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Old 12-22-2006, 07:46 AM
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Originally Posted by Dasupacat1
What should I start at rollout for a 12th on a med size track using a CO27 motor? Brushes? Springs?
Roll out between a 1.80-1.95 depending on amp draw of the motor. High amp draw closer to 1.80 and vice versa. Brushes F brushes with .010 off the trailing edge and a 2mm hole in the face. Green springs.

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Old 12-22-2006, 07:47 AM
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Originally Posted by akura2
same question..... 40x60 track, new carpet, Monster Stock Pro.... Spring? brushes? Rollout?


Thanks
Roll out 1.75-1.85 depending on amp draw...F brushes with .010 off the trailing edge and a 2mm hole in the face. Green springs.

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Old 12-22-2006, 07:47 AM
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Originally Posted by swopemike
5 to 12 amps. Usually 6 to 8 for normal motors, maybe 9. Sometimes you get 9-12 range. Top national drivers will get 12-13 on a good one. Just make sure it is well lubed, not binding, centered, etc., bushings ok, etc. so the amp draw is not faking you out due to friction. Also if you have one, check spring tension on the springs with a spring thing.

10A is probably a good motor if everything is good on it. But the motorcheckers we use are limited in usefulness anyway. Best way to check is lap times or maybe get someone to run it on a fancy motor dyno if you know anybody with one. But if it drives fast times on the track, keep it for the big heats and mains, you know it's a good one.
Mike thats the old school of thought...I don't run a motor if it's pulling more than 8 amps....usually that means it will over heat and fade. Sure it will be faster for 2 minutes but then you will see your lap times fall off. You can thank todays batteries for having to detune your motors LOL
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Old 12-22-2006, 08:32 PM
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Originally Posted by Bob Barry
Mike thats the old school of thought...I don't run a motor if it's pulling more than 8 amps....usually that means it will over heat and fade. Sure it will be faster for 2 minutes but then you will see your lap times fall off. You can thank todays batteries for having to detune your motors LOL
So what should I do to lower the amps of the motor? would changing the springs do it?
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Old 12-22-2006, 08:34 PM
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add a slot, cavity, file the trailing edge...basically reduce surface area.
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Old 12-23-2006, 05:01 AM
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trailing edge meaning the left or right side of brushes when looking at the endbell?
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Old 12-23-2006, 07:54 AM
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I know this has been asked only about 1 million times so.... I new to RC and I have a TC3 and a epic x and a co27 pro, monstor pro. our track is about 50 by 36. What type of gearing should I do ? Is there a site that list what your gear ratio should be per motor and track size ? So I know when I goto another track. Also I have a 48 pitch now, would it be better to switch to 64 pitch? There is just so much to learn, lol
Thanks for the help guys
Also are the Reedy or Orion stock motor any good?

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Old 12-23-2006, 08:03 PM
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Originally Posted by Dasupacat1
trailing edge meaning the left or right side of brushes when looking at the endbell?
Trailing edge is on the left side and you want to take off .001".
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Old 12-23-2006, 08:31 PM
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I think you mean .010"

Originally Posted by panther420
Trailing edge is on the left side and you want to take off .001".
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Old 12-23-2006, 08:33 PM
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how close are the 13.5 motors all around compared to the co27?
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Old 12-23-2006, 08:35 PM
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Originally Posted by J&L Johnson
how close are the 13.5 motors all around compared to the co27?
they are very close but you have to gear up (way up) they have alot of torque, I went up 4 teeth from the gearing for a CO27.
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Old 12-23-2006, 08:40 PM
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will there be any arguing between the 2? i just put 13.5's in my boys' cars and they run a sportsman class with the rest of the kids and i really don't want to make anyone mad.
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Old 12-23-2006, 08:41 PM
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Originally Posted by J&L Johnson
will there be any arguing between the 2? i just put 13.5's in my boys' cars and they run a sportsman class with the rest of the kids and i really don't want to make anyone mad.
in sportsman Im sure they wont mind at all
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Old 12-23-2006, 08:44 PM
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someone told me that i would never get the same braking with the brushless motors. Is there any truth to that?
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Old 12-23-2006, 08:44 PM
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Sportsman is generally a drag race to the next board, I doubt they would mind.

Unless your track has specific rules that is.
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