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I'll close this thread with what I learned today. I got the non-runner out of storage and confirmed that the direction of rotation is clockwise looking at the power cylinder. The angle between the cranks is indeed 90 deg and when the counter-balance weight is vertical, the big end of the power conne...

Years ago I organized a group build of 6 Senft LTD engines from his book "An Introduction to Low Temperature Differential Stirling Engines." Five of the six ran well and I ended up with the poor runner. I had to put boiling water on top and ice water on the bottom to get it to run at all. ...