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Old 06-28-2004, 10:20 PM   #16
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i thought on standard sized comms, the smaller it got, the faster the motor was due to less mass and more brush wrap. no?
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Old 06-28-2004, 10:26 PM   #17
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to a point yes.. but then it can get to smalll
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Old 06-29-2004, 12:07 AM   #18
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I cut after every race day and normally run brushes for 2 weeks of racing(8-10 runs). After 2 weeks they have usually discoloured and are junk(I flatten them out and use them for hood alignments). If you run your motor for too long you'll kill the performance of the motor and it will take a crap load of cuts to get get the comm back to round.
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Old 06-29-2004, 12:31 AM   #19
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Quote:
Originally posted by burbs
after to many runs the arcing on the cam causes it to discolor. thus requiring more passes on the lathe... meaning u take off more matirial then u should... the smaller the comm gets the slower the motor gets... anything under .270 in size is to small.. they look good on a turbo or a dyno but fail on the track...
Oh......

*kicks box with Monster-Stocks under the table*

I wish I had enough cash for a lathe
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Old 06-29-2004, 01:16 AM   #20
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Quote:
Originally posted by burbs
the smaller the comm gets the slower the motor gets... anything under .270 in size is to small.. they look good on a turbo or a dyno but fail on the track...
From what I've read in the past, motors gain rpm and loose torque when the comm gets smaller. Performance pretty much stays the same as long as you adjust your gearing to turn the gained rpm into torque(smaller pinion).
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Old 06-29-2004, 02:06 AM   #21
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as the comm gets smaller the motor will loose torque but gain in rpm. to regain some torque increase spring tention.
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Old 07-03-2004, 01:15 PM   #22
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Thanks for the help.......
I took a picture of the 4499's I'm talking about. I got them to seat, but are they too discolored? Next to it is a 766 brush that has been through 4 runs, on a trued comm.
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Old 07-03-2004, 05:57 PM   #23
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I've noticed with the dual shunt brushes, with more wire there is a greater chance of it getting hung on the edge of the hood and not letting the spring push the brush in further as it wears..
thus arcing more, getting hot faster and discoloring the brush like in the pic..

anyway just somthing to check...
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