✖Brake Power is the power available at the crankshaft.ⓘ Brake Power [BP]			+10% -10%
✖Area of Cross Section is the enclosed surface area, product of length and breadth.ⓘ Area of Cross Section [A]			+10% -10%

✖Specific Power Output of an engine is defined as the power output per unit piston area.ⓘ Specific Power Output [P_s]

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Formula

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Specific Power Output

Formula

`"P"_{"s"} = "BP"/"A"`

Example

`"183.3333kW"="0.55kW"/"30cm²"`

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Specific Power Output Solution

STEP 0: Pre-Calculation Summary

Formula Used

Specific Power Output = Brake Power/Area of Cross Section
P_s = BP/A
This formula uses 3 Variables

Variables Used

Specific Power Output - (Measured in Watt) - Specific Power Output of an engine is defined as the power output per unit piston area.
Brake Power - (Measured in Watt) - Brake Power is the power available at the crankshaft.
Area of Cross Section - (Measured in Square Meter) - Area of Cross Section is the enclosed surface area, product of length and breadth.

STEP 1: Convert Input(s) to Base Unit

Brake Power: 0.55 Kilowatt --> 550 Watt (Check conversion here)
Area of Cross Section: 30 Square Centimeter --> 0.003 Square Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_s = BP/A --> 550/0.003

Evaluating ... ...

P_s = 183333.333333333

STEP 3: Convert Result to Output's Unit

183333.333333333 Watt -->183.333333333333 Kilowatt (Check conversion here)

FINAL ANSWER

183.333333333333 ≈ 183.3333 Kilowatt <-- Specific Power Output

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Engine Performance Parameters » Mechanical » Engine Dynamics » Specific Power Output

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Created by Akshat Nama

Indian Institute of Information Technology, Design And Manufacturing (IIITDM ), Jabalpur

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National Institute Of Technology (NIT), Hamirpur

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< 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

Specific Power Output Formula

Specific Power Output = Brake Power/Area of Cross Section
P_s = BP/A

What is Specific Power Output?

The Specific Power Output of an engine is defined as the power output per unit piston area and is a measure of the engine designer's success in using the available piston area regardless of cylinder size.

How to Calculate Specific Power Output?

Specific Power Output calculator uses Specific Power Output = Brake Power/Area of Cross Section to calculate the Specific Power Output, The Specific Power Output of an engine is defined as the ratio of the output power of the engine with its piston area. Specific Power Output is denoted by P_s symbol.

How to calculate Specific Power Output using this online calculator? To use this online calculator for Specific Power Output, enter Brake Power (BP) & Area of Cross Section (A) and hit the calculate button. Here is how the Specific Power Output calculation can be explained with given input values -> 0.183333 = 550/0.003.

FAQ

What is Specific Power Output?

The Specific Power Output of an engine is defined as the ratio of the output power of the engine with its piston area and is represented as P_s = BP/A or Specific Power Output = Brake Power/Area of Cross Section. Brake Power is the power available at the crankshaft & Area of Cross Section is the enclosed surface area, product of length and breadth.

How to calculate Specific Power Output?

The Specific Power Output of an engine is defined as the ratio of the output power of the engine with its piston area is calculated using Specific Power Output = Brake Power/Area of Cross Section. To calculate Specific Power Output, you need Brake Power (BP) & Area of Cross Section (A). With our tool, you need to enter the respective value for Brake Power & Area of Cross Section 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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