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Strangely enough, I went the other route and worked to the original drawings in Imperial, but converted the threads to metric. As it happens, the metric sizes are pretty close to the Imperial sizes, although I used drill & tap tables to get a closer fit when drilling. So, I found that 2-56...

When built my version, I made a cover for these ports, which also gave me enough thickness to drill & tap an inlet hole to supply the incoming air. You can just see the supply pipe on the photo above. Not that I don't trust my silver soldering, of course! It's a nice engine, and a good size...

Hi, Ron - It was certainly fun making that engine, especially as I worked entirely from the set of drawings, and no notes so that I was able to figure out how to set things up and machine the parts. That's the fun part - figuring things out. Although I live in California, I am actually British...

Hi, Brian - Just joined the forum, having just yesterday completed building your beam engine - which I hasten to add actually works! Very satisfying to make something just from the drawings (even though they're in Imperial). Just a couple of observations: a) The cylinder does need a cover to...