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Sorry no pics, I don't think of stove tops as low temp I didn't intend to imply that but reading my post I can see where the ambiguity lay. I notice that LTD engines seems to be very squat whereas your HTD engine has a longer stroke. Still looking for a suitable displacer - none of the cans I have ...

Thanks, Ian. Sounds like your displacer cylinder is long and thin rather than short and fat like a lot of LTD engines I've seen. Think I've got some thin steel tube in the garage that might do the trick. Not sure how I'll make ends for it but you've given me some starting points. Any pictures of you...

I'd like to power a small fan (~15cm diameter) on top of my woodstove to move the hot air about so I need an engine that isn't going to melt. For the power cylinder, I'm using a cast iron brake cylinder from a Ford Mondeo - the inner diameter is about 20mm. It's about 50mm long. I'm intending to use...

Had to scrap an old hot air gun (Clarke/Machinemart) and inside the nozzle is a very accurately formed ceramic cylinder, about 20mm diameter, 80mm long - thought this would make a useful power cylinder as very heat proof, albeit fairly fragile.

Planning on making a displacer (gamma?) type engine to power a fan on top of my woodstove, so it needs to be able to operate at high temperatures. Planning on making a displacer out of aluminium drinks cans, possibly filled with expanding foam, with a stainless steel cylinder. The power piston will ...