Ageless Radial Engines
Field Service Note # 4
Sources for Piston Ring Cast Iron
For many years Coles Power Models was located in Ventura California. Coles provided all types of the engineering supplies used by model makers.
The material recommended for making the piston rings was known only as " fine grain cast iron ".
In 2007 Coles was sold to :
Coles Power Models
P.O. Box 623
Warren Texas 77664
( 409 ) 547 - 3400 CST
Web Site : www.colespowermodels.com
The " fine grain cast iron " is still available. Be very sure you DO NOT ORDER - Ductile iron.
The prosperities of ductile iron will not provide the necessary spring tension needed to hold the piston rings against the cylinder wall.
The piston ring cast iron can also be purchased from
Mc Master - Carr
P.O. Box 4355
Chicago Illinois 60680
630 - 833 - 0300 CST
Their grade is sold as " G-2 "
In the United Kingdom a similar material is GA 300 This can be purchased from
Arrow Butler Castings LTD.
Derbyshire S41 - 9ES
+44 ( 0 ) 1246 450027