Displacement = bore2 x stroke x .7854 x # of cylinders
RPM = mph x axle ratio x 336 x transmission gear ratio / loaded tire diameter
MPH = (rpm x 60) / (axle ratio x tire revolutions per mile)
Tire Revs Per Mile = 10084 / loaded tire radius
Carburetor CFM Requirements = displacement x redline rpm x volumetric efficiency (90%, or .9 for a good street car) / 3456
Coil Spring Rate = (W x G) / (8 x N x D) where:
W = wire diameter (in.)
G = 12,000,000
N = number of free coils* + 0.5
D = diameter of spring coil (from center to center of wire)
* "free coils" is the number of coils in the spring which don't touch the mount. Generally, the top and bottom coils aren't counted as "free coils".
Skidpad performance: g = (1.225 x R) / (T x 2) where:
g = lateral acceleration force (in percentage of one gravity)
R = radius of circle competed
T = time in seconds to complete circle
If there are errors or any more formulas you'd like to
see on this list, or any that you may already have and would
like me to post, feel free to e-mail me.
