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

Cleaned and oiled the black one up a bit.  Hooked it up to air to see if it would run.  It would not.  Worked on it some more.  Appears to not be timed correctly.  Turns out out it is a single action motor, only power on the down stroke.  The opposite end of the cylinder is open to air.  The slide valve only has two ports, one to power the top of the piston and the second is a bleed, allowing the pressure to bleed to the bottom of the piston and out the open end on the up stroke.  Seems unusual to me, but maybe not.

Gene