The Lego Pneumatic Beam Engine

A great love of mine, is to build Lego pneumatic engines. If you check YouTube you’ll see that tons of other people also enjoy building them. It’s like building a real engine but running it off of compressed air. When I was little I used to go to Steam Rallies and Steam has always interested me.

So after playing around I managed to build a working pneumatic beam engine.


This is one of my favourite mocs, I can watch it for ages. It can be a bit temperamental, though.


Random Pneumatic Creations

As mentioned in my Beam Engine post I have always been interested in Lego Pneumatics. Over the years I have made some creations which I thought I would share with you.

One of the first things I tried to make was a motorized pneumatic switch using an old style 9v motor. It uses the spring from the Lego Technic hockey players to re-center the value.

I also had a go at making my own pneumatic single piston engine however, I went a bit further and build a Lego compressor to power it. This was great fun!

After the beam engine (post found here) I had a go at making a pneumatic train that works like a real steam train. This requires a lot more pressure than the single piston engine above however does not require a flywheel.