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Latest revision as of 19:40, 13 September 2019
Car Info General
 Conversions
Length Millimeters to Inches x .03937 Inches to Millimeters x 25.4 Centimeters to Inches x .3937 Inches to Centimeters x 2.54 Kilometers to Miles x .6214 Miles to Kilometers x 1.609 Meters to Feet x 3.281 Feet to Meters x .3048
Weight Kilograms to Pounds x 2.205 Pounds to Kilograms x .4535 Grams to Ounces x .03527 Ounces to Grams x 28.35
Volume cc’s to cu. in. x .06102 cu. in. to cc’s x 16.388 Liters to Gallons x .2642 Gallons to Liters x 3.785 Liters to Quarts x 1.057 Quarts to Liters x .946 Milliliters to fl. oz. x .03381 fl. oz. to Milliliters x 29.58
Torque Kilogram Meters to ft. lbs. x 7.233 ft. lbs. to Kilogram Meters x .1383 ft. lbs. to Newton Meters x 1.356 Newton Meters to ft. lbs. x .737 kgm to Nm x 9.807 Nm to kgm x .102
Other Metric Horsepower (ps) to Brake Horsepower (bhp) x .9863 Brake Horsepower (bhp) to Metric Horsepower (ps) x 1.014 Kilowatts (kW) to Metric Horsepower (ps) x 1.360 Metric Horsepower (ps) to Kilowatts (kW) x .7355 Kilometers per Liter (km/l) to Miles per Gallon (mpg) x 2.352 Miles per Gallon (mpg) to Kilometers per Liter (km/l) x .4252 Spring Rates (kg/mm) to Pounds per Inch (lbs./in.) x 56.01 Kilopascals (kPa) to Pressure (psi) x .1450 Pressure (psi) to Kilopascals (kPa) x .0703 Pressure (kg/cm²) to Pressure (psi) x 14.22
General Formulas
Rod Ratio = Rod Length/Stroke
Torque = (HP x 5252)/RPM
Horsepower (HP) = (Torque x RPM)/5252
Volumetric Efficiency (VE) = (HP x 5600)/(RPM x Disp.)
Brake Mean Effective Pressure (BMEP) = (HP x 792000)/(Disp. x RPM) BMEP measured in psi
Average Piston Speed (APS) = (Stroke x RPM)/6 APS measured in ft/min.
Piston Acceleration (PA) = (RPM ² x Stroke/2189) x (Stroke/(2 x Rod Length) + 1)
Maximum Ring Thickness = APS/PA
Redline = (APS x 6)/Stroke
Swept Volume (SV) = Bore ² x Stroke x 0.7854 SV = Single Cylinder Displacement
Displacement (Disp.) = Bore ² x Stroke x 0.7854 x # of Cylinders
Compression Ratio = (SV + CCV)/CCV CCV = Combustion Chamber Volume
Head Gasket Volume (GV) = Bore ² x .7854 x Gasket Thickness Multiply by 16.387 for cc’s
Net CCV = CCV + GV
Cylinder Bore = √(Disp./(.7854 x # of cyl. x Stroke))
Intake Formulas
Intake Tract Tuning for RPM = (1100 x Half Intake Cam Duration x 0.960)/Length = 2nd Pulse (1100 x Half Intake Cam Duration x 0.705)/Length = 3rd Pulse (1100 x Half Intake Cam Duration x 0.538)/Length = 4th Pulse
Intake Tract Tuning for Length = (1100 x Half Intake Cam Duration x 0.960)/RPM = 2nd Pulse (1100 x Half Intake Cam Duration x 0.705)/RPM = 3rd Pulse (1100 x Half Intake Cam Duration x 0.538)/RPM = 4th Pulse
Exhaust Formulas
Mean Flow Velocity = (APS/60) x (Bore²/Exhaust I.D.²) MFV measured in ft./sec., Ideal is 280 – 300
Sonic Wave Scavenging for RPM = (950 x EX)/Length; EX = Exhaust Open # + 180° SWS for 50” or less header for top end power
Sonic Wave Scavenging for Length = (950 x EX)/RPM
Thermal Wave Scavenging for RPM = (1380 x EX)/Length; EX = Exhaust Open # + 180° TWS for 51” or longer header for low end power
Thermal Wave Scavenging for Length = (1380 x EX)/RPM
Cam and Valve Train Formulas
Duration = Cam Open + Cam Close + 180°
Overlap = Intake Open + Exhaust Close More overlap for high end power, less overlap for low end power
Lobe Centerline = (Duration/2) – Smallest #
Lobe Separation Angle = (Intake Lobe Center + Exhaust Lobe Center)/2