After I got my 4 1/2" flywheel finished for the unCorliss, I still hadn't finished reworking the valve rod so I pulled another engine down from the top shelf to run it on. The first engine I grabbed was the vertical overcrank engine that I built last year. I always thought that engine needed a bigger flywheel but I never got around to it. Not only did it look better, the performance was much better. All of the engines on the top shelf began to jump up and down and shout "Now do me!" I couldn't resist. They all got a turn and they all ran better except for the 4 cylinder Weeble that is the oldest engine on the shelf. It uses a rotary valve on the shaft and has some hours on it and the weight of this flywheel causes some air leak. It ran better if I laid it over so the valve was vertical but it was happier with a lighter flywheel.
Here is a compiled view of all four engines. If you wonder why you don't hear the air compressor kicking in, wait until the last segment.
Jerry
