Engine Data Explanation
Calculate your Engine's Compression Ratio Here. Fill out the required fields and you will see the magic. If you want to see what a sample
calculation looks like hit the "Sample" button. Below is a description of each field of data -
Number Of Cylinders - Number of Pistons in your Engine
Bore - Engine Bore in Inches
Stroke - Engine Stroke in Inches
Chamber Volume - Cylinder Head Combustion Chamber Volume in CC
Head Gasket Thickness - Compressed Head Gasket Thickness in Inches
Head Gasket Bore - Bore size of the Head Gasket in Inches
Piston To Deck Height - Positive number is below the deck, Negative Above in Inches
Piston Type -
Dished - Dome Volume is Subtracted
Flat Top - Dome Volume is Subtracted
Domed - Dome Volume is Added
Dome Volume - The Dome Volume as described above for each piston in CC
The Dome volume includes Dish, Valve Relief. For Example if you have a Flat Top Piston with valve reliefs the Dome Volume
would what is cut out for the valve.
If a Domed piston with valve relief the total dome volume would be the Dome MINUS Valve Relief.
For a Dished Piston the Dome Volume would the the total negative volume. All data is entered as a POSITIVE Value and the
Piston type will determine how the number is used.