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I'm not too sure about the clearance in a motor that big, a gap of 2.5 mm/3 mm sounds about right by me, I think maybe 4 mm/ 5 mm for end clearance. Really if you are going to build to this size you should have a machine shop with at least a lathe, and quite a big one at that. Ian S C Unfortunately...

Thanks for the tip Ian, glad to hear the crown could be shortened. Am i correct assuming the hot cap itself should be shortened accordingly, containing as low dead volume as possible? This leads me to another question - is there some rule of thumb for crown side clearance to hot cap (e.g. in order t...

Blaf, some alphas have displacers and since you have not started building yet, I would encourage you to consider the possibility in your design. Usually, this has the result of moving the rings of the the hot piston a good distance from the heat. Directly heating the cylinder and piston is rather p...

A power cylinder could be made from an old wet sleeve from a truck or tractor engine, this might give you 120/150 mm bore (there's one under my bench). It's possible your scheme could work, but how round is the stainless AC tube. Adapt your design from a working motor. Ian S C I was also wondering ...

Hi, thank you for the reply. You understood correctly, i planned using stainless tube for both hot cap and power cylinder. I choosed such tube because its quite cheap. What would you recommend using for power cylinder instead? Or maybe could you elaborate more about why is stainless steel bad choice...

Hi guys and gals, I'm thinking about building a larger alpha stirling for exhibition at one post-apocalyptic (of that stylized kind - Mad Max/Fallout style) event. Since i'm pretty tight on the budget and also have no access to any machining tools, i was wondering if building a stirling from ready-t...