|Sideshaft Vacuum Engine
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
I built this engine 25 years ago. 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 below.
The plans set consists of 4 sheets of drawings and 1 sheet of
construction and assembly notes.
Flywheel Diameter: 2-3/8", Cylinder Bore: .610", Piston Stroke: 7/8",
Overall Length: 4-1/2" Experience
(1) Graphite rod to make piston, (2) 3/16" ID x 3/8" OD x 1/8" thick
precision ball bearings. Materials
set sold separately.
for the great tips on your web site. I have ordered plans from you in
the past, great quality, prices more than reasonable. Keep up the good
work." - Mike Nay (West Valley City, Utah)