7/30/2019 Solving for Rotating Horsepower

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Solving for rotating horsepower.

Inputs:torque pound-foot

speed (rpm) revolution/minute

1 Calculate

Conversions:

torque = 0 = 0 pound-footspeed = 0 = 0 revolution/minute

Solution:horsepower (hp) = HAS NOT BEEN CALCULATED

Other Units:

Change EquationSelect an equation to solve for a different unknown

related

Engine horsepower estimate using quarter mile elapsed time

Includes plot and graph

rotating horsepower

Rotating horsepower

Torque

Speed - revolutions per minute (rpm)

estimate engine or motor horse power for cars, trucks and motorcycles

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7/30/2019 Solving for Rotating Horsepower

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Estimate of engine

horsepower after a

quarter mile run usingthe trap speed method.

Determine the increasein engine horsepower

when an after market

modification, race orperformance part has

been installed with trap

speed.

Calculate engine

horsepower after aquarter mile run using

the ET method.

Compute estimated

increase in enginehorsepower when an

after market, racing

upgrade or performancepart has been installed

with ET.

Dyno correction factor.

Factor corrects

horsepower for normallyaspirated internal

combustion engine to a

standard humidity,

pressure and temperatureafter dynamometer

measurement.

Calculate a vehicles

power to weight ratio.

Acceleration is related tothe ratio.

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7/30/2019 Solving for Rotating Horsepower

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Gear Design Equations and Formulas CalculatorAutomobile Car Truck

Solving For Speed

tire radius meter

rotation speed revolution/minute

gear ratio

1 Calculate

TireRadius = 0 = 0 inch

RotationVelocity = 0 = 0 revolution/minuteGearRatio = 0 = 0

speed = HAS NOT BEEN CALCULATED

Change EquationSelect an equation to solve for a different unknown

speed

rotation velocity

gear ratio

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7/30/2019 Solving for Rotating Horsepower

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tire size - radius

effective gear ratio

tire size - diameter

crawl ratio

Where

speed = MPH - miles per hour

tire radius, tire diameter, rim diameter = inchesgear ratio = if ring and pinion ratio is 4.10:1 use 4.10

rotation velocity = RPM - revolutions per minute

effective gear ratio = determine new gear ratio after a tire size changecrawl ratio = four wheel drive rear axle differential, transfer

case low range and transmission ratios

section width = millimeters

aspect ratio = unitless

oks:

reference page

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7/30/2019 Solving for Rotating Horsepower

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