✖Indicated Power is the total power produced due to combustion of fuel within the IC engine's cylinder in one complete cycle neglecting any losses.ⓘ Indicated Power [IP]			+10% -10%
✖Brake Power is the power available at the crankshaft.ⓘ Brake Power [BP]			+10% -10%

✖Friction Power is the power lost in an internal-combustion engine through friction between parts of the machine itself.ⓘ Friction Power [FP]

⎘ Copy

👎

Formula

✖

Friction Power

Formula

`"FP" = "IP"-"BP"`

Example

`"0.35kW"="0.9kW"-"0.55kW"`

Calculator

LaTeX

Reset

👍

Download IC Engine Formula PDF PDF Image

Friction Power Solution

STEP 0: Pre-Calculation Summary

Formula Used

Friction Power = Indicated Power-Brake Power
FP = IP-BP
This formula uses 3 Variables

Variables Used

Friction Power - (Measured in Watt) - Friction Power is the power lost in an internal-combustion engine through friction between parts of the machine itself.
Indicated Power - (Measured in Watt) - Indicated Power is the total power produced due to combustion of fuel within the IC engine's cylinder in one complete cycle neglecting any losses.
Brake Power - (Measured in Watt) - Brake Power is the power available at the crankshaft.

STEP 1: Convert Input(s) to Base Unit

Indicated Power: 0.9 Kilowatt --> 900 Watt (Check conversion here)
Brake Power: 0.55 Kilowatt --> 550 Watt (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

FP = IP-BP --> 900-550

Evaluating ... ...

FP = 350

STEP 3: Convert Result to Output's Unit

350 Watt -->0.35 Kilowatt (Check conversion here)

FINAL ANSWER

0.35 Kilowatt <-- Friction Power

(Calculation completed in 00.004 seconds)

You are here -

Home » Physics » IC Engine » Engine Performance Parameters » Mechanical » Engine Dynamics » Friction Power

Credits

Created by Aditya Prakash Gautam

Indian Institute of Technology (IIT (ISM) ), Dhanbad, Jharkhand

Aditya Prakash Gautam has created this Calculator and 25+ more calculators!

Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

Anshika Arya has verified this Calculator and 2500+ more calculators!

< 25 Engine Dynamics Calculators

Overall heat transfer coefficient of IC engine

Go Overall Heat Transfer Coefficient = 1/((1/Heat Transfer Coefficient on Gas Side)+(Thickness of Engine Wall/Thermal conductivity of material)+(1/Heat Transfer Coefficient on Coolant Side))

Rate of convection heat transfer between engine wall and coolant

Go Rate of Convection Heat Transfer = Convection Heat Transfer Coefficient*Surface Area of Engine Wall*(Engine Wall Surface Temperature-Temperature of Coolant)

Heat transfer across engine wall given overall heat transfer coefficient

Go Heat Transfer across Engine Wall = Overall Heat Transfer Coefficient*Surface Area of Engine Wall*(Gas side temperature-Coolant Side Temperature)

Inlet-Valve Mach Index

Go Mach Index = ((Cylinder Diameter/Inlet Valve Diameter)^2)*((Mean Piston Speed)/(Flow Coefficient*Sonic Velocity))

Brake Power given Mean Effective Pressure

Go Brake Power = (Brake Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))

Beale Number

Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Engine displacement given number of cylinders

Go Engine Displacement = Engine Bore*Engine Bore*Stroke Length*0.7854*Number of Cylinders

Indicated Thermal Efficiency given Indicated Power

Go Indicated Thermal Efficiency = ((Indicated Power)/(Mass of Fuel Supplied per Second*Calorific Value of Fuel))*100

Brake Thermal Efficiency given Brake Power

Go Brake Thermal Efficiency = (Brake Power/(Mass of Fuel Supplied per Second*Calorific Value of Fuel))*100

Rate of cooling of engine

Go Rate of Cooling = Constant for Cooling Rate*(Engine Temperature-Engine Surrounding Temperature)

Time taken for engine to cool

Go Time Required to Cool Engine = (Engine Temperature-Final Engine Temperature)/Rate of Cooling

Engine rpm

Go Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter

Kinetic Energy Stored in Flywheel of IC Engine

Go Kinetic Energy Stored in the Flywheel = (Flywheel Moment of Inertia*(Flywheel Angular Velocity^2))/2

Swept Volume

Go Swept Volume = (((pi/4)*Inner Diameter of Cylinder^2)*Stroke Length)

Indicated specific fuel consumption

Go Indicated Specific Fuel Consumption = Fuel Consumption in IC engine/Indicated Power

Indicated Thermal Efficiency given Relative Efficiency

Go Indicated Thermal Efficiency = (Relative Efficiency*Air Standard Efficiency)/100

Relative Efficiency

Go Relative Efficiency = (Indicated Thermal Efficiency/Air Standard Efficiency)*100

