The cyclone engine is an advanced external combustion engine capable of running on various fuels, including biofuels, while emitting significantly fewer pollutants than internal combustion engines. Its operation is based on a Rankine cycle, utilizing water as both the working fluid and lubricant, and is designed to be more eco-friendly and efficient with a reduced number of components compared to traditional engines. The engine has potential applications across a wide range of industries, from small appliances to large marine propulsion systems, and offers advantages such as lower emissions, quieter operation, and reduced operating costs.