Stirlingengineforum.com

Hi I am trying to make my first stirling engine, and i cant decide what material to use.
i have a lot of aluminum i can cast and it would be best if i could use it.
I know it has a high coefficient of friction but i was hoping i could use it if i anodized it
and oil the engine.

I am making a 2.5 inch bore gamma engine. i hope to be able to utilize enough power to run a belt drive blower.
There were plans for one that made 1/8 hp and it is perfect

I can also cast bronze and i have a large lathe and welder and an assortment of other tools.

Hard anodized alumium and ptfe is on of the classic solution for stirling engines.

so ptfe rings on piston?

Yes.

where do you get them?

I just make them.viewtopic.php?f=1&t=5223&start=15

how do you make them?
teflon strips?

Ok. Which technical capabilities do you have ?

I turn them from stock, or cut disc in washer form from thin sheet.

https://www.google.com/url?q=https://co ... tG4BFvUh7f

Page 124 will show you an easy to make ptfe cup seal

what is better? rings or cup seal
what do you mean by "technical capabilities"?

Technical capabilities - how big and good lathe do you have. Ie - i cant make good cast iron finishi, i have to give it for honing/polish. But alu is ok.

Cup seal or rings - cup seal is so much easier to make. But it is limited for 3-5 bar difference max. And wotks as one way valve too.