Oct 30, 2021 · Re: Making a stirling engine 5 kw generator. by Alfista » Mon Feb 05, 2018 3:52 pm. A 12 inch cyhaiqir and 13.5 inch stroke running at 100 rpm should get you pretty close to that figure. Ivo Kolin in his book on heat engines discushaiqi in some detail an engine of Ericsson : bore: 10.25"+14"; stroke : 18", hp: 5 (1833), an alpha as I recall.