VACUUM ENGINE


| May/June 1975


Box 246, Elfers, Florida 33531

The sketch of this tiny vacuum engine may be of interest to some of your readers. It is perhaps the simplest engine to build, having only one cylinder and one slide valve in contrast to a hot air engine with its displacer cylinder, etc. I have a hot air engine of 1 inch bore, the vacuum engine is also 1 inch-one would expect the hot air engine to have the most power since there is a push from the expansion of the hot air as well as the vacuum, but strange to say the vacuum engine has just as much 'power' although operating on vacuum only. It is fascinating to watch as it pops at every revolution, sounding like a little gas engine.

It is truly a mystery engine although the principle is that the hot gases are admitted to the cylinder through an open port on the outward stroke which is closed by the slide valve at about 95 degrees when the hot gases are supposed to cool, and create a partial vacuum pulling the piston back on the return of 'power' stroke. The mystery is that the hotter the cylinder, the faster the engine runs! In fact, if one wants to get a quick start, the cylinder has to be heated. It is also strange that the transition from hot to cold (in a hot cylinder) can be rapid enough to cause the engine to run at a high rate of speed, but it does!

I' BORE VACUUM ENGINE






SUBSCRIBE TO GAS ENGINE MAGAZINE TODAY!

Gas Engine Magazine A_M 16Gas Engine Magazine is your best source for tractor and stationary gas engine information.  Subscribe and connect with more than 23,000 other gas engine collectors and build your knowledge, share your passion and search for parts, in the publication written by and for gas engine enthusiasts! Gas Engine Magazine brings you: restoration stories, company histories, and technical advice. Plus our Flywheel Forum column helps answer your engine inquiries!

Be sure to take advantage of the Square Deal Subscription Program.

  • No Missed Issues.

  • No Renewal Notices.

  • No Additional Cost.

The Square Deal Subscription Program is designed as a paperless transaction with automatic renewals at a preferred low rate.   With advanced electronic notification, a 100% satisfaction guarantee and an easy opt-out plan, the Square Deal Subscription Program is the best value, risk free, eco-friendliest way to subscribe.




Facebook YouTube


Copyright 2018, All Rights Reserved
Ogden Publications, Inc., 1503 SW 42nd St., Topeka, Kansas 66609-1265