415 FORMULAS NEW PRODUCTS ADDED WEEKLY AT MOTORCYCLESTOREHOUSE.COM WIRE GAUGE SELECTOR It is important to choose the right wire diameter for the current that will flow through the wire. To choose the right gauge wire, you will need to know how much Watt (or Amperage) you will draw and what the length of the cable will be. Note: This selection table is based on a 12V system. For 6V systems the Amp. and Watt numbers should be divided in half to find the appropriate wire. Wire gauge Amp. Watt 3ft 5ft 7ft 10ft 15ft 5A 30W 18g 18g 18g 18g 18g 6A 36W 18g 18g 18g 18g 18g 7A 42W 18g 18g 18g 18g 18g 8A 48W 18g 18g 18g 18g 18g 10A 60W 18g 18g 18g 18g 16g 11A 66W 18g 18g 18g 18g 16g 12A 72W 18g 18g 18g 18g 16g 15A 90W 18g 18g 18g 18g 14g 18A 108W 18g 18g 16g 16g 14g 20A 120W 18g 18g 16g 16g 12g 22A 132W 18g 18g 16g 16g 12g 24A 144W 18g 18g 16g 16g 12g 30A 180W 18g 16g 16g 14g 10g 40A 240W 18g 16g 14g 12g 10g 50A 300W 16g 14g 12g 12g 10g 100A 600W 12g 12g 10g 10g 6g 150A 900W 10g 10g 8g 8g 4g 200A 1200W 10g 8g 8g 6g 4g WIRE GAUGE CONVERTER The American AWG (American Wire Gauge) system can be somewhat puzzling when thinking in millimeters. Check out the AWG to Metric conversion table below. Note: Dimensions are plain wire with insulation is removed. Millimeters sizes mentioned are rounded off for convenience sake. Gauge mm² ømm 22 0.33 0.65 20 0.5 0.8 18 0.8 1.0 16 1.0 1.3 14 2.0 1.7 12 3.0 2.1 10 5.0 2.6 8 8.0 3.3 6 13.0 4.1 4 19.0 5.2 2 32.0 6.5 0 52.0 8.3 FLUIDS Gallon (US) x 3.7854 = Liter Quart (US) x 0.9464 = Liter Fluid ounce x 29.57 = Cubic centimetres (cc) Imperial Pints x 0.568 = Liter LENGTHS / DISTANCE Inch (in) x 25.4 = Milimeter (mm) Inch (in) x 2.54 = Centimeter (cm) Foot (ft) x 0.305 = Meter (m) Yards (yd) x 0.9144 = Meter (m) Miles (mi) x 1.609344 = Kilometer (km) WEIGHTS Pounds (lb) x 453.6 = Grams (gr) Pounds (lb) x 0.4536 = Kilograms (kg) Ounces (oz) x 28.3495 = Grams (gr) PRESSURE PSI = Pound-force per square inch atm = Atmospheres kPa = Kilopascal PSI x 0.0689 = Bar PSI x 0.0698 = atm Bar x 14.5038 = PSI Bar x 1.013 = atm atm x 0.987 = Bar kPa x 0.01 = Bar POWER Horsepower (hp) x 0.7457 = Kilowatt (kw) TORQUE - P ounds-force inches x 1.152 = Kilogram-force centimetres (kgf cm; kg cm) - P ounds-force inches x 0.113 = Newton Metres (nm) - P ounds-force inches x 0.083 = Pounds-force feet (ft-lbs) - P ounds-force feet (ft-lbs) x 0.138 = Kilogram-force centimetres (kgf cm; kg cm) - P ounds-force feet (ft-lbs) x 1.356 = Newton metres (nm) - N ewton metres (nm) x 0.102 = Kilogram-force metres (kgf m; kg m) - K ilogram-force metres (kgf m; kg m) x 9.804 = Newton metres (nm) ENGINE CAPACITY Cubic inches (cu.i) x 16.38807 = Cubic centimetres (cc) Cubic centimetres (cc) x 0.06102 = Cubic inches (cu.i) FUEL CONSUMPTION Miles per Gallon (mpg) x 0.425 = Kilometres per Liter (km/l) TEMPERATURE Degrees Celsius (°C x 1.8) + 32 = Degrees Fahrenheit (°F) Degrees Fahrenheit (°F -32) x 0.56 = Degrees Celsius (°C) It's a good thing to know what you're doing or what you're talking about. Knowledge is a key factor and may even help you save a fortune, or your credibility, when wrenching or ordering parts. Following is a listing of most used calculations and conversion factors. They may be helpful to you when working around Harley-Davidson® and custom motorcycles. DISPLACEMENT Bore" x Bore" x Stroke" x 1.5708 = Displacement in Cubic Inches. Bore" x Bore" x Stroke" x 25.744019 = Displacement in Cubic Centimetres Example: A stock 1340cc Evolution Big Twin has a bore of 3 1/2" and stroke of 4 1/4". Formula: 3.5" x 3.5" x 4.25" x 1.5708 = 81.78 Cu.I. 3.5" x 3.5" x 4.25" x 25.744019 = 1340.29 cc AREA OF A 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 1340cc Evolution Big Twin has a bore of 3 1/2" Formula: 1.75" x 1.75" x 3.1416 = 9.62 Inch² 44.45 mm x 44.45 mm x 3.1416 = 6207.18 mm² (62.0718 cm²) HEAD/BASE GASKET VOLUME Bore x bore x 12.87 x compressed gasket thickness = Gasket volume in cubic centimetres Example: A head gasket has a thickness of 0.045", bore is 3 5/8" Formula: 3.625" x 3.625" x 12.87 x .045" = 7.61 cc SURFACE AREA - INCHES TO METRIC & METRIC TO INCHES Inch² x 6.45 = cm² cm² : 6.45 = Inch² Feet² x 929 = cm² cm² : 929 = Feet² Feet² x 0.0929 = m² m² : 0.0929 = Feet² Yard² x 0.836 = m² m² : 0.836 = Feet² Acre x 4046.8564 = m² m² : 4046.8564 = Acre Acre x 0.4046 = Hectare Hectare : 2.4711 = Acre ELECTRICAL: AMPERAGE, WATT & VOLTS Electrical current can be important to prevent a melt down within the electrical wiring of the motorcycle, or 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 COMPRESSION RATIO Cylinder displacement + combustion chamber volume, divided by combustion chamber volume. Example: A 1340 cc Big Twin has 670 cc per cylinder. Combustion chamber volume is 72 cc. Formula: 670 + 72 = 742 : 72 = 10.3:1 Compression Ratio (CR) Note: Do not forget to include gasket thickness and valve pockets in the piston when calculating CR. CC-ing the heads (filling with fluid after heads have been installed and piston fluid tight sealed) will give accurate numbers. ELECTRICAL WIRING FORMULAS CONVERSION FACTORS
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