Four-cylinder Stirling engine - GIF

Four-cylinder Stirling engine.

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Previously:

https://www.homemadetools.net/forum/...938#post171619
https://www.homemadetools.net/forum/...362#post165966
https://www.homemadetools.net/forum/...513#post139344
https://www.homemadetools.net/forum/...041#post157177

What never ceases to amaze me about Stirling engines is the speed they can achieve. Every cycle of the power piston corresponds to a heating/cooling cycle of the gas in the displacer chamber. That a volume of gas can be cycled so quickly between two temperature states is simply astounding.

I wonder what the torque could be...