✖Number of Cylinders is the count of the cylinders that are present on the engine.ⓘ Number of Cylinders [k]			+10% -10%
✖Mean Effective Pressure is used to measure the performance of a combustion engine.ⓘ Mean Effective Pressure [MEP]			+10% -10%
✖Stroke Length is the distance travelled by the piston during each cycle.ⓘ Stroke Length [L]			+10% -10%
✖Area of Cross Section is the enclosed surface area, product of length and breadth.ⓘ Area of Cross Section [A_c]			+10% -10%
✖Engine Speed is the speed at which the crankshaft of the engine rotates.ⓘ Engine Speed [N]			+10% -10%

✖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 of Four-stroke Engine [IP]

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Formula

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Indicated Power of Four-stroke Engine

Formula

`"IP" = ("k"*"MEP"*"L"*"A"_{"c"}*("N"))/(2)`

Example

`"138.2301W"=("5000"*"5Pa"*"8.8cm"*"30cm²"*("400rev/min"))/(2)`

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Indicated Power of Four-stroke Engine Solution

STEP 0: Pre-Calculation Summary

Formula Used

Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)
IP = (k*MEP*L*A_c*(N))/(2)
This formula uses 6 Variables

Variables Used

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.
Number of Cylinders - Number of Cylinders is the count of the cylinders that are present on the engine.
Mean Effective Pressure - (Measured in Pascal) - Mean Effective Pressure is used to measure the performance of a combustion engine.
Stroke Length - (Measured in Meter) - Stroke Length is the distance travelled by the piston during each cycle.
Area of Cross Section - (Measured in Square Meter) - Area of Cross Section is the enclosed surface area, product of length and breadth.
Engine Speed - (Measured in Radian per Second) - Engine Speed is the speed at which the crankshaft of the engine rotates.

STEP 1: Convert Input(s) to Base Unit

Number of Cylinders: 5000 --> No Conversion Required
Mean Effective Pressure: 5 Pascal --> 5 Pascal No Conversion Required
Stroke Length: 8.8 Centimeter --> 0.088 Meter (Check conversion here)
Area of Cross Section: 30 Square Centimeter --> 0.003 Square Meter (Check conversion here)
Engine Speed: 400 Revolution per Minute --> 41.8879020457308 Radian per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

IP = (k*MEP*L*A_c*(N))/(2) --> (5000*5*0.088*0.003*(41.8879020457308))/(2)

Evaluating ... ...

IP = 138.230076750912

STEP 3: Convert Result to Output's Unit

138.230076750912 Watt --> No Conversion Required

FINAL ANSWER

138.230076750912 ≈ 138.2301 Watt <-- Indicated Power

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Engine Performance Parameters » Mechanical » For 4 Stroke Engine » Indicated Power of Four-stroke Engine

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< 24 For 4 Stroke Engine Calculators

Volumetric efficiency of IC engine

Go Volumetric Efficiency of IC Engine = (Air Mass Flow Rate*Crankshaft Revolutions per Power Stroke)/(Air Density at Intake*Theoretical Volume of Engine*Engine Speed)

Rate of heat conduction of engine wall

Go Rate of Heat Conduction of Engine Wall = ((Thermal Conductivity of Material)*Surface Area of Engine Wall*Temperature Difference across Engine Wall)/Thickness of Engine Wall

Indicated Power of Four-stroke Engine

Go Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)

Brake power measured with dynamo meter

Go Brake Power = (pi*Pulley Diameter*(Engine Speed*60)*(Dead Weight-Spring Scale Reading))/60

Volumetric Efficiency for 4S engines

Go Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Air Density at Intake*Piston Swept Volume*(Engine Speed)))*100

Brake Mean Effective Pressure of 4S Engines given Brake power

Go Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))

Fuel conversion efficiency

Go Fuel Conversion Efficiency = Work Done per Cycle in IC Engine/(Mass of Fuel Added per Cycle*Heating Value of the Fuel)

Bmep given engine torque

Go Brake Mean Effective Pressure = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed

Combustion efficiency

Go Combustion Efficiency = Heat Added by Combustion per Cycle/(Mass of Fuel Added per Cycle*Heating Value of the Fuel)

Work done per cycle in ic engine

Go Work Done per Cycle in IC Engine = (Indicated Engine Power*Crankshaft Revolutions per Power Stroke)/Engine RPM

Intake air mass of engine cylinder

Go Mass of Air at Intake = (Air Mass Flow Rate*Crankshaft Revolutions per Power Stroke)/Engine RPM

