Steam Machine (Pneumatic)

10,00  -Excl. Tax

A LEGO Technic steam machine powered by a 2-cylinder pneumatic engine, with valve gear mechanism, speed indicator and air control valve.


Video Presentation



  • Steam machine inspired by stationary engine
  • Double acting two-cylinder pneumatic engine with two valves (unmodified)
  • 90° angular offset between the two crankshafts
  • 5:1 gear ratio for the inertia wheel
  • Valve gear mechanism to reduce the switch deadspot time
  • Speed indicator using centrifugal force
  • Air control valve by pinching the input hose
  • Powered by 4-pump hand

You can read the full review of this model on my blog.


How to build ?

You can either purchase the PDF instructions only on this shop (no parts included) and build it with your own LEGO parts, or purchase the complete package including genuine LEGO parts plus PDF instructions, on Buildamoc shop

The instructions contain the partlist at the end, but you can check individually on Rebrickable.


About this product

Instructions preview

Building note

Please note that you need to have you own source or air (3 bar / 40psi). You can use :

  • 4x pump LEGO like this one
  • Use a LEGO compressor according to the specs
  • Use a electrical compressor like automotive compressor, industrial or electrical pump, you will need to put the air in the LEGO hose with . You can use a ball needle.
  • Use a hand pump with ball needle.
The switch has to have a smooth functioning/ To know if you switch is smooth enough to be used on this creation, you can build this building to test it : the wheel attached has to fall when you put the switch vertically. This is the configuration on the video, but it can also work with a less smooth switch (you have to help a little the wheel to start), but no more stiff. If you have hard switch, considering modify them.

Additional information

Model Size

38cm (L) x 23cm (W) x 20cm (H)


Black, Red, Yellow


All, Machine



Building Difficulty


Piece Count


Bill Of Material

Purchased File

PDF Instructions (About 203 pages / 123mo)