Mr.William, you had asked me
> Do you have a source of heat applied at one cylinder and cooling at the other?
Since I propose to use this engine as a cryocooler, I do not intend to apply external heat. But I do cool the heat exchanger that's connected to the follower piston using running water.
You had also asked me
> Will the engine at room temperature turn over easily by hand? If it does NOT excess friction is present in the sliding piston surfaces and bearings etc. Friction is the enemy in many cases. DO NOT OIL a Stirling engine.
To minimize friction, I have used epoxy graphite pistons and brand new sealed ball bearings at all moving joints. So I'm certain that friction is a non issue here.
The trouble is, I decided to use a longer stroke length for the pistons so that I can get good compression and expansion of the working fluid (atmospheric pressure air). I learnt from Mr.Brumman http://www.youtube.com/watch?v=TBEkdKBL1TA that its a good thing to have high compression ratios for achieving sub zero temperatures. The high compression and expantion makes my engine slightly difficult to rotate the flywheel by hand.
Mr.William, I'm quite eager to know how the lead angle changes to 180 degrees when the rotation direction is reversed and how it helps to increase the cooling effect. Kindly let me know where I might be going wrong. Thank you for sticking on with me.