Sideshaft Vacuum Engine Plans

These are also known by some as "Fire Eaters" or "Flame Suckers" but technically, they are "Atmospheric" engines.

My unique valve mechanism operates from an oscillating side shaft. The engine is shown powered by one of my Mini Propane Burners (a separate plans set) at the front of the engine. You can run yours with an alcohol lamp if you like. A belt driven fan provides some air cooling, it also adds considerable interest to the engine. There is no ignition or carburetor to cause problems. The engine can operate from 200 RPM up to 3,000 RPM or more! As hot-air engines - not Stirling cycle - they are unusual in that they make a popping sound not unlike an internal combustion engine.

I built this engine in the late 80's.  It is easy to build, but it is small and has some small parts in it.  For a larger more refined "atmospheric" engine, see the "4-in-1" Vacuum Engine.

The plans set consists of 4 sheets of drawings and 1 sheet of construction and assembly notes.

Specifications:  Flywheel Diameter: 2-3/8", Cylinder Bore: .610", Piston Stroke: 7/8", Overall Length: 4-1/2"

Difficulty Level: Easiest (1...2...3...4...5...6...7...8...9...10) Hardest