The Garage 54 YouTube channel from Novosibirsk has once again attracted public attention with its innovative project: they have constructed an engine in which the pistons and cylinders have a square shape.
To achieve high precision in processing the combustion chamber, the team resorted to using electrical discharge machining equipment. To ensure smooth operation when heated, the pistons were made with a slight taper, and rubber rings were used to ensure tightness, as traditional compression rings are not able to work effectively in angular surfaces.
Insufficient compression prevented the engine from starting on the first attempt. After improvements, including grinding and sealing, the engine started and even transmitted torque to the wheels, but with heavy smoke, tire overheating, and piston wear. The experiment, although useless, clearly showed why cylinders are made round: the square shape creates stress concentration, impairs heat dissipation and sealing.
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