Hello Tim,
I built one of these engines in 2006. I keep a journal of most of the engines I build, especially if I make changes to the design, and to note machining set-ups. So I might be able to help you somewhat. Very seldom do I make an engine exactly like it is designed. Some work, some do not. One change I did to this engine was to center the bore in the cylinder rather than having it close to the bottom. This involved lowering the mounting positions on the frame which were not too much of a problem. I used a 1.00 OD DOM steel cylinder liner and an alum piston with one Cast Iron ring. The engine has good compression and runs well. The only thing I would change would be to complete the governor system, so the engine would cycle some cool air in the cylinder a few revs between firings. As it is set up now it tends to run hot after a few minutes. I tried puting water in the hopper, and even that gets hot in a short while. I think the heavy flywheels might add to this situation. What questions do you have?
ART
