Time for a flywheel. I have a big chunk of 4-1/2" diameter something or other. I cut a piece off, and here it is. I cut it off far too long, there is a lot of material to take off - although the face coming from the previous owner was really out of square so I had to allow for that.
I thought it was just some low carbon steel - A36 or similar, but as I turned it, it became quite apparent that it was not. My best guess is 4140.
Roughing it in:
I was fighting tangles the whole time. Got through it though, and now the engine has all its bits and pieces.
It runs really well, even though I drilled one air supply passage too deep, and have broken through into one of the exhaust ports. It will run even better when I fix that.
Hopefully I will take a little video of it running today.
It was a very simple and fun build. I only did it in order to have an extra display item for the Indiana Engine Show next weekend - but I had forgotten how fun these simpler and quick engine builds can be, I really enjoyed making this.
I have to tidy up the plans a bit, but I'll post those as well. This is not my design - it is just an upsized Elmer Four Square engine.
), and had a good chance of getting done in the time available. It was really enjoyable to do without going all toolroom on it (which I like to do - but not needed on everything) and it's reminded me what a pleasure it is to do something and finish it in a short period. Might have to slip in this kind of project from time to time.
piece where I balance a coin on it while it runs.