The new member with first engine

[cbstirling2]

It looks like it wants to run but has too much friction...

[Ian S C]

What is the power piston and cylinder made of, and how far under the hot cap do you put the flame? What is the fly wheel made of?
Ian S C

[loccd]

power piston is graphite, cylinder is aluminium air tight and low friction

[Ian S C]

Is the bore of the cylinder highly polished? The preferred cylinder for graphite pistons seems to be precision ground glass, stainless steel would be second on the list, followed by cast iron and carbon steel(mild steel is OK), bronze and brass would be good. Aluminium unless treated comes in way down the list, it's too soft to be a good engineering bearing surface.
Was the motor built to a published design? I'v got a Bohm HB-7 made in Germany, I would be ashamed to produce a motor of that design, it looks OK, but that's all.
Ian S C