Steam will eventually need to exit the engine, so a simple collection header block was fabricated from a huge chunk a bronze I had laying around. The “used” steam will then be piped forward to the smoke box in front of the boiler and directed upwards through the smoke stack. This will produce a venturi effect that pulls hot gases through the boiler, thus helping to heat the water and make more steam. Simple as that!

The completed bronze exhaust manifold is mounted to both exhaust ports on the cylinders with a gasket in between each.

 

I began by face milling each side to square it up and finishing the ends with an end mill for a total length of 7″.

 

Next, I clamped the manifold upright and drilled a hole halfway through. Then I flipped it and drilled again to create single hole that runs the entire length.

 

The manifold outlet hole was drilled in the bottom which intersects the lateral hole in the center.

 

All three holes were then tapped 1/4″ NPT.

 

The manifold was turned on it’s side to drill the exhaust flange holes. This is where the manifold will meet the cylinders.

 

The completed exhaust manifold minus two brass 1/4″ NPT plugs that will go into the ends to close it up.