How To Calculate Diesel Engine Power

As a car owner, you may want to get the maximum performance from your engine for as long as possible.

After all, knowing your car’s performance is still important whether you have a brand-new model or are attempting to drive your old trusty automobile to its next mega-milestone.

And one way you can track it is to calculate the diesel engine power of your car.

In fact, you don’t have to be a qualified mechanic to calculate your diesel engine power.

First off, as diesel engines are either two-stroke or four-stroke engines, you must know which one is yours. Now, here’s how you do it. 

Calculating Two-Stroke Diesel Engine

A power card or PV diagram may measure indicated power in diesel engines. The diagram’s area indicates the work performed inside the cylinder in one spin.

The area can be calculated using a ‘Planimeter‘ or applying the mid ordinates rule. In reality, in current engines, this figure may be taken constantly by using two transducers, one in the combustion region and the other on the shaft.

So, by utilizing your computer, you may obtain an online suggested diagram and the power of all cylinders.

The area is then divided by the diagram’s length to produce the mean height. When the mean height is multiplied by the spring scale of the indicator mechanism, the indicated mean effective pressures for the cylinder are obtained.

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The work done in the cylinder may now be calculated using the mean effective or average pressure [Pm]. 

To calculate the indicated power, apply the following formulas to the area of the indicator graphic.

  • Area of the indicator diagram = a [mm2]
  • Average height of the diagram = a [mm2] / l [mm]
  • Average mean indicator pressure = a [mm2] / l [mm] x k [bar / mm]
  • or Pm = ( a / l ) x k [bar]
  • where k = spring scale in bar per mm

Work done in one cycle = Mean Indicated Pressure x Piston Area x Stroke Length

= [Pm] x [A] x [L] 

To estimate the power of this unit, first, establish the rate at which work is done.

Calculating Four-Stroke Diesel Engine

A four-stroke engine’s cycle of work is accomplished in four piston strokes or two crankshaft rotations. A cycle consists of 7200 crankshaft rotations since every stroke comprises 1800 crankshaft rotations.

A hypothetical pressure can be defined as mean effective pressure. It is considered to operate on the piston during the power stroke.

(Pm LAN/n 100)/60 in bar = power in kW

where Pm denotes the mean effective pressure

  • L = stroke length in m
  • A = the piston’s area in m2
  • N = Engine RPM Rotational Speed
  • n = number of revolutions needed to finish one engine cycle; where n= 2.
  • Hence, you can see that the power output of a particular engine may be.

How does Diesel Engine Works?

YouTube video

Understanding the concepts mentioned above can be hard. So, here’s a video that will help you understand how these types of engines work.

Also, you’ll see how you can apply the given calculations to get a better grasp of these in an actual problem.

Frequently Asked Questions (FAQs)

What Is Engine Power?

Engine power refers to the engine’s capacity to power it. In general, the crankshaft takes up the crankshaft power is the engine power: Consequently, shaft power is created by engine torque and the angular motion of the crankshaft.

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How to Calculate Engine Power?

The speed and torque of an electric engine are used to compute its power or horsepower (Force x Distance). 

What Exactly Is Engine Kw?

This unit is used to measure the amount of power generated by an automobile’s engine – in this example, the rate at which fossil fuel energy is produced through movement within the car.

The amount of power you produce typically impacts how rapidly you can accelerate an automobile.

How to Calculate Kw For An Engine?

When you multiply 0 by the amount of power produced by each electric horsepower, you obtain 0 cents per kilowatt-hour. This formula multiplies the electric horsepower by 746 kilowatts. 

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