Hi Paul, It didn't run all that well in stock form as built from the published drawing, but it did run. After
endless guessing and messing around careful scientific experiments adjusting the valve stroke and timing it ran fantastic, I checked it with a tachometer and it was doing 2600 rpm on 15 psi air! It was a lot of fun. One thing I found was that the valve needed to be a bit sloppy in the hole for it in the cylinder block, and oiled well. The fit was probably about .002" / 0.12 mm clearance. As you can see it had a fairly big disc crank with lots of inertia to keep it turning. I belted the engine to some experimental loads like a tiny Baker fan and a grinding spindle. They worked, but the engine did not make quite enough power to run these accessories. Hope this info helps.
