Building a LEGO Pneumatic Machine with Variable Valve Timing

🔽 A LEGO Pneumatic Switchless Machine with adjustable timing, working throttle with idle mechanism, openable controls panel and building instructions. 🔽

This engine is a custom creation of my own. Build around a single pneumatic cylinder, with air distribution using custom valves. The switchless valves are composed of 2 hose loops by cylinder chambers, which are operated by pushers with a single camshaft, enabling to pinch the hose to restrict the air flow. It's switchless in the sense that it doesn't use the official LEGO switch. In LEGO lingo this is called a switchless mechanism, not to say it doesn't have a switch, but to say it didn't use a LEGO switch metapiece.

The whole valve assembly can rotate around the camshaft, enabling a rotation angle offset between the camshaft assembly and the crankshaft, in order to adjust precisely the timing (ignition point of internal combustion engine). The yellow wheel on the front panel controls the timing angle, with a visual indicator as the yellow connector.

The model is also equipped with working throttle, which works on the same principle as the switchless valve, by using a pinched loop to restrict the air flow. It is operated by linkage which is connected to the red throttle. Then, a idle mechanism, which acts as a adjustable endstop enables to set up the idle of the engine, which is operated by the red wheel.

To finish, the control panel can be open to see the internal mechanism.

📲 Building instructions, review, pictures : https://www.nico71.fr/product/switchl...

📐 Dimensions : 26cm (L) x 17cm (W) x 19cm (H)

00:00 : Building the Engine
02:32 : First Run (1.5 bars)
02:58 : Throttle Assembly and Idle Mechanism
03:44 : Second run (1.5 bars)
04:04 : Timing Mechanism and Controls Panel
05:20 : Model Presentation
05:52 : Third Run (2 bars)
06:57 : Lowest Possible Speed
07:37 : Last Run : Max speed, 4 bars
07:51 : Building Instructions Previews
08:01 : Outro

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📕 Review and building instructions : https://www.nico71.fr/