantages of running serrated brushes on 27T motors.also for what purpose have some brushes got vertical or horizontal cuts in them. any information will be much appreciated

Many thanks
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Old 03-06-2005, 01:14 PM   #2
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found this on the EAmotors thread

full face lot`s of torque
hole less torque more revs
slot same as above also keeps the centre of the brush cooler longer

this is what EA does on some of his brushes which are serated, you should look through some of the threads for the hand tuned stock motors like EA or BRooD, if not im sure someone with way more knowledge than me will help you but i have found that a vertical slot in a serated brush will increase rpm but its may not always be the case

anyway hope this helps you a little

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Old 03-06-2005, 06:10 PM   #3
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I can help a little.

Serrations make more edges on the brush for the electricicty to flow around. It also makes for less braking effect by the brushes. I use a hole in the center. It works for me. Try them and see if your motor is truly faster. See if your comm stays cleaner longer, and if your brushes discolor faster or not. I think changing the amount of brush on the comm makes a difference in performance. FOR ME I find the hole makes the comm and brushes stay cleaner with less (or no) arc and burn marks on them when I rebuild the motor. Serrations wear off fast, some brushes work better with and some compounds without. Some are just a gimmic.
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Old 03-07-2005, 02:22 PM   #4
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Is there a tool for making the hole? Just drill it? Size?
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Old 03-07-2005, 05:10 PM   #5
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Try here John, it's part #3019.

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Old 03-07-2005, 06:12 PM   #6
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I just use the smallest bit in my index, Its probably 1/16". I hold the bursh inbetween my thumb and finger and turn the bit with a small pin vise (vice?) The hole ends up in the center or real close.

I have found since I use the hole the brushes look a whole lot better after racing. I think I get a little more power but do not have a dyno to measure it, only the seat of my pants.
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Old 03-07-2005, 08:35 PM   #7
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serrated brushes are for when your braking in your motor they help keep the comm and the brush face clean plus it helps form the brush smooth and easier during brake in theres no real advantage its just nice to not have to clean your comm and brushes a lot
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