Stirlingengineforum.com

When I wrote leakage at the piston axis I really meant air leakage at the
displacer shaft. I understand that leakage at the working piston is not a good idea.
In the video I attached the hole for the displacer shaft does not seem very tight
and still the pressure seems to hold for a long time.

I have been trying to construct a few small stirling engines with very little succes. One of them could barely run at very hot conditions. I wonder how critical the size of the displacer is? Is it possible to say anything about the relationship of the displacer and the tube around it. And is air lea...