Sleeve Resizer

[ClayGlover]

Check out this guy's sleeve resizing tool on Ebay. Says he can custom make them for different motors-

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...3191585310&rd=1

 

[Hap Mulvany]

It is the piston that wears not the sleeve.

 

[Preston_Hall]

Due to the actual dimensions (very small measurements) being corrected I would think that this would generally work fine. There was some talk over this before and it was a good discussion. From what I remember this type of tool would tend to make the sleeve out-of-round. Also when you do this you create material stresses. It was mentioned as to how these stresses were relieved. There is a resizing service on Ebay that sounds more promising.

It is the piston that wears not the sleeve.

I don't know what weres the most but the sleeve wears as well. Either way this process should correct the fit. Who knows how it affects the taper and if it matters. I plan on trying the resizing service for myself. You can't loose much.

 

[topfuel443]

Guys, I get my sleeves pinched all the time for my 1/8 buggies. I have tried this tool before and managed to screw up a .12 sleeve. There is an art to it but it does work. I send mine off to OSRocket. hes on ebay also. It wold be much easier to send it to him for 20 bucks and know that its right. Ive gotten 8 MORE gallons through a 21 before after running 8 through it initially. I usually replace the rod, but thats about it.

~James

 

[Grimracer]

Its works and works quite well.

We are tooling up to start selling the tools..

To begin we have the K+B 21 tools just about done. and are going to get some feedback at the race this weekend.

I should post some pics.. Looks like they are going to be in the 32 to 35 dollar each range.

Grim

 

[Rules]

The tool should work fine with a bit of experience on scored junkers. You only need to reduce the bore by .0002 - .0006 to refit the piston. Anything near .001 in the critical "fit" area might kill the sleeve with the original piston. In a few months when several dozen of the tools are out there you should be able to find a buddy that will do the refit for you for $5.00. I would personally use a sizing mandrel in addition to the ring. Insert the oiled mandrel, then resize. Brass is "springy" so the mandrel might prevent an oversqueeze. It could be real easy to go past the correct size and end up too tight. Use white transistor mounting grease on all your engines and definately with this process to restore the heat transfer between the sleeve and the case. Get it at Radio Shack, but only the white stuff will work, not the clear. Wash the case and the sleeve with lacquer thinner and apply the grease to both parts, then assemble, wipe away the excess. Been doing it for years, works great !!! Have fun. John in Huntsville

 

[ClayGlover]

Website says he does all motors .12 thru .26 . He emailed me that for larger displacements he would make the proper size tool for purchase, but does not provide the resizing service for the larger motors due to "time constraints"-

http://www.acsu.buffalo.edu/~jfroth/pinch/

 

[Ron Olson]

The latest issue of RC Driver has an article on the resizer.