A »A variable compression ratio engine dynamically adjusts its compression ratio to optimize performance and efficiency. By changing the volume of the combustion chamber, it can switch between higher ratios for efficiency during light loads and lower ratios for power under heavy loads. This adaptability helps improve fuel economy and reduce emissions while maintaining performance, making it a versatile choice for modern vehicles.

A »A variable compression ratio engine adjusts its compression ratio by altering the piston's stroke length, typically using a multi-link system. This allows the engine to optimize efficiency and performance across different driving conditions, such as switching between high compression for fuel efficiency and low compression for high power output.