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It may seem like a lot of heat but when the base is a 26mm thick and 150mm diameter chunk of aluminium it took a lot of heat to get it hot! I've since used a laser thermometer to take some scientific measurements and it ran at 420rpm at 180c temperature difference which is far less than I...

The finned photo is revision two, which included cooling fins for the upper section and aluminium for the lower inch of the dispacer cylinder

Here is my first stirling engine intended to be a wood burning stove fan. My issue is that it takes too much heat to get running. Can anyone suggest where to start redesigning to lower the start up temperature? The lower inch of the dispacer cylinder is aluminium. The displacer is a plain hollow...