What is the compressor retio?

The compressor ratio, or compression ratio, is the ratio of the maximum to minimum cylinder volume in an engine or compressor during the intake and compression cycles. It indicates how much the air-fuel mixture is compressed before combustion or compression occurs. A higher compression ratio generally leads to greater efficiency and power output, but it can also increase the risk of engine knock or detonation. The specific ratio can vary widely depending on the design and purpose of the engine or compressor.