👉 A hydraulic engine is a type of internal combustion engine that uses hydraulic systems to power its pistons and cylinders. These engines are commonly used in vehicles, boats, and other machinery for their high efficiency and low noise levels. Hydraulic engines typically have two main types: reciprocating and centrifugal. Reciprocating engines use the principle of a piston moving up and down on an internal cylinder to supply power. Centrifugal engines, on the other hand, use a spinning disk or rotor