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Soft vs. hard brushes

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#1 Dante


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Posted 08 June 2018 - 11:45 AM

I use a ProSlot PS-2102 Blueprinted motor with a 16D balanced arm and 20 Deg.

It always comes with soft brushes.

What is plus or minus if I install hard brushes?


Dante Cantalini

#2 wicked01


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Posted 08 June 2018 - 02:10 PM

The harder brush takes longer to break in but last longer. I usually always used the bigfoot brushes because they have less dust or mess on the endbell.

Casey Dill
" At this time in life I have more fun racing for last than years ago when I was racing for first "

#3 Fast Freddie

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Posted 08 June 2018 - 02:22 PM

I've just recently started using the Proslot G7 hard brush and I noticed it also keeps the comm. cleaner then a softer brush.  I would suggest that you radius the brush to reduce break-in time.  I use a JK Turtle and a diamond brush radius tool.

Fred Younkin

#4 idare2bdul


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Posted 09 June 2018 - 12:57 AM

So you expected a simple answer... 

Slot car motors are similar to race engines in that changing one thing might require or just encourage changing other things. How much internal resistance a brush has can be a factor. How much heat does it tolerate or generate with the spring tension you are using. Should you change spring tension? Are you gearing for torque or RPM? Is it a good batch of brushes or one of those that didn't come out quite right. Is this for racing or just for fun? Radiusing the brush is good advice for both types of brushes and a slow break in avoiding arcing is good too. If you like other types of break in, fine.

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#5 mark1



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Posted 09 June 2018 - 07:57 AM

hard brushes will last a while. I've seen the soft ones wear out quick. Usually in the middle of a race.

Mark Anderson

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