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Mystery casting

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10ba12ba03/06/2020 05:03:20
15 forum posts
10 photos


Last year I bought some castings for a vastly scaled-up K.N.Harris launch engine. With these bits came the ?part machined casting in the photos, can anyone identify it, or indeed suggest its intended purpose - other than a 2.8kg paperweight? The porting is unusual.

Perko703/06/2020 08:00:01
330 forum posts
24 photos

Uniflow steam engine with poppet valves on the inlets? Seem to recall some one of the steam cars described in ME in the late 50's had something like this. Don't think it would be any of the main designers of that period (LBSC, Martin Evans etc)

MichaelR03/06/2020 08:40:49
374 forum posts
79 photos

Looks like a Uniflow cylinder casting with the exhaust ports in the bores, going by the size it could be for the Atkinson Uniflow steam wagon by a Ray Prime I think the model was serialised in Engineering in Miniature.

And there again I could be wrong.


10ba12ba03/06/2020 15:46:16
15 forum posts
10 photos

Thank you gentlemen.

I have had a look at the EIM articles on the Atkinson, regrettably that's not it. I forgot to mention that there is another casting, exactly the same but unmachined. Making a 4 cylinder uniflow?

Neil Wyatt03/06/2020 17:48:21
17910 forum posts
706 photos
77 articles

Before I read teh commenst my first thought was a uniflow design.

This animation from et Wikipedia article may help you visualise how it would work:

In the real world a somewhat thinner piston might be used to extend the exhaust period a bit


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