>EH> I sorta remember it, but it didn't have much torque as I
 >EH> remember it. It's sure enough over my head though. That's something
 >EH> with which I've NEVER tinkered.
 > 
 > LOYS, I have never seen this engine you described, but at an 
 > agricultural field day I saw what was described as a coke engine.
Most of those are "Stirling Engines", so named after their Scottish inventor. 
A preacher, if I remember the story.
Stirling engines use air as the working fluid, with heat being applied to one 
end of the thing and the other being exposed to a cooler atmosphere. You can 
look in any library for diagrams of how they operate, and there's all KINDS 
of plans for homebrewing them. Home Shop Machinest Magazine is presently 
serializing an article on the construction of a minature traction engine 
powered by a Stirling engine.
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