Gallery, Projects and General > Project Logs
The Return of No. 83, a Hot Air Engine
RussellT:
Hi Steve
I'm following with interest. What's the slot in the guide for? The original version didn't appear to have one.
Russell
vtsteam:
Hi Russell! :beer:
It's just a slot for a screwdriver.
(The original was just one piece brass, silver brazed in place. Now it's threaded and two-piece.)
RussellT:
--- Quote from: vtsteam on March 07, 2025, 11:30:35 AM ---It's just a slot for a screwdriver. :doh:
--- End quote ---
vtsteam:
:lol: Russell. Most of what I do isn't too sophisticated!
vtsteam:
Speaking of not sophisticated, when I tried reassembling the engine the power piston was ultra tight in the bore. One might even say stuck. I got it out, and then tried to figure out why. Measuring the bore revealed the fact that it was ovaled by about 2 thousandths now. Thinking about that, I kind of remember when I was boring the displacer boss I "ticked" the power cylinder against the toolholder. :bang:
Total disappointment! I was all set to try out the new changes. But no go is no go.
So of course I tried un-ovaling it in the vise, and went about a thousandth in the opposite direction. Still, it was an improvement. The only course open at that point was to hope that lapping the cylinder would bring it back into round enough to try the engine out again.
It might mean making a new piston too though, since it will result in an overbore. Well, lapping first, and we'll see what we've got.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version