What does cylinder compression ratio mean?

[MacJude]

Cylinder compression ratio refers to the ratio of the total cylinder volume to the combustion chamber volume. Simply put, it is the ratio of the volume before compression to the volume of the compressed air-fuel mixture. Here are some methods to increase the compression ratio: 1. Change the connecting rod length: Lengthening the connecting rod raises both the bottom dead center and top dead center, reducing the combustion chamber volume and thereby increasing the compression ratio. 2. Modify the shape of the combustion chamber on the cylinder head. 3. Replace with a thinner head gasket or mill the cylinder block: This effectively increases the connecting rod length but may cause sealing issues. 4. Alter the shape of the piston crown.