Help with piston rings.

[brickyParticipant @bricky]

Hello all 

I would appreciate some help.

I am building a 2″Burrell Gold Medal single cylinder tractor.The dimentions of the bore are 1.060″ the gap in the piston is .125 radial and .125 axial.My need is the gap that I will need to leave for expansion in the piston ring when fitted. I have read the articles by Tubal Cain but I am not sure that I have fully understood the text.Could someone who dose give me a simple answer to my problem.  

Thank you in anticipation. Francis Boyle

[brickyParticipant @bricky]

[JasonBModerator @jasonb]

1/8×1/8 sounds like the groove should be filled with graphite yarn or ptfe which would be likely as the cylinder is GM so you should not need to worry about expansion.

 

If it were CI rings then the groove would not be as deep more like .070x.050 for each ring

 

Jason

[brickyParticipant @bricky]

Thanks for that Jason,I will do as you say and get some graphite yarn.An answer from an experienced modeler is just what I needed.Thanks again Francis Boyle.

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