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Thanks Jan, nice writeup. I frequently visit your pages to find inspiration!

Allthough I am sure that a long tube between displacer chamber and power piston somehow affects engine performace, I agree that the most resonable explanation for the two minute prewarm time is –as you say- related to engine mass and probably friction as well. In my case, the displacer itself is...

Thanks Longboy – I really took a risk in making such a long path for the pressure variations. I estimate the combined length of the drilled “tube” between power piston and the displacer chamber to be at least 150mm long, and this length almost kept me awake some nights! I was quite worried that...

The final engine. The second picture shows it together with my first LTD. The engine runs at around 900 RPM for 20 minutes on a tank. Thanks for Reading this long story:)

Adding some small parts..

Fuel tank..

Making the aluminum to glass interface ring + test Assembly.

It begins to look like an engine!

Cutting fins and enlarging the hole for the displacer.

Fastening holes, then over to the lathe!

Finding edges and center, drilling and reaming cooler..

Cutting a piece for the cooler section using the bandsaw followed by facing.

Making a stand for cooler and displacer..

Drilling tunnels. I brazed a longer shaft to the drill bit using the lathe chuck and tailstock as holders. Sorry for the blurry picture. The drillbit ended up about 120 mm long.

Time for some action! Baseplate cutting in 7075 aluminum, then facing it to correct thickness.

Time to plan the engine baseplate! The long red sections you see on the screen serves as “tubes” for the pressure difference generated by the displacer and for leading alcohol from the tank to the wick. These tunnels are 3 mm in diameter, drilled in the 9 mm baseplate.

I had a thick bolt of plastic laying around, so I made a fixture for a roughly cut piece of ordinary 6 mm window glass. The fixture was made so that I could grind both the outside and inside diameter without having to reposition the glass wheel between the two operations. To keep the glass from...

Hello to all, this is my attempt to build my second stirling engine.