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Metal choices for conrods, crankshaft

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smfr:
Thanks for the suggestions, everyone! I think I'm going towards 1144 stressproof for the conrod and the other links (thought now I see it has a lower machineability rating than 1215)  :thinking:

Some good tips there for a silver-soldered crank, George!

Bill, I just yesterday ordered some Harris 45% and 56% silver brazing wire. The only place I could find online that had the 1/32" wire was http://www.airgas.com/browse/product_List.aspx?keyword=silver%20braze&CatId=484 so we'll see how that order goes.

This engine also has the piston rods and the crossheads as one forging. For that I'm going to try soldering pre-ground 303 SS to the crosshead, which will be some kind of mild steel.

Simon

tvoght:
A heads up Simon, Speedy Metals currently has a 'Fire Sale' on a 24 inch long 2 inch diameter stick of 1144 for $20. A pretty good price if the dimensions suit your needs.  As to machinability, yes it is rated less than the free-turning varieties, but my very subjective take is that it turns like a dream.

--Tim

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