Brake specific fuel consumption

Go Brake Specific Fuel Consumption = Fuel Consumption in IC engine/Brake Power

Indicated Power given Mechanical Efficiency

Go Indicated Power = Brake Power/(Mechanical Efficiency/100)

Brake Power given Mechanical Efficiency

Go Brake Power = (Mechanical Efficiency/100)*Indicated Power

Mechanical Efficiency of IC engine

Go Mechanical Efficiency = (Brake Power/Indicated Power)*100

Specific Power Output

Go Specific Power Output = Brake Power/Area of Cross Section

Mean piston speed

Go Mean Piston Speed = 2*Stroke Length*Engine Speed

Friction Power

Go Friction Power = Indicated Power-Brake Power

Peak torque of engine

Go Peak Torque of Engine = Engine Displacement*1.25

< 21 Important Formulas of Engine Dynamics Calculators

Inlet-Valve Mach Index

Go Mach Index = ((Cylinder Diameter/Inlet Valve Diameter)^2)*((Mean Piston Speed)/(Flow Coefficient*Sonic Velocity))

Brake Power given Mean Effective Pressure

Go Brake Power = (Brake Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))

Beale Number

Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Engine displacement given number of cylinders

Go Engine Displacement = Engine Bore*Engine Bore*Stroke Length*0.7854*Number of Cylinders

Indicated Thermal Efficiency given Indicated Power

Go Indicated Thermal Efficiency = ((Indicated Power)/(Mass of Fuel Supplied per Second*Calorific Value of Fuel))*100

Brake Thermal Efficiency given Brake Power

Go Brake Thermal Efficiency = (Brake Power/(Mass of Fuel Supplied per Second*Calorific Value of Fuel))*100

Rate of cooling of engine

Go Rate of Cooling = Constant for Cooling Rate*(Engine Temperature-Engine Surrounding Temperature)

Time taken for engine to cool

Go Time Required to Cool Engine = (Engine Temperature-Final Engine Temperature)/Rate of Cooling

Engine rpm

Go Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter

Kinetic Energy Stored in Flywheel of IC Engine

Go Kinetic Energy Stored in the Flywheel = (Flywheel Moment of Inertia*(Flywheel Angular Velocity^2))/2

Swept Volume

Go Swept Volume = (((pi/4)*Inner Diameter of Cylinder^2)*Stroke Length)

Indicated specific fuel consumption

Go Indicated Specific Fuel Consumption = Fuel Consumption in IC engine/Indicated Power

Relative Efficiency

Go Relative Efficiency = (Indicated Thermal Efficiency/Air Standard Efficiency)*100

Brake specific fuel consumption

Go Brake Specific Fuel Consumption = Fuel Consumption in IC engine/Brake Power

Equivalence ratio

Go Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio

Indicated Power given Mechanical Efficiency

Go Indicated Power = Brake Power/(Mechanical Efficiency/100)

Brake Power given Mechanical Efficiency

Go Brake Power = (Mechanical Efficiency/100)*Indicated Power

Mechanical Efficiency of IC engine

Go Mechanical Efficiency = (Brake Power/Indicated Power)*100

Specific Power Output

Go Specific Power Output = Brake Power/Area of Cross Section

Mean piston speed

Go Mean Piston Speed = 2*Stroke Length*Engine Speed

Friction Power

Go Friction Power = Indicated Power-Brake Power

Friction Power Formula

Friction Power = Indicated Power-Brake Power
FP = IP-BP

What methods measure friction power of an IC engine ?

Methods of measurement of friction power(F.P) of an IC engine are as follows:
- By measuring I.P and B.P (Simply FP = IP - BP)
- Morse test
- Willans line method
- Motoring test

How to Calculate Friction Power?

Friction Power calculator uses Friction Power = Indicated Power-Brake Power to calculate the Friction Power, The Friction Power formula is defined as the difference between the indicated power and brake power of an IC engine. Friction Power is denoted by FP symbol.

How to calculate Friction Power using this online calculator? To use this online calculator for Friction Power, enter Indicated Power (IP) & Brake Power (BP) and hit the calculate button. Here is how the Friction Power calculation can be explained with given input values -> 0.00035 = 900-550.

FAQ

What is Friction Power?

The Friction Power formula is defined as the difference between the indicated power and brake power of an IC engine and is represented as FP = IP-BP or Friction Power = Indicated Power-Brake Power. Indicated Power is the total power produced due to combustion of fuel within the IC engine's cylinder in one complete cycle neglecting any losses & Brake Power is the power available at the crankshaft.

How to calculate Friction Power?

The Friction Power formula is defined as the difference between the indicated power and brake power of an IC engine is calculated using Friction Power = Indicated Power-Brake Power. To calculate Friction Power, you need Indicated Power (IP) & Brake Power (BP). With our tool, you need to enter the respective value for Indicated Power & Brake Power and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search