devarnishing brushes

GermanBeez Tue Feb 14, 2012 2:32 am

http://www.ebay.com/itm/COX-049-051-ENGINE-CYLINDER-DEVARNISHING-BRUSH-/330644256340?pt=Radio_Control_Parts_Accessories&hash=item4cfbeef654
this seems to me like its just the right tool to ruin your cylinder.
Does anyone have experience with those?

nitroairplane Tue Feb 14, 2012 3:08 am

After a while of running the right fuel cylinders develop a burnt castor varnish, this restricts performance so this brush removes that if used responsibly it is not coarse enough to ruin a cylinder but if you go at constantly and very roughly it would.
Indra

Kim Tue Feb 14, 2012 7:18 am

I've got a set for both .049/.051's and .020's, and I guess as Nitro said, they're safe...if used gently. The other way (which I'm coming to prefer) is to cut a notch in the end of a 3/8th dowel, and spin some .00 steel wool onto it like cotton candy. Oil it up, then run it into the cylinder from bottom to the the top, turning it the whole time. It should fit snugly, but not super-tight. After a couple passes, flush the whole cylinder really well with old fuel or whatever you normally use to clean them. Oil it again and go!

dankar04 Tue Feb 14, 2012 3:04 pm

Copper gun bore brush and Hoppe's #9 solvent. Say good bye to varnish ! .38cal/.45 will work fine and very cheap to buy. I'm cleaning my Colt .45 Peacemaker along side a couple TD .049's. I don't know whats better looking a shinny TD .010 or my Colt. Both looking fine.
Dan cheers

PV Pilot Tue Feb 14, 2012 3:49 pm

Yup, i use the 38/45 pistol brushes as well. A pass or two with the soft bronze and then the nylon for a finish up. Hoppes#9 solvent

John Goddard Wed Feb 15, 2012 3:56 am

At what point could one reasonably expect to have to do this?

**Cribbs74** Wed Feb 15, 2012 7:26 am

John Goddard wrote:At what point could one reasonably expect to have to do this?

It depends, how much fuel you put through it, what kind of fuel, temps etc. When performance is poor and cylinder/piston fit is tight etc.

I usually do it every time I break one down for cleaning. If you have an engine manual they all have a good explaination of the why and when.

Mike1484 Wed Feb 15, 2012 1:21 pm

I use a .38/.45 cal. bore brush (copper or brass) and Hoppes or kerosene. Glow fuel also works with the brush. Oil up after cleaning with some after run oil.

Mike1484

PV Pilot Wed Feb 15, 2012 1:31 pm

cribbs74 wrote:
John Goddard wrote:At what point could one reasonably expect to have to do this?

It depends, how much fuel you put through it, what kind of fuel, temps etc. When performance is poor and cylinder/piston fit is tight etc.

I usually do it every time I break one down for cleaning. If you have an engine manual they all have a good explaination of the why and when.

+1

You will start to see a dark margin or line near the exhaust port on the inside, then its about time to brush it out, and it's not super critical to remove every last spot of that you see. Just dont get crazy with the hard brushes because you can quickly ruin a cylinder. Use PLENTY of solvent,,make a mess, have it dripping off the parts as you brush . A couple passes, then inspect, repeat if you feel necessary, use good judgement, ect.

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