First most RayAracing resizing method is with tooling designed just to resize sleeve cylinders. An alloy reconstruction process that reforms the sleeve alloys using internal and external control. state of the art equipment I spent 1 full year developing between late 2001-2002, that which has made it possible for many engine moders / clubs / hobby shops to resize rc nitro engine piston & sleeve sets. The guys out there resizing with success, are tooled by RayAracing.

You see in a previous post mentioned by Brian K contributing writer of XRC magazine he did an article on both my reconditioning-resizing work, and with tooling itself at hand to inspect and use himself. Thank you again BK and XRC magazine! Anytime you guys are ready to run another article on my reconditioning-resizing work as it is now in 2009 please feel free to call on me.

Finally, After inspecting thousands of piston and sleeve sets before servicing we have found that 9 of 10 sets are with from minor to moderately damaged surface finish conditions. As you guys know the sealing capabilities these 2 cycle ringless piston engines in both power cycle and mixing cycle are established (fit & finish) both cylinder wall to piston clearance/mated surfaces. Pinching is only half the job with renewing engine life. With that said we at RayAracing improve surface finish conditions before we resize. It simply provides better results than any other process/method used today.

Racers and hobbyists are encouraged to email me, text me with any questions. Please donot personal message me as I do not get a chance to sign on here as often as I'ed like.

Kind regards,

RayA
http://www.rayaracing.com/

ray's method is second to none..period.
as far as i am concerned and speaking from experience i will let no one else touch my engine internals.

Thanks helivaguy,
The group orders (6) and more sets keepin me busy more this year than past 7 years.improving poor surface finish conditions takes time.

RayA

a few guys at my track use a pipe cutter to circle around the oil rings on the piston. this gives increasedpinch when the engine is a litle tired.

all you need to do is pass the pipe cutter round cutting disk around the rings very lightly to increase compression. Suitable to do on an old engine that is a little tired, and needs some extra oomph.

you can get a pipe cutter from any hardware store;

Thanks for the pic. I will post it on my website.
RayA

Just paid 9.99 plus 7.50 shipping for one of these stupid clamps last week for a trx 2.5 sleeve real upset about that now but what was I thikning I should know better than that. Anyways now that I read here I have cancelled the order I had for a 3.3 sleeve CLAMP not pincher like this liar states and I reported his item to ebay as this kind of crap doesnt need to go on and to take advantage of the uninformed like myself.

Anyways after reading here I will be sending my sleeves and pistons to either rayaracing or osrocketracing thanks for the info.
I did see that I could buy a setup from rayaracing and I may look into that but for the 450-500 it will cost I could buy alot of traxxas 3.3 engines for that :P though I did more so want to learn how to do it for myself as part of the hobby and plus being that I want to take up machining as I grew up with my dad owning a bridgeport and a clausing lathe in the basement I would like to get back into machining like I did a little of when I was a kid.

I am currentle experimenting with tools like these:



For less than 100 dollar you have the holder and the right fitting tool and it works.

Roelof, can you demonstrate it to me next national?

No problem

Roelof,
I suppose that's what you experimenting with

The most important part is the brass ring, which is conical on inside by 0,02mm.
It's an nice setup, that can be used at the track as well, as long as a vice is available to hold it.

Oh, and sorry for the bad quality of the pics.

Thanx for the tip.

At this moment I am pinching the whole sleeve without a ring. Is does take some forces but when keeping it under pressure for a few minutes I do notice a difference.

Most .21 sleeves are 19.5mm and I have a clamp of 20mm. I have seen the .12 sleeves are 17mm for which I can make a ring.

IMHO, the brass ring is absolutely necessary to get a good result.
We tried to use the clamp by itself and it never worked.

The brass ring gives you the shape that you want, that why it is conical, just as the sleeve.

very interesting

that is one good tool u have there. i also experimented with a normal hose clamp. got half of my original pinch back and it performs well.

I have made my own pinching tool that works very well.
I used a collett from our bridgeport and machined a holder for it. I then mounted it on a flat piece of steel so I can hold it.
The collett is threaded at one end, It slides in the holder I made and I use a torque wrench to pinch it. Very easy to control.
I have done quite a few and am very happy with the results.
More people are finding that I have this and are asking me to pinch their sleeves.
Most of the time it does seem to give the engine a bit more life but it has lost a little bit of performance. Still good for practice or a back up engine if needed.
Greg Esser