piston and sleeve

[Pit bull kinda guy]

How would I polish/resize a piston and sleeve in a .21 engine

 

[ninnon]

Generally you don't, if you're talking about porting and polishing to gain performance, then that is a specialist thing, and you need to know what you're doing. As for re- sizing, again, you don't- you usually buy a bigger engine or a new piston and sleeve.

 

[olds97_lss]

There are a few places that will do a re-pinch for you for around $20-$30. Many years ago, I used RayARacing. The first one I had OSRocket do, they pinched too much and it was a real pain with a pull-start. The second 3-4 I sent were to RayARacing, I asked for a mild pinch and they were perfect. Allowed me to eek out another season or two before needing to replace the engine.


Couple others I found that offer the service as well as engine mods like your asking about:
https://www.rbmods.net/sevices
http://www.abmods.com/

Another pinch service:
http://www.osrocketracing.com/pistonsleeve.php

Not sure if any/all are still in business, so you may want to check out their sites for emails and send them one.

This is a thread I made in 2008 when I sent some to RayARacing with photo's I just updated in the last post. Had to add the photo's again since I'm unable to edit the original post and comcast recently dropped their free website hosting which is where I had the images stored:
https://www.rcnitrotalk.com/forum/t...ing-photo-intensive.56420/page-2#post-1093502