The Craftmans Shop > Model Engineering

Rockerblock engine--something a little different--

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Brian Rupnow:
I ended up having to angle both the exhaust and the carburetor out 12 degrees from centerline to clear the gas tank. I could have squeaked by with leaving them "in line" but it would have been severely crowded, and since I have to make the yellow "elbows" anyways, I might as well do this and buy a bit of room.

Brian Rupnow:
Has anybody used this type of con-rod connection at the crankshaft? I'm pressed for room where my rod attaches to the one piece crankshaft, and this would get me out of trouble. I think the actual hole for the rod journal would be the last step in the fabricating operation so everything would run true. I haven't used this before, but there's a first time for everything.--Brian

Brian Rupnow:
Dang, this thing is like a big chocolate cake!! All the pieces look so good, I don't know where to start. The beauty is in the simplicity. I shouldn't get so excited about my own work. Every time I do this I swear to myself that I'm going to take it easy, there's no rush, I'll just work on it in my spare time. Then it takes over my life and making another part is all I can think about. Good wife is away at her job in the local library, and won't be home until 3:00, so I think I'll make gears today. Gears are always fun. A bit intimidating, but fun, nonetheless.

Brian Rupnow:
The only real bad dancer I had was the first "Rupnow Engine" which was a horizontal hit and miss single with a set of flyball govenors. It had full diameter brass discs for crank throws, and they were heavy. Since I always bolt or clamp my engines down, I never realized how badly out of balance those full discs made it. A guy from Australia built it and posted a video of it "walking" across his fathers living room floor. He hadn't bolted the engine down when he started it, and they were all amazed to see an engine take off and try to walk back to Canada by itself.

Brian Rupnow:
What good is a build thread without "in process" shots? This is my 50 tooth gear, emerging from another "chucking stub" left over  from making a cast iron cylinder. It was barely, barely long enough. I hate doing really short stubs, because if you get to close to those hardened chuck jaws with the gear cutter you can kiss $80 goodbye. The 25 tooth gear which I will do next is on a comfortably longer piece of 1045 steel that was left over from a customer job.

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