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Old 01-30-2004, 02:33 PM   #1
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Default brush cutting

i am well aware that people cut off the trailing edge of there brushes on stock motors,to effectivley advance timming and acheive more rpm. i have never done it myself or seen other people actually do it. so i was wondering- i have some trinity slotted brushes-if i were to cut away the brush at the slot(basically cutting it in half) would that be over kill? what do people mean by "a little bit" off the trailing edge? how much is a little bit?
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Old 01-30-2004, 02:44 PM   #2
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25%

what you can also do to keep the face full is to cut it with an angle.... Basically it will "wrap around" further...

how can I draw it...

originally the brush is like this

_


cut it like this (be careful to the brush length though. use stiffer springs if needed)

/


Not sure it makes sense....

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Old 01-30-2004, 02:44 PM   #3
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crappy drawing
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Old 01-30-2004, 02:46 PM   #4
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That is definently overkill lol. The brush wouldn't even seat right. I just measured for you how much I take off the trailing edgeand how much putnam usually does on their motors. Normal width of the face of a laydown brush is somewhere around .190 in. I have cut about .015 in off the trailing edge of the face. So the overall brush face width is about .175 in wide. It's not much, but it does make a difference. Hope this helps you out.

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Old 01-30-2004, 02:50 PM   #5
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no, the drawing was fine, it made perfect sense. i am not even at the point where a couple of thousand rpms would make a difference either way(have to keep it off the walls first ) just curious by nature and like to tinker with things. thanks-sean
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