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What is the Compression Ratio of an Engine Related to?

2 Answers

StJoel

07/29/25 8:34am

Engine compression ratio is related to the maximum and minimum stroke volumes of the piston in the cylinder. The compression ratio refers to the comparison between the total cylinder volume before compression and after compression during the process of compressing the air-fuel mixture. When the piston stroke reaches its lowest position, it is called the bottom dead center, and when it reaches the highest point, it is called the top dead center. The compression ratio is the ratio of the maximum stroke volume to the minimum stroke volume. The automobile engine is the device that provides power for the vehicle, serving as the heart of the car, determining its power, fuel economy, stability, and environmental performance. Depending on the power source, automobile engines can be classified into diesel engines, gasoline engines, electric vehicle motors, and hybrid systems, among others.

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JulianaLynn

08/11/25 6:06pm

As a seasoned mechanic with years of experience in engine repair, I understand that compression ratio is no trivial matter—it's at the heart of engine design. The compression ratio is the ratio of the cylinder volume before and after compression, directly impacting combustion efficiency and power output. A high compression ratio requires high-octane gasoline; otherwise, it can lead to engine knocking and damage. In daily use, choosing the right fuel grade based on gasoline quality is crucial. Modern engines typically have compression ratios above 10:1, optimized for higher thermal efficiency and better fuel economy, but this increases cylinder pressure, necessitating stronger materials. I've also observed that increasing the compression ratio during car modifications can boost performance, though at the cost of higher maintenance expenses. In everyday driving, an excessively high compression ratio may cause cold-start difficulties, especially in winter, requiring longer warm-up times. Ultimately, balancing the compression ratio can extend engine life and reduce carbon buildup issues.

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