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Advantages of Diesel Engines

Updated on March 31, 2011

Advantages of Diesel Engines

Advantages of Diesel Engines In today’s age of consumption, technology is being developed with a great acceleration. As a result of increasing of population all over the world, technology must use the sources of our planet wisely. Furthermore, technology must meet the increasing demands of the consumers. More specifically, in motor technology, customers want low expenditures, less problems after purchasing and more powerful vehicles in return of their money. At this point, there is such a solution of all these matter explained above. It is the diesel engines. Diesel engine is an internal-combustion engine in which the fuel is sprayed into the cylinders after the air charge has been so highly compressed that it has attained a temperature sufficient to ignite fuel. The diesel engines require expensive injection systems. Basic carburetors are cheaper than diesel injection systems. Moreover, the diesel engines are heavier than gasoline engines because of their high ignition pressure and designing aim. The ignition pressure of diesel engines is nearly two times more than gasoline engines, so they are designed heavier to remove this effect Although it is thought that diesel engine is not a good choice for motor vehicles because of its disadvantages like expensive injection systems and being heavy, it is very efficient due to its advantages such as economic benefits, better technical properties and environmental benefits.

First of all, there are so many economic benefits of the diesel engines such as high

fuel efficiency and low costs of the diesel technology. Diesel combustion differs fundamentally from spark-ignition combustion in that the entire air charge is at a temperature sufficient to ignite fuel, and each particle of fuel receives the energy that ignites it directly from the hot air. At this point Riesenberg & Faupel asserts on page 8 that direct-injection systems reduce the usage of fuel up to %20 compared to chamber engines. The fuel usage of light-duty diesels compared with gasoline engines of almost the same power is 30-60% lower . The compression ignition and

The high energy of diesel fuel are the reasons for these efficiency values . As mentioned in Diesel Engine for General Aviation that compression ratio in diesel engines is approximately twice as high as in gasoline engines. The more compression ignition pressure the diesel engines have, the more thermal efficiency the diesel engines get, so this increases the fuel efficiency . Diesel Technology Forum emphasize on page 3 that diesel fuel contains 11% more energy than gasoline of the same amount. Because of the fact that diesel fuel contains more energy, it is clear that the diesel engines have better efficiency . Thus, the diesel engines have better fuel efficiency than gasoline engines, because gasoline engines ignite fuel at low pressures and low temperatures. For example, the new Audi A2 which has an 1,2 liter 3 cylinder turbo diesel satisfies 79 MPG on city/highway combined. Furthermore, the A2 passes the latest gasoline/electric hybrid when the criterion is fuel efficiency . The European-market Audi A2, which is a developed model of the diesel engines, gets 87 MPG on the highway, which is a very impressive point of fuel efficiency . Additionally, the 2001 VW Jetta having a modern turbocharged direct injection diesel engine is 66% more efficient than a gasoline powered Jetta . Another important benefit for diesel engine is that the government tax structures in Europe helped the diesel technology to increase its financial benefits . Diesel Technology Forum indicates on page 8 that European governments encourage the use of diesel technology through market-based programs that reward the purchase of fuel efficient vehicles. For example, according to year 2000 fuel prices, a 2001 turbo-diesel Jetta costs $2300 less than the gasoline powered one over 100.000 miles.

What is more, the technical properties of diesel engines, which are power, durability and reliability, are at incredible level. Because of the fact that the diesel engines have higher compression ratio even at low speeds, diesel engines produce high power. For example, 19.5 to 1 is a compression ratio of a diesel powered Jetta for a Volkswagen 1.9 liter TDI, whereas, 10 to 1 is a compression ratio of a gasoline powered Volkswagen 2.0 liter. Diesel

Technology Forum states that Compression ignition produce superior combustion force in the cylinder, which in turn provides more power or torque. For example, a diesel used Jetta improves 155 lbs.-ft. torque at 1900 RPMs. On the contrary, a gasoline powered Jetta improves 122 lbs.-ft. torque at 2600 RPMs . Besides these properties, excellent reliability and durability of the diesel engines are one of the main reasons why the diesels are widely used in commercial applications . DieselNet indicates that the useful life of the diesel engines is approximately four times longer than gasoline engines. Diesel Technology Forum explained on page 4 that durability of the diesel engines is longer than the spark ignition engines. For example, a diesel Audi is advised to be checked when it has done 50.000 km which is 20.000 km longer than a gasoline engine . DieselNet declared on page 16 that generally, the gasoline engines have more problems about engine breakdowns than the diesel engines have. Furthermore, the diesel engines have low friction loses, which develops the useful life of the engine, because of the low engine speeds .

Additionally, compared to the gasoline engines, the diesel engines are less harmful to the environment with their low emission gases, quiet engines and content of the diesel fuel. The most important greenhouse gas is the carbon dioxide for the automotive sector . At this point, Diesel Technology Forum states on page 8 that Diesel engines emit far less CO2 than gasoline-powered engines, and Europeans have embraced diesel technology as one of cutting carbon emissions from mobile sources. Compared with the gasoline engines, the diesel engines produce almost no emission because of the diesel fuel . With the increase of greenhouse gases over the world, environmental advantages of diesel engines became more popular. Diesel Technology In addition to advanced aftertreatment technologies and low-sulfur diesel fuel, other engine enhancements like air-to-air charge cooling and exhaust gas recirculation have also contributed to significant improvements in NOx emissions. and adds Today's advanced diesel technology has cut emission significantly. Furthermore, The diesel principle avoids the fluctuations of the ignition pressure which plague the spark ignited engine; this eliminates one source of vibration. . Plus, while handle or transfer processes, the diesel fuel dos not release its hydrocarbons into the air, because diesel fuel has lower volatility than gasoline .diesel fuel includes a large amount of hydrocarbons, but not evaporate until it heated up to between 180oC and 360oC Moreover, some toxic materials such as benzol, lead and scavengers are not included in diesel fuel and kerosene .

In conclusion, in spite of the disadvantages of diesel engines like expensive injection systems and being heavy, the advantages of the diesel engines are fascinating. Diesel engines

protect the sources of our planet, at the same time, they meet the expectations of the consumers. Diesel engines are become much less harmful for the environment, much more powerful and much more economic by the latest improvements in diesel technology. New vibration and noise control systems made diesel engines more popular. The latest achievements in emission cuts is very important for the governments which suffer from the excess exhaust gases in their cities. Long life and incredible reliability of the diesel engines are very attractive for consumers, besides its high power. These are why usage of diesel engines is increasing with such acceleration. The time has come for the diesel engines, the diesel technology is ready to dominate the motor technology.


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    • stars439 profile image

      stars439 6 years ago from Louisiana, The Magnolia and Pelican State.

      Wonderful hub. Great work. GBY

    • daffodil2010 profile image

      daffodil2010 6 years ago

      thank you. i also like your hubs.

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