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| Mrs. Robinson, Revisited....... |
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| Stilldrillin:
VT. Nomate....... Not that big. Seems around 5 thou clearance. Dave, Stuart. Thanks for that. Not the sort of thing I get up to these days. Or, even previously! :scratch: Popped the packet of 5, into a tub marked BEARINGS. Along with the previous freebies, from yourself, and Deco. :thumbup: David D |
| Stilldrillin:
I said it was too getting hot, under her skirt. Didn't I? :bugeye: Even with the choke ring, the present burner is too enthusiastic....... :palm: Some mica insulation, under the feet........ Fitted a No3 jet, and made a smaller rose....... Good. But still too much........ So, I reduced the burner area even more........ And, I reckon it could still work well, even smaller........ Start up from cold, is now "instant". 10secs is all she needs to begin to run. Here's a little vid, during a 1hr test run. Mounted on a plastic turntable. Should give a smile....... That was when I realised the flywheel balance weight was out of sync. After fitting the new bearings! :Doh: Just got to find why she clonks, when hot. But not when cold........ David D |
| vtsteam:
David, displacer grows when hot, contacts end? |
| Stilldrillin:
--- Quote from: vtsteam on June 30, 2013, 10:39:49 PM ---David, displacer grows when hot, contacts end? --- End quote --- It has to be something similar....... :scratch: Though it seems to be in sync with the power piston. At tdc. During the changeover between suck/ blow. The Huxtable engine does the same thing. But, not as noticeable. Strange things, hot air engines. Love 'em! :thumbup: David D |
| vtsteam:
David Is the bore bell shaped? Can't remember if you did (or needed) a re-bore and oversize piston in the re-build.... I can imagine clack at TDC happening on a hot air power piston if the piston crown wasn't parallel with the wrist pin, or if the piston skirt wasn't long enough compared with the distance from wrist pin to crown -- assuming a little play in the bore at TDC. As a guess, piston would tend to ride slightly skewed, and change the skew angle when the pressure changes sign. Clack would happen then. Loose wrist pin would also do it .... though at both ends of the stroke |
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