Formulas for Various Computations
Key;
* Pi = 3.14159
* F = Degrees Farehenheit
* C = Degrees Celsius (Centigrade)
* R = radius ( When preceeded by degrees F or degrees C, it refers to Absolute temperature [Rankin])
* D = Diameter
Weights:
* 1 Gallon of Oil = 7.0 lbs.
* 1 Gallon of Water = 8.354 lbs. @ 60 deg.F.
* 1 Gallon Gasoline = 6.2 lbs @ 60 deg.F.
* 1 Gallon Alcohol = 6.616 lbs @ 60 deg.F.
* 1 Gallon Nitro = 9.505 lbs @ 60 deg.F.
Conversions;
* Cubic Inches to Gallons = Divide by 231
* Gallons to Cubic Inches = Multiply by 231
* Cubic Inches to Ounces = Multiply by .554
* Ounces to Cubic Inches = Divide by .554
*
* Cubic Centimeters to Cubic Inches = Multiply by .06102
* Cubic Inches to Cubic Centimeters = Multiply by 16.39
Circles:
* Area of a Circle = Pi x R ^2 (3.14159 x R^2)
* Area of a Circle = .7854 * D
*
* Circumference of a Circle = 2Pi x R (6.2832 x R)
* Circumference of a Circle = Pi x D
Temperature:
* Absolute Zero = -459.7 deg. F.
* Absolute Zero = -273.2 deg. C.
*
* Absolute Temperature deg. F. = deg. F. + 459.7 ( May be rounded to -460)
* Absolute Temperature deg. C. = deg. C. + -273.2 (May be rounded to -273)
Jet Change for Fuel Injection
* New Air Density - A
* Old Air Density - B
* Current Jet.... - C
* Formula; (A-B)/ (B) x 100 = % Change in Density
* Sqrt(((C/2)^2(PI)(-(A-B)/(B))/(C/2)^2(PI))/(PI))x2 = New Jet Size.
Fuel Delivery in GPM @ RPM
Lbs.Fuel @ RPM
--------------
Weight of 1 Gallon Fuel.
Lbs Fuel @ RPM
Lbs. Air@RPM
------------
Desired A/F Ratio
Lbs Air@RPM
CFM @ RPM x Weight of 1 cu.Ft Air
Weight of 1 Cu.Ft. Air
1.326 x Barometer

Rankine= Temp Deg F +460