is a calculation of the rate at which work is done. the formula is ( torque x rpm ) / 5252 different...

Is a Calculation of the Rate at Which Work Is Done.Is a Calculation of the Rate at Which Work Is Done.

The Formula Is ( Torque X RPM ) / 5252The Formula Is ( Torque X RPM ) / 5252

Different Rating Standards Give Different Horsepower Results.Different Rating Standards Give Different Horsepower Results.

Another Term for Horsepower Is Watts.Another Term for Horsepower Is Watts.

Watts Rating on Horsepower Chart Is Not Used to Match Generator Output.Watts Rating on Horsepower Chart Is Not Used to Match Generator Output.

Torque Value and RPM Are Needed to Calculate Horsepower.Torque Value and RPM Are Needed to Calculate Horsepower.

HORSEPOWERHORSEPOWER

© 2000 Briggs & Stratton Customer Education Department 000630

Is the Measured Output of Twisting Force That the Engine Can Provide at a Given RPM.Is the Measured Output of Twisting Force That the Engine Can Provide at a Given RPM.

An Engine Is a Torque Producing Device.An Engine Is a Torque Producing Device.

Maximum Torque Can Only Be Achieved at Wide Open Throttle.Maximum Torque Can Only Be Achieved at Wide Open Throttle.

Volumetric Efficiency Is the Limiting Factor in an Engine.Volumetric Efficiency Is the Limiting Factor in an Engine.

Any Increases in RPM After Volumetric Efficiency, Will Result in Loss of Torque.Any Increases in RPM After Volumetric Efficiency, Will Result in Loss of Torque.

Excess Torque Capability Is Translated Into Speed.Excess Torque Capability Is Translated Into Speed.

TORQUETORQUE


Distance Distance

Force

Torque

WRENCHWRENCH


0

200

200

Distance (D) = 1 FootDistance (D) = 1 Foot

10 lbs

Force (F)

F X D = T

or

10 Pounds X 1 Foot = 10 Foot Pounds

Torque (T)

TORQUE WRENCHTORQUE WRENCH


200

0

200

0

200

200

Distance Traveled

1 Foot1 Foot

10 lbs

Force

Torque10 ft lbs



200

0

200

0

200

200

2 Feet2 Feet

Distance Traveled is

GreaterTorque10 ft lbs

5 lbs

Force



Combustion Pressure

PISTONPISTON


Combustion Pressure

PISTON & RODPISTON & ROD


Combustion Pressure

ROD & CRANKSHAFTROD & CRANKSHAFT


CombustionPressure

ThrowThrow

Pressure

Rotation



ThrowThrow

Pressure

Rotation

DistanceDistance

CombustionPressure



ThrowIncreased

ThrowIncreased

Rotation

Pressure

CombustionPressure



D = Perpendicular Distance

F = Force

D = Perpendicular Distance

F = Force

A Torque As Applied to a Rotating Shaft

ROTATING SHAFTROTATING SHAFT


D

F

CombustionPressure

Rotation

ThrowThrow

Combustion Pressure Is Force

Rotation Is Twist

Throw is Perpendicular DistanceThe Formula for Torque is;Force X Distance = Torque

If Torque Is to Remain the Same and We;

Increase the “Throw” of the Crankshaft, The Speed of Rotation Will Go Down.

Decreased the “Throw”, the Speed of Rotation Will Go Up.

TORQUETORQUE


Lawnmower Weights 50 Lbs.

EXCESS TORQUEEXCESS TORQUE


50 Poundsof Lift

LIFTINGLIFTING


FASTERLIFT

LIFTINGLIFTING


With the throttle plate at “wide open”, the maximum

amount of torque is achieved.



With the throttle plate at less than “wide open”, the

maximum amount of torque has not been achieved. If we open the throttle any more, torque does not

increase. The extra torque will be translated to an

increase in speed.



is a calculation of the rate at which work is done. the formula is ( torque x rpm ) / 5252 different...

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