This calculator will compute the deck clearance for above or below deck applications.įind the engine displacement based on stroke and cylinder measurements. Use this calculator to get the approximate piston compression height. Using this calculator, you can obtain the proper ring end gap requirements for KB Pistons using end gap factors from inside the front cover of the KB catalog or on this website in the tech article titled "Special Clearance Requirements for the KB Piston." This calculator will give you the proper piston head volume with a known compression ratio.Ĭonvert inches to millimeters or millimeters to inches. (considers cam timing and rod ratio) This calculator will give you a dynamic compression ratio taking into account cam timing and rod ratio. It will also estimate a dynamic effective compression ratio taking into account the cam timing and rod ratio. (considers cam timing and rod ratio) This calculator will give you the proper compression ratio with a known piston head volume. When this happens the valve reliefs and the pop-up are approximately equal in value. On the piston calculator many times you will come up with a piston head volume that approaches zero. If you do not have the exact gasket bore use the cylinder bore in its place. With some pistons this flat area may be very small (example: Chrysler Hemi is only a line at zero deck). Do not measure to the top of the pop-up or the bottom of a dish. Deck Clearance.Deck clearance should be measured from the top of the block to the flat portion of the piston.Located above each picture in the KB Catalog is the value for the piston head volume shown in positive or negative numbers. In this example, the bore (4.600in) and exposed cylinder 1.5in equals 40.9 cc. Pistons with a dish or pistons below deck increase chamber volume and receive a positive value. Volume () x (bore radius squared) x (exposed cylinder height).
Pistons with pop-ups or pistons sticking out above the deck will reduce chamber volume and will usually require a negative number. Negative numbers indicate a reduction in cylinder head volume.
Values for Piston Head Volume and Deck Clearance can be entered as both positive or negative values.
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