Engines > From Plans

Rebuild time for my Upshur single

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Art K:
Hi all,
I have been working out in the shop a bit lately. Towards the end of last summer I decided it was time to pull my Hamilton Upshur based vertical single apart and figure out why it was running so bad. This is what I found.


You can see in the first photo the spots on the rod where it was hitting the cylinder & cam. On the cylinder you can see the contact point, there's a matching one on the top side you cant see in the photo. On the crank the rod throw is .003 under on the high points so a new crank is also in order. In the bottom photo you can see the .040" oblong. No fix but a new one there as well. I have made a start on some of this and will post my progress as I am able. I have a link to the other forum that I posted soon after joining there.
https://www.homemodelenginemachinist.com/threads/my-first-engine.18599/
I have made a lot of changes over the years, all have made it better or solve self inflicted problems.
Art

kuhncw:
Hi Art,

Which grade of aluminum did you use for your original connecting rod?

Chuck

Art K:
Chuck I think it was probably 6061 t5. But I also bored it over size & filed the cap down to compensate.
Art

Brian Rupnow:
Art was up to Canada last summer, and stopped by for a visit. He had brought a couple of his engines with him, and ran them for me. Very nice little engines. I think the engine featured here was one of them.--Brian

Art K:
Brian,
Yes this was one of the engines I brought along last summer. Soon after getting home I started to dismantle it. I turned a blank on on the lathe to make a new cylinder head. I left the diameter and the top oversize, then left the .040" on top to give the valve guides a little extra. The bottom looks like this. The top despite being stranded in the chuck in the rotary table for 5 months I never got a photo of.

When I got my Tormach it came with a Dell PC. When I switched to Path Pilot I couldn't use that PC any more. I had a used computer built at 1/7 the price of the Tormach unit. Well in August or September the power supply blew taking the mother board with it. My computer guy had one to replace it but couldn't set it up properly (or understand why I'd want it set up that way). On top of that he was out due to surgery, had a hard time getting caught up with it. In the end I drove 3 hours dropped it off for my nephew to look at and took it home with me 3hours later, two weeks before Christmas.
I used the 4 holes on the bottom surface with screws cut off to locate it and bolted it down through the valve guide holes.

This is what it looked like after the roughing pass.
Art

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