The mean effective pressure(mep) is a usefull relative engine performance measure and is obtained by dividing the work done per cycle by the cylinder(s) total displaced volume per cycle.

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Mean effective pressure is hypothetical pressure, which is thought to be acting on the piston throughout the power stroke.

MEP in bar=(power in KW x 60) / (L xA x(N/n) x No. of cylinder x100)

Where, L=stroke length

A= c/s area

N = Rotational speed of engine RPM

n= number of revolutions required to complete one engine cycle

As is described above, I think you have got the answer. MEP is a basic concept. From its name it is pressure, but it is not. it's the cycle work done by per unit volume.

Pt=W/Vs

W:cycke work done by the cylinder

Vs:swept volume

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How can I calculate the work done by the cylinder?

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Chen Bin How to measure the amount of work done theoretically? is there any other method to arrive at the mean effective pressure from the fuel quantity and calorific value?

It can be easily calculated please refer to :

The work done per cycle by the cylinder and total displaced volume per cycle

Diesel Engine Mean effective pressure and torque

The formula below is used for calculation mean effective pressure with this i have some questions:

1 : is the mean Effective pressure constant? if no, what is the value that is usually provided by the manufacture on the datasheet?

2: is the indicated torque of a diesel engine constant?, from the equation below it will be dependent on the MEP

𝑝𝑚𝑒=2𝜋𝑛𝑟𝑇/𝑛𝑐𝑉𝑑

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In My case an doubt i have placed the pressure sensor in the engine and using it i am measuring the mean pressure so can use above all equation to find out the work done per cycle if i have data of change in volume.

You would probably measure the Pmax not the mean pressure.

You need to know either effective power for each cylinder or torque produced. Either way you'll need to know displacement volume for the cylinder.