Calculated accuracy of current Javascript enabled browsers is generally 16 places. Cranking Compression Calculator Number of Cylinders : Bore in Inches : Stroke in Inches : Rod Length in Inches : Static Compression Ratio : (:1). To do another, click the Clear Values button and then enter a new set of values. For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.51.3 ×. This returned value for volume should be measured with the piston at top dead center, with all valves closed and with the head gasket installed, or, Calculate Combustion Chamber Volume from ALL input values except Combustion Chamber Volume and Total Volume by entering the required values and clicking on the proper Calculate button. You can also calculate Total Volume from bore, stroke, and CR. Thanks 2 cmonson Veteran Member 4,134 Calgary, Alberta No. The value will be returned in CR, Compression Ratio from ALL input values excluding Total Volume. 1 N nagrom28 Veteran Member 375 Wilton, Iowa Is it possible to tell approximate compression ratio by the psi the engine makes while cranking My 454 makes 180 psi on all eight cylinders and I'm curious what the compression ratio would be. Enter the measurement designation in either inches, 1, or millimeters, 2. Enter the measurement designation in either inches, 1, or millimeters, 2. Engine Compression Ratio (CR) Calculator This calculator requires the use of Javascript enabled and capable browsers. This calculator requires the use of Javascript enabled and capable browsers. This document requires JavaScript enabled browsers verify that yours is capable and perhaps only turned off.
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