LEGO Pneumatic Fake Engines

A LEGO Pneumatic Fake Engine (LPFE) is a LEGO engine which uses LEGO Fake Engines for the piston-cylinder assembly and sometimes uses a non-LEGO Schrader valve to control the airflow in and out in a two-stroke cycle.

Notable Examples
Among the TBLE community, a Youtuber by the name of Shpakproof was one to develop the LPFEs and made use of Schrader valves. It has not yet been achieved to design a LEGO air-powered engine with fake engine parts without modifying the LEGO or sourcing parts from outside the LEGO system.