Piston material for S50 engine

[The Merry MillerParticipant @themerrymiller]

[The Merry MillerParticipant @themerrymiller]

 

 

This question has probably been asked many times but search as I might I can’t find answers on this forum.

 

The raw material supplied in the kit for the Stuart S50 engine is supposed to be brass but it has a slight coloured sheen on the outer face which leads me to believe that it may be phosphor bronze.

 

The question is what is preferable for a piston operating inside a cast iron cylinder, brass or phosphor bronze?

 

I’ll most probably be running on compressed air until I have built a boiler for it.

 

Len. P.

[BogstandardParticipant @bogstandard]

It wouldn’t really matter in your situation, but the bronze would be a little better in the wear stakes.

 

You might find a little difference in the machining, but I would expect Stuarts to supply a free cutting bronze anyway, so just go ahead and use it, the sky won’t fall on your head.

 

 

John

[Author]

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