Calculates the compression ratio and the resulting pressure in pounds per square inch (PSI) of an engine, given the bore, stroke, head volume, and deck clearance.
Start with your values, or try a preset.
Enter Bore (inches), Stroke (inches), Head Volume (cc), Deck Clearance (cc), Gasket Volume (cc), and Atmospheric Pressure (PSI) in the units shown.
Read Compressed Volume (cc), Cylinder Volume (cc), Total Volume (cc), Compression Ratio, and Pressure (PSI) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Bore (inches): 4 in; Stroke (inches): 3.75 in; Head Volume (cc): 70 cc; Deck Clearance (cc): 10 cc; Gasket Volume (cc): 12 cc; Atmospheric Pressure (PSI): 14.7 psi
Compressed Volume (cc): 92 cc; Cylinder Volume (cc): 772.21853 cc; Total Volume (cc): 864.21853 cc; Compression Ratio: 9.393679673; Pressure (PSI): 138.0870912 psi
Bore (inches): 3.9 in; Stroke (inches): 3.4 in; Head Volume (cc): 65 cc; Deck Clearance (cc): 5 cc; Gasket Volume (cc): 10 cc; Atmospheric Pressure (PSI): 14.7 psi
Compressed Volume (cc): 80 cc; Cylinder Volume (cc): 665.575151 cc; Total Volume (cc): 745.575151 cc; Compression Ratio: 9.319689387; Pressure (PSI): 136.999434 psi
Bore (inches): 3.5 in; Stroke (inches): 3 in; Head Volume (cc): 50 cc; Deck Clearance (cc): 0 cc; Gasket Volume (cc): 8 cc; Atmospheric Pressure (PSI): 14.7 psi
Compressed Volume (cc): 58 cc; Cylinder Volume (cc): 472.9838496 cc; Total Volume (cc): 530.9838496 cc; Compression Ratio: 9.154893959; Pressure (PSI): 134.5769412 psi
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