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Does anybody have experience to determine compliance approximate dimensions between steel wool displacer and normal? If swap volume of the normal displacer is one what is the swap volume of the steel wool displacer at the same sizes?

Sameman, I think it might be a case of try it and see, it depends on how much it is compressed, if it's too dense the air will be impeded, if not enough the surface area will be insufficient. the better medium to use in a regenerator is stainless steel shim/foil. See Andy Ross's book "Making Stirling Engines", it's a free down load, 68 pages. Ian S C

More thanks, I guessed about this factors, but I wait opinion of experienced builder engines with this type of displacer, who can give a quotient. In my opinion, it is about 5-8, depending of a temperature and speed. Perhaps every time not less than 5, but interesting a length depending of speed - 1.5-2 or more diameters?

Make the steel wool displacer to similar dimensions to a normal cylindrical metal one, just don't worry about the side clearance, although the contact between the steel wool and the hot cap should be minimal.
Ian S C

Thanks for share…