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Calculate Throttle Body Size Based on Bore, Stroke and Number of Cylinders

Bore: inches

Stroke: inches

Number of Cylinders:

Best Power Rpm: This is the rpm at which you want your engine to produce the most horsepower.

Throttle_body_1
=


Calculate Throttle Body Size Based on Cubic Inches

Cubic Inches:

Best Power Rpm: This is the rpm at which you want your engine to produce the most horsepower.

Throttle_body_2
=


Calculate Throttle Body Size Based on Liters

Liters:

Best Power Rpm: This is the rpm at which you want your engine to produce the most horsepower.

Throttle_body_3
=


Calculate Horsepower by Weight and Elapsed Time

Weight of Car in Pounds (lbs):

E.T. (Elapsed Time):

Horsepower = (weight of car)(5.825)3 / (E.T.)3 =


Calculate Horsepower by Weight and Speed

Weight of Car in Pounds (lbs):

Speed at the end of the 1/4 mile in mph:

Horsepower = (weight of car)(miles per hour3) / 2343 =


Calculate Best Possible E.T. (Elapsed Time) by Weight and Horsepower

Weight of Car in Pounds (lbs):

Horsepower:

Et_by_weight_and_hp

=



Typical E.T.'s in real racing and on HiPerMath are 1 second higher (slower) than the Best Possible E.T. given here.


Calculate MPH (Miles Per Hour) at End of 1/4 Mile by Weight and Horsepower

Weight of Car in Pounds (lbs):

Horsepower:

Mph_by_weight_and_hp

=





Calculate Rear End Gear Ratio (also known as Final Drive)

Tire Diameter in inches: (use the diameter of the tire that puts power to the ground)

Rpm (Revolutions per minute):

Transmission gear ratio: to 1

Mph (Miles per hour):

Rear end gear ratio = (tire diameter in inches)(rpm) / ((transmission gear ratio)(336)(mph)) =


Calculate Mph (Miles per hour) by Rpm (Revolutions per minute), Gear Ratios, and Tire Diameter

Rpm:

Tire Diameter in inches: (use the diameter of the tire that puts power to the ground)

Primary Gear Reduction Ratio: to 1 (If you are not sure what this is, make it 1. Most cars do not have it.)

Transmission Gear Ratio: to 1

Secondary Gear Reduction Ratio: to 1 (If you are not sure what this is, make it 1. Most cars do not have it.)

Rear End Gear Ratio (also known as Final Drive): to 1

Mph = (rpm)(tire diameter in inches) / ((336)(primary gear reduction ratio)(transmission gear ratio)(secondary gear reduction ratio)(rear end gear ratio)) =


Calculate Rpm (Revolutions per minute) by Gear Ratios, Mph and Tire Diameter

Rear End Gear Ratio: to 1

Mph (Miles per hour):

Transmission gear ratio: to 1

Tire Diameter in inches:

Rpm = (336)(rear end gear ratio)(mph)(transmission gear ratio) / (tire diameter in inches) =


Calculate Torque by Horsepower

Horsepower:

Rpm (Revolutions per minute):

Torque = (5252)(horsepower) / rpm =


Calculate Horsepower by Torque

Torque:

Rpm (Revolutions per minute):

Horsepower = (rpm)(torque) / 5252 =


Calculate Rpm After a Shift

Gear Ratio Shifting into: to 1

Gear Ratio Shifting out of: to 1

Rpm (Revolutions per minute) Before Shift:

Rpm After Shift = (rpm before shift)(gear ratio shifting into) / gear ratio shifting out of =


Calculate Cubic Inches from Bore, Stroke and Number of Cylinders

Bore: inches

Stroke: inches

Number of Cylinders:

Cubic Inches = (3.14159)(bore/2)2(stroke)(number of cylinders) =


Calculate Liters from Bore, Stroke and Number of Cylinders

Bore: millimeters

Stroke: millimeters

Number of Cylinders:

Liters = (3.14159)(bore/2)2(stroke)(number of cylinders) / 1000000 =


Calculate Cubic Inches from Liters

Liters:

Cubic Inches = (61.0237441)(liters) =


Calculate Liters from Cubic Inches

Cubic Inches:

Liters = (cubic inches) / (61.0237441) =


Calculate Kph (kilometers per hour) from Mph (miles per hour)

Mph =

Kph = (mph)(8/5) =


Calculate Mph (miles per hour) from Kph (kilometers per hour)

Kph =

Mph = (kph)(5/8) =


If you would like something calculated and did not see it here, please email your calculator request to the address below.