Stirling 1

Stirling project #1
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This is basically just a first effort, I plan on machining some nicer parts from scratch once I nail down the design. The brass power piston rod and rod bearings are a bit sloppy. I just want to get a working model first before I redesign some of the parts.
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I used my CNC machine to machine some of the pieces. There is an air groove machined into the aluminum that connects the displacer and power cylinders. The brass is the valve cover, so to speak. There is a thin layer of high temp silicon gasket sealer under all the brass cylinder plates to keep them air tight. The flywheel spins freely, there is no binding. I JB welded an aluminum plug into the end of the displacer cylinder. It is about an inch long. I figured it would be better at retaining heat since the brass tubing is rather thin. I still have to add some aluminum heat sink fins to both cylinders and make a wooden base. This is basically just a first effort, I plan on machining some nicer parts from scratch once I nail down the design. Problem is, it doesn't work...... (yet)
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The stroke is about 7/16" on both cylinders. The power piston is about .5" long. The displacer piston is about 1.5" long. The power piston cylinder fit is close, but not tight, it moves freely. The displacer piston has an air gap around the outside of maybe 2mm????
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The air passage between cylinders	This is the new brass valve cover that covers the air passage channel. The displacer cylinder was modified to use a threaded brass pipe. This way I can get a good seal on both ends, and take it apart if needed.
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Still can't get it to run I added heat sink fins and tried to re-route the air flow between cylinders via tubing instead of the air channel. I need to make both cylinders larger and make the cool side of the displacer piston, run cooler. I'll get back on this engine after I get a better understanding of the workings of a Sterling engine. meanwhile, I needed results so I built the walking beam tin can engine and it runs.
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