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Useful Formulas

  • Conversion 1 Liter = 61.02 Cubic Inches
  • HorsePower = TORQUE * RPM / 5252
  • HorsePower from MPH (1/4 mi.) = (.00426 * MPH)^3 * WEIGHT
  • HorsePower from MPH (1/4 mi.) = WEIGHT * (MPH/234)^3
  • HorsePower from ET (1/4 mi.) = WEIGHT * (5.825/ET)^3
  • ET from HorsePower (1/4 mi.) = (WEIGHT / HP)^.333 * 5.825
  • TORQUE = (5252 * HP) / RPM
  • CFM = (CID/2)*(RPM/1728)*VE
    VE = volumetric efficiency
    VE is approximately equal to 0.78 for stock engines, 0.85 for hi-perf street engine 
    and approx. equal to 0.97+ for full race engines.
    This gives rather low values for CFM but is probably all you really need.
    
  • Tire height (inches) = {[(section width * profile) / 2540] + (wheel diameter / 2)} * 2
  • 60 foot time from ET = (.12 * 1/4 mile et) + .17
  • MPH = Tire Radius / 168 * RPM / Trans Gear * Rear Gear
  • RPM = 168 * Trans Gear * Rear Gear * MPH / Tire Radius
  • GEAR RATIO = Tire Radius * RPM / 168 / MPH
  • Tire Radius = 168 * MPH * Trans Gear * Rear Gear / RPM
  • CID = Number Of Cylinders * Bore * Bore * Stroke
  • Volumetric Efficiency = Actual Engine Air Intake (CFM) / CID
  • Compression Ratio = Cyl. Volume @ BDC / Cyl. Volume @ TDC = 1 + (Swept Volume / Volume @ TDC) = 1 + (0.7854 * Bore * Bore * Stroke) / (CCV + HGV / PDV)

    CCV = Combustion Chamber Volume (in inches) = CC's / 16.4 HGV = Head Gasket Volume (in inches) = Compressed thickness * 0.7854 * Bore * Bore PDV = Piston Deck Volume = Volume of Piston Dish + Volume of Piston Dome

  • HorsePower = Atmos. Press. * CR * VE * CID * RPM / 5252 / 150.8


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