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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 kg-m to N-m x 9.807 N-m to kg-m 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