[AJD] Oversize piston rings

[Ronald L. Cook]

That is a common practice with radial aircraft engines.  It is called 
"tailored" rings.  I see no problem whatsoever as long as you do not 
get the gap too tight.  Check each ring throughout the bore.

Ron Cook
Salix, IA

>I'm rebuilding the engine on a  1938 JD B, 4 1/4"
>cylinder bore. The best block and pistons that I have
>are .030 oversized. In checking with Deere, .030 over
>piston rings are no longer available, but .045 over
>rings still can be obtained. I also checked with my
>local machine shop as they have been able to obtain
>obselete sized rings in the past. They struck out this
>time and could not get the .030 over either. The
>machine shop suggested getting the .045 rings from
>Deere  and then carefully file and fit the rings to
>the cylinder until I have proper end gap on the rings
>(checking end gap at various points in the bore).
>
>
>Which brings up the question I would like to post to
>list members. Is this proceedure possible or will I
>run iunto some problem that I haven't forseen. The
>alternative is to have a set of rings custom made,
>which would be at least twice as expensive. I would
>appreciate your opinions both for and against using
>the filed down rings.
>
>Thanks,
>
>John Boehm
>Woodland, CA
>Visit my web site at http://vintagetractors.com
>
>
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