Gasoline Engine and Diesel Engine

Introduction

The majority of automobiles we see or we own, are either gasoline-powered or diesel-powered. But what actually differs the two, their size, power, cost, and their use, we shall discuss here. Though the fuel types differ, the working of the engine remains almost the same. The majority of light motor vehicles we see are gasoline-powered and all the heavy motor vehicles we see are usually diesel-powered, and well there are valid points for them to be. We will discuss some basic points to get clear about what and why?

As discussed earlier, the engine works on 4 strokes ie

• Suction Stroke
• Compression Stroke
• Power Stroke
• Exhaust Stroke

Gasoline Engine

Gasoline engines are generally used in a light motor vehicle in which power demand is not too high this is because the power output for gasoline engines is lower as compared to a diesel engine for the same capacity.

Secondly, during the suction stroke when the piston tends to move down from Top Dead Center ( TDC ) to Bottom Dead Center ( BDC ) it creates a Vaccum, a pressure difference is created due to which the charge is sucked into the cylinder. This charge in a gasoline-powered engine is a mixture of air and fuel in an appropriate ration also called stoichiometric ration that usually lies close to 14:1, meaning for every 14 molecules of the air we have 1 molecule of fuel combined.

A spark plug is used to initiate the combustion located at the top middle position of the cylinder.

The compression ratio of a gasoline engine is lower than that of a diesel engine.

Note: The compression ratio is defined as the ratio of maximum volume to the total volume of a cylinder.

Diesel Engine

A diesel engine is generally used in heavy motor vehicles in which power demand is high because these engines are capable of producing high power.

Secondly, during the suction stroke when the piston tends to move down from Top Dead Center ( TDC ) to Bottom Dead Center ( BDC ) it creates a Vaccum, a pressure difference is created due to which the charge is sucked into the cylinder. This charge in a diesel-powered engine consists only of the air, which is then compressed up to a high-pressure range during the compression stroke raising its temperature. Instead of a spark plug, a diesel engine uses a fuel injector located at the top middle position of the cylinder which releases the fuel in the atomized form at the time when the air is compressed by the piston to the self-initiating temperature which in turn initiates the combustion.

The compression ratio of a diesel engine is greater than a gasoline engine.

Diesel engines are comparatively heavier than gasoline engines because they require extra mechanical components.

Conclusion

If your requirement is to carry a large amount of load, or more power demand then diesel engines are great, on the other hand, if the requirement is very limited and does not require the carrying of major loads, usage is limited for personal use then petrol car is a good choice.

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