Displaced volume in engine cylinder

Go Displaced Volume = (Piston Stroke*pi*(Engine Cylinder Bore in Meter^2))/4

Intake air density

Go Air Density at Intake = Intake Air Pressure/([R]*Intake Air Temperature)

Thermal efficiency of IC engine

Go Thermal Efficiency of IC Engine = Work Done per Cycle in IC Engine/Heat Added by Combustion per Cycle

Indicated mean effective pressure given mechanical efficiency

Go Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine

Frictional mean effective pressure

Go Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure

Volumetric efficiency of IC engine given actual volume of engine cylinder

Go Volumetric Efficiency of IC Engine = Actual Volume of Intake Air/Theoretical Volume of Engine

Connecting Rod Length to Crank Radius Ratio

Go Connecting Rod Length to Crank Radius Ratio = Connecting Rod Length/Crank Radius of Engine

Ratio of cylinder bore to piston stroke

Go Connecting Rod Length to Crank Radius Ratio = Connecting Rod Length/Crank Radius of Engine

Total cylinder volume of IC engine

Go Total Volume of an Engine = Total Number of Cylinders*Total Volume of Engine Cylinder

Fuel conversion efficiency given thermal conversion efficiency

Go Fuel Conversion Efficiency = Combustion Efficiency*Thermal Conversion Efficiency

Actual intake air volume per cylinder

Go Actual Volume of Intake Air = Mass of Air at Intake/Air Density at Intake

Frictional power of engine

Go Frictional Power of Engine = Indicated Power-Brake Power

Horsepower of engine

Go Horsepower of Engine = (Engine Torque*Engine RPM)/5252

Indicated Power of Four-stroke Engine Formula

Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)
IP = (k*MEP*L*A_c*(N))/(2)

What is Indicated power ?

The indicated power of an I.C engine is the total power developed within the cylinder in one complete cycle neglecting any losses. It is the sum total of the brake power and the friction power of an engine.
In short it is the maximum power available from the expanding gases developed by combustion of fuel within the cylinder; neglecting frictional losses, mechanical losses and loss due to heat and enthalpy.

What is the significance of 2 in denominator of above formula ?

It is actually the number of cycles per minute. In four stroke IC engines, one cycle will be completed in two revolutions of the crank shaft. Therefore the work will be produced in every alternative revolutions of the crank shaft. Thus the number of cycles per minute will be equal to half the number of revolutions per minute.

How to Calculate Indicated Power of Four-stroke Engine?

Indicated Power of Four-stroke Engine calculator uses Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2) to calculate the Indicated Power, The Indicated Power of Four-stroke Engine formula is defined as multiplication of actual mean effective pressure (in N/m^2), stroke length (in m), area of cross section of cylinder (m^2), engine speed (RPM), and no. of cylinders divided by the 60000 * 2. Indicated Power is denoted by IP symbol.

How to calculate Indicated Power of Four-stroke Engine using this online calculator? To use this online calculator for Indicated Power of Four-stroke Engine, enter Number of Cylinders (k), Mean Effective Pressure (MEP), Stroke Length (L), Area of Cross Section (A_c) & Engine Speed (N) and hit the calculate button. Here is how the Indicated Power of Four-stroke Engine calculation can be explained with given input values -> 1382.301 = (5000*5*0.088*0.003*(41.8879020457308))/(2).

FAQ

What is Indicated Power of Four-stroke Engine?

The Indicated Power of Four-stroke Engine formula is defined as multiplication of actual mean effective pressure (in N/m^2), stroke length (in m), area of cross section of cylinder (m^2), engine speed (RPM), and no. of cylinders divided by the 60000 * 2 and is represented as IP = (k*MEP*L*A_c*(N))/(2) or Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2). Number of Cylinders is the count of the cylinders that are present on the engine, Mean Effective Pressure is used to measure the performance of a combustion engine, Stroke Length is the distance travelled by the piston during each cycle, Area of Cross Section is the enclosed surface area, product of length and breadth & Engine Speed is the speed at which the crankshaft of the engine rotates.

How to calculate Indicated Power of Four-stroke Engine?

The Indicated Power of Four-stroke Engine formula is defined as multiplication of actual mean effective pressure (in N/m^2), stroke length (in m), area of cross section of cylinder (m^2), engine speed (RPM), and no. of cylinders divided by the 60000 * 2 is calculated using Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2). To calculate Indicated Power of Four-stroke Engine, you need Number of Cylinders (k), Mean Effective Pressure (MEP), Stroke Length (L), Area of Cross Section (A_c) & Engine Speed (N). With our tool, you need to enter the respective value for Number of Cylinders, Mean Effective Pressure, Stroke Length, Area of Cross Section & Engine Speed and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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