What is the purpose of grooves and lands on a piston?

The purpose of grooves and lands on a piston is to properly space and secure the piston rings in place. The grooves are specifically designed to accommodate the piston rings, allowing them to fit snugly and function effectively. This arrangement is crucial for maintaining proper sealing in the combustion chamber, which prevents the escape of gases and maintains engine efficiency. The lands, which are the raised areas between the grooves, help provide a strong sealing surface and contribute to the overall structural integrity of the piston. This function is essential for optimal performance and durability of the engine, ensuring that it operates smoothly and efficiently.