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Combined Piston/Valve

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mklotz:
I built a valveless engine, Simon Junior, from plans in Model Engineer magazine.  You can see a description and video of it in action here...

https://www.homemadetools.net/forum/valveless-steam-engine-50201#post72033

It runs very nicely and no porting through the piston is required.

PaulR:

--- Quote from: mklotz on October 04, 2025, 05:32:30 PM ---I built a valveless engine, Simon Junior, from plans in Model Engineer magazine.  You can see a description and video of it in action here...

https://www.homemadetools.net/forum/valveless-steam-engine-50201#post72033

It runs very nicely and no porting through the piston is required.

--- End quote ---
Thanks Marv, you sent me the plans for that some time ago and it's still on my to-do list.

PaulR:
I'm going to give this a try, off to the build log section we go...

gipetto:
I don't think it would work efficiently or at all, because for the piston to return to top dead center it would need to compress air which would react against the power stroke.
I think a better design would be to make the piston rotate to give more configurability to the strokes. that is similar to how an orbital power steering unit operates.

crueby:

--- Quote from: gipetto on October 06, 2025, 09:06:48 PM ---I don't think it would work efficiently or at all, because for the piston to return to top dead center it would need to compress air which would react against the power stroke.
I think a better design would be to make the piston rotate to give more configurability to the strokes. that is similar to how an orbital power steering unit operates.

--- End quote ---
Orbital power steering  unit, I  got to look that one up! Google! Get over here!!

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