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Thanks Ian.
I will remove the galvanized cylinder as well as displacer. There are heavy, not smooth and toxic as well (As you've indicated).

Could you please explain why the gap between displacer and hot cylinder matters that much. Currently my displacer is pretty heavy as it is made of a galvanized pipe. So I decoupled it from the rest of the mechanism. Obviously I do not expect the engine to run now, but the cold cylinder should move a...

>> is you hot end thined down No. The thickness of the pipe is around 1mm. >> What is the gap between the bore of the hot end and the diplacer Around half a centimeter. >> On your power piston, is it the origional motor cycle one, with rings? No rings are removed. The piston moves quite easily and i...

Hello, I built a Stirling engine using a 50CC motorbike cylinder and a piston. Although the mechanism is not as smooth as i expected it to be, i want to give it a try to see if i can get it to run. I used a 2.25" galvanized pipe as the hot end cylinder and its length is around 12". Another...