It depends on the geometry of the cylinder, including the bore and stroke, as well as the combustion chamber design. The compression ratio of a cylinder is not determined solely by cylinder pressure (PSI). What is the compression ratio of a cylinder pressure? Divide the volume at BDC plus the clearance volume by the volume at TDC. How do you find the compression ratio of a cylinder?Īs mentioned earlier, you find the compression ratio of a cylinder by measuring the cylinder volume at BDC and TDC. The PSI value for a 10:1 compression ratio depends on the atmospheric pressure and the specific conditions, but as a rough estimate, it might be around 160-180 PSI for a naturally aspirated gasoline engine. The cylinder volume at BDC can be estimated as the swept volume of the cylinder (cylinder bore area times stroke length), and the clearance volume is the volume of the combustion chamber when the piston is at TDC. The formula for calculating compression ratio is:Ĭompression Ratio (CR) = (Cylinder Volume at BDC + Clearance Volume) / Cylinder Volume at TDC It's determined by comparing the volume of the cylinder when the piston is at its bottom dead center (BDC) to the volume of the cylinder when the piston is at its top dead center (TDC). The compression ratio (CR) of an engine is not directly calculated from PSI (pounds per square inch) alone. How do you calculate compression ratio from PSI? Cylinder Pressure to Compression Ratio Calculator Enter PSI: Calculate
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