this is my lego vacume engine one cylinder how to make it link- www.dansworkshop.com

This is another Lego engine I made that is powered by a vacuum cleaner, a little like my older engine. It has a much larger piston (8 Lego dots x 8 lego dots x 7 brick heights) which equates to a swept volume of about 275cc. The valve is 2 lego dots by 6 lego dots by 1.3 brick heights. There is alot of friction in this engine and the piston was a little too large for an engine made out of lego. Running the vaccum cleaner too high would cause the connecting rod to be pulled off of the rod connected to the piston if the engine ran too fast. In hind sight I would have made 2 cylinders with 2 valves each 90 degrees out of phase with the other so as to encourage smooth power delivery much like my previous engine.

A clip of my big Vacuum Engine running. Bore 50mm, stroke 90mm, water cooled. Drawings are available for sale. Pleas feel free to contact me for more information.

This is an Air-Cooled vacuum engine designed by Dr. JRSenft. I found the plans in the November 1980 edition of Live Steam. I built this over the last few months and it is fun to watch it run. It is lubricated with Extra Fine Graphite powder to lessen friction. The fuel in the copper burner is alcohol.

Thanks to Anthony Liekens for his instructions. Have any suggestions as to how I should expand this?