The correct terminology is "atmospheric engine".
But anyway, here is a "flame eater" engine you can build
any of four ways: (1) - Air Cooled Side Crank as shown, (2) -
Water Cooled Side Crank, (3) - Air Cooled Center Crank or (4)
- Water Cooled Center Crank!
The air cooled engines have an optional belt driven cooling fan
which provides cooling for long running sessions. The engine runs
fine without it. With the fan, the engine will run all day long
and never get hot. But long runs or not, the fan also adds much
interest to the engine.
All four versions use my oscillating (twisting) side shaft mechanism
to operate the head valve. My unique valve seat is of self lubricating
non-metallic material which greatly reduces valve sliding friction
and virtually eliminates wear. The engine speed range is from
60 to 600 RPM or so.
The engine can be ran on an alcohol flame, but for easy and
accurate speed control, use my Mini
Propane Burner on the "Book Shelf Models, Tools, Etc."
menu.
The plans set consists of 19 sheets of drawings and 2 sheets of
construction and assembly notes.
(1) 1.045" dia. x 1.5" long graphite for piston
(2) .250" x .500" x .187" thick ball bearings
(3) .156" x .312" flanged ball bearings for
fan hub and connecting rod end.