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Charts & Formulas

 

  • Cubic Inch Displacement:
    CID = bore x bore x stroke x 0.7854 x # of cylinders
  • Horsepower = (RPM x torque)/5,252
  • Torque = (5,252 x HP)/RPM
  • Valve Area = valve diameter x valve diameter x 0.7854
  • Rod Ratio = rod length/crank stroke length
  • Average Piston Speed = crank stroke x RPM/6
  • Rear Gear Ratio = (RPM at finish line x tire diameter)/(MPH x 336)
  • Volume (cc's) of Deck Clearance = bore x bore x 12.87 x depth of deck clearance
  • Volume (cc's) of Head Gasket = bore x bore x 12.87 x thickness of head gasket

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  • Compression Ratio = (comb chamber cc's + gasket cc's +deck CI cc's + (displacement x *2.0483)
                                                        comb chamber cc's + gasket cc's + deck CI cc's
               
                                            * = 2.0483 for 8-cyl    * = 2.7311 for 6-cyl    * = 4.0967 for 4-cyl

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  • Circumference = π x diameter
  • Area of Circle = π x radius x radius
  • Volume of a Cylinder = π x radius x radius x height

                    π = 3.1416

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Weights:

Oil 1 gallon = 7.0 pounds 1 quart = 1.75 pounds
Gas 1 gallon = 6.2 pounds 1 quart = 1.55 pounds
Water 1 gallon = 8.4 pounds 1 quart = 2.10 pounds

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Metric and Standard Conversion

The metric system is a decimal system of measurements used in scientific work for measuring length, weight, and volume. These basic units are modified with prefixes to express the units as larger or smaller quantities. Some of the common prefixes are:

Kilo: one thousand (1000)
Deci: one-tenth (0.1)
Centi: one-hundredth (0.01)
Milli: one-thousandth (0.001)
Micro: one-millionth (0.000001)

Length:

        1 Kilometer (km) = 1,000 meters = 3,280.83 feet = .6215 miles
        1 meter (m) = 100 centimeters = 39.37 inches = 1.09 yards
        1 decimeter (dm) = 3.937 inches
        1 centimeter (cm) = .3937 inches

        1 mile = 1.609 kilometers
        1 yard = .91 meters
        1 inch = 2.54 centimeters
        1 inch = 25.4 millimeters

Mass:

        1 kilogram (KG) = 1,000 grams (g) = 2.205 pounds
        1 pound = 453.6 grams
        1 gram = 1,000 milligrams (mg)
        kilograms x 2.20 = pounds
        1 ounce = 28.35 grams
        pounds / 2.20 = kilograms

Volume:

        1 liter (l) = 1,000 cubic centimeters (cc) = 61.025 cubic inches
        1 cubic inch = 16.387 cubic centimeters

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BOLTS AND TORQUE SPECS

 

U.S. BOLT GRADES

sae2 bolt sae5 bolt sae7 bolt sae8 bolt
SAE 2 SAE 5 SAE 7 SAE 8
  2 5 7 8 SOCKET HEAD CAP SCREW
I.D. Marks No markings 3 lines 5 lines 6 lines Allen head
Material Low carbon Medium-carbon, tempered Medium-carbon,
quenched & tempered		 Medium-carbon, quenched & tempered High-carbon, quenched & tempered
Tensile strength (Minimum) 74,000 psi 120,000 psi 133,000 psi 150,000 psi 160,000 psi

 

U.S. BOLT TORQUE SPECIFICATIONS
Torque in pounds-foot

    2 2 5 5 7 7 8 8 Socket head cap screw Socket head cap screw
Bolt Dia. Thread per inch Dry Oiled Dry Oiled Dry Oiled Dry Oiled Dry Oiled
1/4 20 4 3 8 6 10 8 12 9 14 11
1/4 28 6 4 10 7 12 9 14 10 16 13
5/16 18 9 7 17 13 21 16 25 18 29 23
5/16 24 12 9 19 14 24 18 29 20 33 26
3/8 16 16 12 30 23 40 30 45 35 49 39
3/8 24 22 16 35 25 45 35 50 40 54 44
7/16 14 24 17 50 35 60 45 70 55 76 61
7/16 20 34 26 55 40 70 50 80 60 85 68
1/2 13 38 31 75 55 95 70 110 80 113 90
1/2 20 52 42 90 65 100 80 120 90 126 100
9/16 12 52 42 110 80 135 100 150 110 163 130
9/16 18 71 57 120 90 150 110 170 130 181 144
5/8 11 98 78 150 110 140 190 220 170 230 184
5/8 18 115 93 180 130 210 160 240 180 255 204
3/4 10 157 121 260 200 320 240 380 280 400 320
3/4 16 180 133 300 220 360 280 420 320 440 350
7/8 9 210 160 430 320 520 400 600 460 640 510
7/8 14 230 177 470 360 580 440 660 500 700 560
1 8 320 240 640 480 800 600 900 680 980 780
1 12 350 265 710 530 860 666 990 740 1060 845

 

 

 

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