ATTENTION: These pages were created & copyrighted by Steve Parker. They
reside here on MonteCarloSS.com only until we can contact Steve to get his
site back up in operation.
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