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 Post subject: slide valve material
PostPosted: Tue Apr 17, 2018 1:22 am 
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Lighting the Boiler
Lighting the Boiler

Joined: Tue Nov 07, 2017 1:10 am
Posts: 37
Boat Name: No Boat Yet
I'm ready to start machining my engine. Whats best :cast iron, brass (leaded or non) bronze, mild steel? I'm leaning towards leaded brass but I don't know if that's right. I have the capabilities to cast it so I'm tempted to do everything except the crankshaft in it.

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 Post subject: Re: slide valve material
PostPosted: Tue Apr 17, 2018 1:10 pm 
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Full Steam Ahead
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Joined: Thu Nov 19, 2009 2:51 am
Posts: 244
Location: Colorado USA
Boat Name: TBD
What's the material of the block?

With the rare exception of cast iron on cast iron, generally a metal sliding on the same metal will lead to sadness. There are times that you can get away with mating similar materials but it's dependent on velocity, pressure & lubrication.

The tried & true combination would be cast iron valve on nearly any other material.

Cheers

Ken


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 Post subject: Re: slide valve material
PostPosted: Tue Apr 17, 2018 7:34 pm 
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Full Steam Ahead
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Joined: Fri Nov 27, 2009 5:56 pm
Posts: 1494
Location: Northwest Detroit
Boat Name: Iron Chief
As Ken says, cast iron is well proven, however only grey cast iron, not nodular cast iron. Nodular cast iron is not good for pistons and logically slide valves, sliding surfaces.

-Ron


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 Post subject: Re: slide valve material
PostPosted: Wed Apr 18, 2018 4:27 pm 
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Full Steam Ahead
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Joined: Wed Dec 07, 2011 6:41 am
Posts: 1548
Location: Lopez Island, Washington State, USA
Boat Name: S.L. Folly
Iron on iron on every surface of my engine except the connecting rod big end. Running for years with no problems on saturated steam with no internal lubrication except water condensation.

I would machine your cylinder valve face on a raised mesa so that long term wear will not find your valve living in a valley.

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