Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

No doubt at all that they were matchined on CNC mills.  You could make out the tool path on some of the parts (mostly the flywheel) and it certainly wasn't something I think they would do manually.  I figure they could never sell at their price point with out very productive machine tools

I wasn't running from a regulated air source, just a ball valve.  That said the gauge didn't register any pressure at all......I'd guess about one to two PSI.  I got it to run even slower, but the valve was essentially shut off, and the engine would stop once the air in the hose bled off.