The new member with first engine

Discussion on Stirling or "hot air" engines (all types)
cbstirling2
Posts: 153
Joined: Sat Dec 17, 2016 9:35 pm

Re: The new member with first engine

Post by cbstirling2 » Fri May 03, 2019 7:29 am

It looks like it wants to run but has too much friction...
CBStirling2

Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: The new member with first engine

Post by Ian S C » Sat May 04, 2019 3:33 am

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
Posts: 11
Joined: Thu Mar 24, 2011 7:20 am
Location: Viet Nam
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Re: The new member with first engine

Post by loccd » Sun May 05, 2019 7:34 pm

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

Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: The new member with first engine

Post by Ian S C » Mon May 06, 2019 4:10 am

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

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