1802 FORMULAS DISPLACEMENT Bore x bore x stroke x 1,5708 = Displacement in Cubic Inches Bore x bore x stroke x 25,744019 = Displacement in Cubic Centimeters Example: A stock 96”Twin Cam has a bore of 3,750” and a stroke of 4,375”. Formula: 3,750” x 3,750” x 4,375” x 1,5708 = 96,64 cubic inch 3,750” x 3,750” x 4,375” x 25,744019 = 1583,86cc COMPRESSION RATIO Ratio = Cylinder displacement plus combustion chamber volume divided by combustion chamber volume. Example: A 96” cubic inch Twin Cam has 794cc per cylinder. Combustion chamber volume is approximately 86cc. Formula: 794 + 86 = 880 : 86 = 10,2:1 Compression Ratio (CR) Note: When calculating compression ratio, do not forget to include gasket thickness, valve pockets and ringlands in the piston. CC-ing the heads, filling them with fluid after heads have been installed, will give you accurate numbers. HEAD/BASE GASKET VOLUME Bore x bore x 12,87 x compressed gasket thickness = Gasket volume in cubic centimeters Example: A head gasket has a thickness of 0,045”; bore is 3,750”. Formula: 3,750” x 3,750” x 12,87 x 0,045” = 8,144cc AREA OF CIRCLE The radius is the diameter of a circle divided in half. Radius x radius x 3,1416 = Area of a circle Example : A stock 96”Twin Cam has a bore of 3,750”. Formula: 1,875” x 1,875” x 3,1416 = 11,05 Inch2 47,63 mm x 47,63 mm x 3,1416 = 7127,09 mm2 (71,271 cm2) ELECTRICAL: AMPERAGE,WATT AND VOLTS Understanding electrical current is important to prevent a meltdown within the electrical wiring of a motorcycle. It is useful to calculate what fuse you will need for a certain application. Watt divided by Volt = Amp Amp multiplied by Volt = Watt Watt divided by Amp = Volt
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