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| stirling lad:
yes but it's starting to look like a very nice paper weight,, :dremel: ...Mike... |
| sorveltaja:
Dave, too bad you couldn't get it to run :scratch:. I assume, that you have checked, that dimensions of parts are correct? How about their materials? |
| NickG:
Dave, what is the knurled bit on top of the power cylinder for? Looks like you'll have to go back to basics, what are the clearances radially and on the ends of travel of the displacer, also, what diameter is the displacer and power piston? You want the displacer swept volume to be significantly higher than the power piston (look at the ones on you're robinson - the difference in diameters is huge). On this type of engine (gamma I think) the only way is to have a larger diameter since the strokes are the same running off the same crank. Then it's just a matter of friction if the leaks are sorted. Hope this helps. you'll get there, these things are usually temperamental! Nick |
| Dean W:
It sure is a nice looking engine, David. It will look even better when it's running! I'm puzzled at the call for glue in the prints, especially in a heat engine. Just doesn't seem right. I think tracking down any friction, no matter how slight, is in order. Also, be very critical of leaks, however small they may be. Nice looking flywheel there... ; ) Dean |
| Stilldrillin:
Thanks for your comments Chaps! :thumbup: Nick, the knurled thumbscrew with O ring, replaces a 6mm bolt and fibre washer. Not completely sure why they have a T junction. But it makes oiling the piston easy..... As I reassembled, I checked it was to drawing spec. Apart from 7/32" dia shafts, an alloy piston, and plain crank bearing, I couldn't see much wrong....... ::) This one, on Ebay at the moment, seems to run ok! The stroke is 3/4" (19mm). Piston 26mm dia. Displacer (only?) 32mm dia. I wonder if the oversize displacer shaft, is altering the cold end swept volume, significantly? :scratch: Anyroad! I'm looking at reducing shaft diameters, needle/ ball bearings, new piston in a different material. Probably! David D |
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