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Cox Engine of The Month
August-2024
balogh's
![](https://i.servimg.com/u/f95/15/46/86/41/1_balo14.jpg)
"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
balogh's
![](https://i.servimg.com/u/f95/15/46/86/41/1_balo14.jpg)
"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Why are wire brushes bad?
Page 1 of 1
Why are wire brushes bad?
I have seen many people mention not to use wire brushes to clean out their engines, why is this the case? Do they scratch the soft aluminum, or is there another reason?
7Mile- Moderate Poster
- Posts : 18
Join date : 2019-08-01
Re: Why are wire brushes bad?
It all depends on bristle metal, wire gauge and the metal being brushed. A special warning is in order to not use any kind of metal bristle on anodized surfaces-- i.e. the inside surface of the crankshaft bearing portion of a Bee crankcase.
ticomareado- Account Under Review
- Posts : 1089
Join date : 2013-10-03
Location : NC
Re: Why are wire brushes bad?
I thought it was due to the tight tolerance that Cox was able to maintain during manufacturing that a “wire brush” cleaning of the cylinder could cause a loss of compression.
The best info I can find short term is from Paul G’s mouse racing info:
“Lastly, it is very important to keep carbon varnish off the piston and especially the cylinder walls. #000 steel wool or medium grade Scotchbrite wrapped around a small dowel wet with solvent easily removes all the carbon. This procedure takes only a minute, but really should be done before every contest to ensure peak performance. *NOTE: the Davis de- varnishing brush can also be used but be careful not to get carried away. Bob Davis recommends only a few strokes as his brush actually hones the cylinder. Used vigorously and too much can cause 'over-honing' making the piston fit too loose. Do be aware of this possibility.”
The best info I can find short term is from Paul G’s mouse racing info:
“Lastly, it is very important to keep carbon varnish off the piston and especially the cylinder walls. #000 steel wool or medium grade Scotchbrite wrapped around a small dowel wet with solvent easily removes all the carbon. This procedure takes only a minute, but really should be done before every contest to ensure peak performance. *NOTE: the Davis de- varnishing brush can also be used but be careful not to get carried away. Bob Davis recommends only a few strokes as his brush actually hones the cylinder. Used vigorously and too much can cause 'over-honing' making the piston fit too loose. Do be aware of this possibility.”
Marleysky- Top Poster
Posts : 3618
Join date : 2014-09-28
Age : 71
Location : Grand Rapids, MI
Re: Why are wire brushes bad?
The wire brush leaves fine scratches on the soft steel cylinder wall which may help better retain the oil to lubricate and seal.. but if you push and pull the brush in and out then the longitudinal scratches will weaken the compression seal. If you apply the brush by "screwing" it in the cylinder by a circular motion the tangential scratches will not impact compression unless you overdo it.
balogh- Top Poster
Posts : 4852
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
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» Cleaning brushes
» devarnishing brushes
» Cox .049 / .051 Cylinder devarnishing brushes now available
» Cleaning tiny parts/orifices
» [solved]most Efficent Glowhead Clip for Norvel Engine
» devarnishing brushes
» Cox .049 / .051 Cylinder devarnishing brushes now available
» Cleaning tiny parts/orifices
» [solved]most Efficent Glowhead Clip for Norvel Engine
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