It runs! woohoo1
As some of you may know, it wasn't without trials and tribulations. In the end, it was decided an engine like this may be better suited to run on actual steam as the expansion of the steam should assist the movement of the piston. There may have been some single compound engines built that will run on air but this one didn't, so after a few days of fussing with it and posting a separate thread about it, I threw in the towel and re-ported the cylinders. So this is now a standard double-acting steam engine. Maybe it no longer qualifies as an Elmer's 45 but the parts are all the same except for the shoe valve I had to remake.
Without further ado, never let it be said that Troutsqueezer does not back up his engine builds with videos. ;D
[ame]http://www.youtube.com/watch?v=qFcnx-YnKIA[/ame]