✖Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.ⓘ Brake Mean Effective Pressure [P_mb]			+10% -10%
✖Mechanical Efficiency of IC Engine is defined as the ratio of brake power (delivered power) to the indicated power (power provided to the piston).ⓘ Mechanical Efficiency of IC Engine [η_m]			+10% -10%

✖Indicated Mean Effective Pressure is the average pressure acting on a piston during the different portions of its cycle.ⓘ Indicated mean effective pressure given mechanical efficiency [P_ime]

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Formula

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Indicated mean effective pressure given mechanical efficiency

Formula

`"P"_{"ime"} = "P"_{"mb"}/"η"_{"m"}`

Example

`"437.5Pa"="350Pa"/"0.8"`

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Indicated mean effective pressure given mechanical efficiency Solution

STEP 0: Pre-Calculation Summary

Formula Used

Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine
P_ime = P_mb/η_m
This formula uses 3 Variables

Variables Used

Indicated Mean Effective Pressure - (Measured in Pascal) - Indicated Mean Effective Pressure is the average pressure acting on a piston during the different portions of its cycle.
Brake Mean Effective Pressure - (Measured in Pascal) - Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.
Mechanical Efficiency of IC Engine - Mechanical Efficiency of IC Engine is defined as the ratio of brake power (delivered power) to the indicated power (power provided to the piston).

STEP 1: Convert Input(s) to Base Unit

Brake Mean Effective Pressure: 350 Pascal --> 350 Pascal No Conversion Required
Mechanical Efficiency of IC Engine: 0.8 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_ime = P_mb/η_m --> 350/0.8

Evaluating ... ...

P_ime = 437.5

STEP 3: Convert Result to Output's Unit

437.5 Pascal --> No Conversion Required

FINAL ANSWER

437.5 Pascal <-- Indicated Mean Effective Pressure

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Engine Performance Parameters » Mechanical » For 4 Stroke Engine » Indicated mean effective pressure given mechanical efficiency

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Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

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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 mean effective pressure given mechanical efficiency Formula

Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine
P_ime = P_mb/η_m

What is indicated mean effective pressure?

The mean effective pressure (MEP) is a quantity relating to the operation of a reciprocating engine and is a measure of an engine's capacity to do work that is independent of engine displacement.When quoted as an indicated mean effective pressure (IMEP), it may be thought of as the average pressure acting on a piston during the different portions of its cycle.

How to Calculate Indicated mean effective pressure given mechanical efficiency?

Indicated mean effective pressure given mechanical efficiency calculator uses Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine to calculate the Indicated Mean Effective Pressure, The Indicated mean effective pressure given mechanical efficiency formula is defined as the average pressure acting on a piston during the different portions of its cycle. Indicated Mean Effective Pressure is denoted by P_ime symbol.

How to calculate Indicated mean effective pressure given mechanical efficiency using this online calculator? To use this online calculator for Indicated mean effective pressure given mechanical efficiency, enter Brake Mean Effective Pressure (P_mb) & Mechanical Efficiency of IC Engine (η_m) and hit the calculate button. Here is how the Indicated mean effective pressure given mechanical efficiency calculation can be explained with given input values -> 437.5 = 350/0.8.

FAQ

What is Indicated mean effective pressure given mechanical efficiency?

The Indicated mean effective pressure given mechanical efficiency formula is defined as the average pressure acting on a piston during the different portions of its cycle and is represented as P_ime = P_mb/η_m or Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine. Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower & Mechanical Efficiency of IC Engine is defined as the ratio of brake power (delivered power) to the indicated power (power provided to the piston).

How to calculate Indicated mean effective pressure given mechanical efficiency?

The Indicated mean effective pressure given mechanical efficiency formula is defined as the average pressure acting on a piston during the different portions of its cycle is calculated using Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine. To calculate Indicated mean effective pressure given mechanical efficiency, you need Brake Mean Effective Pressure (P_mb) & Mechanical Efficiency of IC Engine (η_m). With our tool, you need to enter the respective value for Brake Mean Effective Pressure & Mechanical Efficiency of IC Engine 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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