Brake Mean Effective Pressure of 4S Engines given Brake power Calculator

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✖Brake Power is the power available at the crankshaft.ⓘ Brake Power [BP]			+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]			+10% -10%
✖Engine Speed is the speed at which the crankshaft of the engine rotates.ⓘ Engine Speed [N]			+10% -10%

✖Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.ⓘ Brake Mean Effective Pressure of 4S Engines given Brake power [P_mb]

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Formula

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Brake Mean Effective Pressure of 4S Engines given Brake power

Formula

`"P"_{"mb"} = (2*"BP")/("L"*"A"*("N")) `

Example

`"0.144686kPa"=(2*"0.008kW")/("8.8cm"*"30cm²"*("4000rev/min")) `

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Brake Mean Effective Pressure of 4S Engines given Brake power Solution

STEP 0: Pre-Calculation Summary

Formula Used

Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))
P_mb = (2*BP)/(L*A*(N))
This formula uses 5 Variables

Variables Used

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.
Brake Power - (Measured in Watt) - Brake Power is the power available at the crankshaft.
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

Brake Power: 0.008 Kilowatt --> 8 Watt (Check conversion here)
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: 4000 Revolution per Minute --> 418.879020457308 Radian per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_mb = (2*BP)/(L*A*(N)) --> (2*8)/(0.088*0.003*(418.879020457308))

Evaluating ... ...

P_mb = 144.686311909091

STEP 3: Convert Result to Output's Unit

144.686311909091 Pascal -->0.144686311909091 Kilopascal (Check conversion here)

FINAL ANSWER

0.144686311909091 ≈ 0.144686 Kilopascal <-- Brake Mean Effective Pressure

(Calculation completed in 00.004 seconds)

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Home » Physics » IC Engine » Engine Performance Parameters » For 4 Stroke Engine » Brake Mean Effective Pressure of 4S Engines given Brake power

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Created by Aditya Prakash Gautam

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

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National Institute Of Technology (NIT), Hamirpur

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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 in rps)

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

Brake power measured with dynamo meter

Go Brake power measured with dynamo meter = (pi*Pulley diameter*(Engine speed in rps*60)*(Dead weight-Spring scale reading))/60

Indicated Power of Four-stroke Engine

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

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))

Work done per cycle in ic engine

Go Work done per cycle in ic engine = (Indicated engine power*Crankshaft revolutions per power stroke)/Engine Speed in rpm

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)

Combustion efficiency

Go Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)

Intake air mass of engine cylinder

Go Mass of air at intake = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/Engine Speed in rpm

Bmep given engine torque

Go Bmep = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed

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

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

Frictional power of engine

Go Frictional power of engine = Indicated Power of Engine-Brake power of engine

Actual intake air volume per cylinder

Go Actual volume of intake air = Mass of air at intake/Air density at intake

Horsepower of engine

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

Indicated mean effective pressure given mechanical efficiency

Go Imep = Bmep/Mechanical efficiency of ic engine

Frictional mean effective pressure

Go Fmep = Imep-Bmep

Brake Mean Effective Pressure of 4S Engines given Brake power Formula

Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))
P_mb = (2*BP)/(L*A*(N))

What is brake mean effective pressure?

The torque generated at the crankshaft is called the Brake Torque. The Mean effective pressure calculated from the Brake torque is called the Brake Mean Effective Pressure.

What is the difference between 4S and 2S engines?

The main difference between a 4-stroke engine and a 2-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke, while a 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke.

How to Calculate Brake Mean Effective Pressure of 4S Engines given Brake power?

Brake Mean Effective Pressure of 4S Engines given Brake power calculator uses Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed)) to calculate the Brake Mean Effective Pressure, The Brake Mean Effective Pressure of 4S Engines given Brake power formula is defined as a calculation of the engine cylinder pressure that would give the measured brake horsepower. Brake Mean Effective Pressure is denoted by P_mb symbol.

How to calculate Brake Mean Effective Pressure of 4S Engines given Brake power using this online calculator? To use this online calculator for Brake Mean Effective Pressure of 4S Engines given Brake power, enter Brake Power (BP), Stroke Length (L), Area of Cross Section (A) & Engine Speed (N) and hit the calculate button. Here is how the Brake Mean Effective Pressure of 4S Engines given Brake power calculation can be explained with given input values -> 0.000145 = (2*8)/(0.088*0.003*(418.879020457308)) .

FAQ

What is Brake Mean Effective Pressure of 4S Engines given Brake power?

The Brake Mean Effective Pressure of 4S Engines given Brake power formula is defined as a calculation of the engine cylinder pressure that would give the measured brake horsepower and is represented as P_mb = (2*BP)/(L*A*(N)) or Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed)). Brake Power is the power available at the crankshaft, 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 Brake Mean Effective Pressure of 4S Engines given Brake power?

The Brake Mean Effective Pressure of 4S Engines given Brake power formula is defined as a calculation of the engine cylinder pressure that would give the measured brake horsepower is calculated using Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed)). To calculate Brake Mean Effective Pressure of 4S Engines given Brake power, you need Brake Power (BP), Stroke Length (L), Area of Cross Section (A) & Engine Speed (N). With our tool, you need to enter the respective value for Brake Power, 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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