Make a Stirling engine from scrap!!

This Gamma Stirling engine was made from pieces of scrap found in the workshop, the aluminium heat sink from a motor bike crash and some copper tube off cuts. The most critical component, the first 'power piston' was cast, using epoxy resin, actually in the greased copper tube to ensure the perfect fit necessary for the engine to work. This was later replaced with machined aluminium piston which was used in the video. It runs surprisingly well on a small home made meths burner. Stroke is 25mm , note the 90 degree offset timing of the two pistons and the unusual take off position midway down the displacer cylinder. The ' displacer' itself ( just a sealed tube) running in the chrome tube is 25 mm shorter than the cylinder itself and leaves a gap around the outside to allow the hot gas to flow past to the cold end.