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

I was looking on eBay when I saw a piston & cylinder for a full sized oscillating engine. It was very small full sized engine but it would make for a very large model. I bought it and decided to try to see if I could build an engine for as cheap as possible. I've all ready selected a flywheel in the form of an old steam valve handle.

This will be a interesting project to follow.

Cheers
Dennis

Looking forward to see this project progress.
Crazydoug

mounting hole on the oscillating cylinder is quite odd. .34 inches diameter (17/50) no threads, pinhole in the center goes all the way through.

If anybody can think of a better way of mounting the cylinder, tell me.

Why not cut a groove in the shaft to guide it.  You wouldn't have to make it very deep.

Here is the flat side.

So it is a double acting oscillator .
Your only choice is to thread the hole With what ever taps
 and dies you have and are comfortable with

That will depend on how much throw your piston rod has, and how much of that throw you choose to use by the amount of the off-center placement of your crank pin. Once you've decided on those basic parameters, the triangulation of your inlet and outlet holes will be set on the arc prescribed by the spacing of the ports in your cylinder, based from your pivot hole.