Friday, August 1, 2014

Weekend Steam: One For The Kitchen Table

The Stuart Mill Engine and a few other of the small Stuart engines are available as machined kits, so anyone can have a little steamer to play with on cold winter nights. 


6 comments:

Anonymous said...

Years ago I seem to remember seeing "conversion kits" to make small gas engines run on steam. It seems to me it would not work well, but... Have you ever seen such a thing?

Merle

David aka True Blue Sam said...

A fellow student from my hometown converted a Briggs engine when he was in the ninth grade. The major change was building up two extra lobes on the camshaft so the intake and exhaust opened every revolution. It ran well on compressed air. He did it himself in his dad's workshop. He was one of those quiet genuiuses that is ignored by everyone else as they go through school. He does refrigeration and electrical work all over southeast Iowa.

Anonymous said...

I suspected that steam would cause big problems with washing the lube out of the cylinder walls, but there SHOULD be a way to inject some.

Merle

David aka True Blue Sam said...

The little brass thing he was adding oil to is a displacement lubricator. Steam condenses, falls to the bottom, and oil floats out to the steam chest. Steam engines originally used tallow to lube the cylinder, but tallow wouldn't stand up to high pressure steam. Some bright person tried mixing tallow with mineral oil, and Voila!!!, Steam Cylinder Oil was invented. That is what is still used today, so the oil mixes with the steam and keeps the cylinder, piston, and rings slick. As water drips out of the petcocks it is a milky color because the steam cylinder oil is emulsified in the water.

Anonymous said...

OK, thanks for the info. It seemed that someone smarter than me had figured it out a long time ago, but I just couldn't see how it would work in a converted gas engine.

Merle

David aka True Blue Sam said...

It would be a problem in a closed crankcase system, and I don't know how that is handled. If the crankcase were kept hot, then the water that slips past the rings would evaporate out. I am guessing that the bearings were lubed with a total loss system even in closed crank cases to avoid having water contaminate the lube oil for the bearings. Anyone with experience, please jump in!