[Brick Technology] uses LEGO to gain some practical insight into the world of piston engine design, from single-cylinder all the way up to radial twelve-cylinder engines. Using pneumatic cylinders ...

The Technic kit ... air intakes. But alas, we're being too critical here. This is a kindler, gentler Technic kit aimed at younger audiences as "an introduction to engineering" as Lego describes ...

Air suspension works altogether differently, employing gas as a spring, as demonstrated by this simple Lego build from [JBRIX]. The suspension system is employed on a Lego Technic car ...