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david simmo	25/08/2013 08:12:55
33 forum posts	hi on gun metal casting(cylinders) whitch is best gunmetal to gunmetal or gunmetal to s/steel it for the pistons and bobin(vavle) thanks dave
Stub Mandrel	25/08/2013 09:48:10
4318 forum posts 291 photos 1 articles	Hi David, Gunmetal does not wear well on gunmetal. It wears best with a harder metal. In general avoid two similar metals moving against each other, the exception is cast iron. Neil
JasonB	25/08/2013 10:08:01
25215 forum posts 3105 photos 1 articles	I'd probably opt for brass for both the piston and valve, keep the stainless for the rods
david simmo	25/08/2013 15:19:57
33 forum posts	hi mickw it a3 1/2 gauge brittania hopefully along time thanks dave Edited By david simmo on 25/08/2013 15:20:29
Stub Mandrel	25/08/2013 17:08:04
4318 forum posts 291 photos 1 articles	So presumably piston valves. I'd suggest stainless steel, finished to as smooth and close a fit as you can get. Neil

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