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?Chinese? Stirling Beam Engine

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klank:
Thank you very much Nick - you have nailed it (I hope).
I am toying with either lengthening the light Ally displacer piston a tad, or re-adjusting the brass rod frames to bring the whole crankshaft/motion a bit closer to the block (the 4 rods have washers under the threaded ends - take these out!). That maybe where I went wrong - in putting them in in the first place - I wanted to be sure the displacer did not touch the hot tube end internally.
I will let you know how it turns out.
Thanks for all your kind help.

Peter

NickG:
Yeah, there are couple of ways of doing it. It really does want to be as close as poss without touching at both extremes of stroke.

klank:
I appreciate this thread is a bit of an oldie now, but want to say thanks to Nick and Stew and Boggs and everyone else who offered help  - I have returned to do battle with this little sucker (not!!).

Following your advice, I re-set the stroke of the displacer piston such that it nearly touches the end cap of the tube at t.d.c. as it were and tried it again with some heat - made a heck of a difference - it almost "caught" - ticked over for a lot more revolutions before dying on me.
I noticed a bit of "smoke" emerging from the top end of the power piston - something not right.
Cut to the chase - made a better fitting power piston 0.08mm larger diameter - does a much better "plop" test and hardly sinks under its own weight when dropped in the top of the bore against a sealed up bottom end. The original piston was too sloppy a fit in the cylinder (my fault).
Now under heat it catches for even more of a bit longer - but still dies after a while.
I think the new power piston needs a bit more bedding in -a few rough spots to smooth off the bore - I have high hopes at last that I might get this thing to run. Going to put the electric motor back on it for a while.

sbwhart:
Your getting close Peter  :thumbup: a little bit more fettling and she'll run all day.

Good luck

Stew

klank:
Thanks Stew
Pleased to say I got it running at last.
The last bit of the puzzle was to firmly bolt the frame down - when trying to run it before, free standing on the bench, there was a bit too much vibration in the brass framing/built up crank. This seemed to "upset" the running.
Now it ticks over quite sweetly on a breath of clear flame from my propane torch.
I'm quite chuffed that it actually works!

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