Although diesel engines are more efficient, there are eight historical problems that may have held them back. •Due to the higher compression ratios, diesel engines tend be heavier than the equivalent gasoline engine. •Diesel vehicles and diesel engines tend to be more expensive than gas. •Because of their weight and compression ratio, diesel engines tend to have lower RPM ranges than gas engines. This gives diesel engines more torque rather than higher horsepower, and this tends to make diesel vehicles slower in terms of acceleration. •Diesel engines have to be fuel injected,and in the past fuel injection was very expensive and less reliable. •Diesel engines tend to produce more smoke and smell very funny when compared to gasoline engines. •They are harder to start in cold weather and if they contain glow plugs, the diesel engines may require you to wait before you start the engine so that the glow plugs can heat up. •Diesel engines are much noisier than gas engines and tend to vibrate quite a bit. •Diesel fuel is less available than gas. Although one or two of these disadvantages would be acceptable, a group of them is a big tur away for many people.
Even though the list above are reasons in the past as to why diesel never really took off, you can expect these reasons to get corrected and improved in the future, meaning that you will see more and more diesel vehicles on the road.
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Diesel engines are the combined inventions of two specific inventors, Rudolph Diesel and Herbert Akroyd Stuart. The internal engine is strictly from Diesel and the injection system is derived from Stuart. Stuart is best known for his advances in solid injection. Solid injection is derived from compressing fuel to extremely high pressures by means of pumps. It is then forced under pressure through injectors into the combustion chamber. Diesel’s original engine injected fuel by means of compressed air into the cylinder. The fuel was atomized and mixed with air and then injected. This was “air-blast" injection. The early models of diesel engines were extremely large and heavy due to the large compressors needed as part of its’ fuel injection system. Naval diesels were so large that they needed separate engines just to compress the air required to power the diesels. During the earlier years, the use of diesel engines with automobiles was not feasible.
Today’s diesel is a miracle of innovative genius. No longer is the engine serviced by a mechanical fuel pump but by ECM run fuel pumps, which service the individual injectors at the proper and accurate opening times. The distributor pump direct injection method was improved vastly by the Volkswagen Audi group in 1989. The genie in the bottle or the ECM (the electronic control module) made the injection timing, fuel measurement, exhaust recirculation and turbo boost precise and accurate. They provided the incentive for diesels to be marketed to the mass market. Consequently, Volkswagen began selling their Mark 3 Golf TDI very successfully. European automobile manufacturers build common rail direct injector diesel engines, a means where the distributor injection pump is deleted and a high-pressure reservoir stores the fuel at extremely high pressures. The computer-controlled injectors have a precision system actuated by solenoid or even piezo-electric actuators and are used to inject diesel fuel at the correct time. This high performance diesel engine is used primarily for racecars.
So why should someone buy a diesel? Diesel fuel is denser than gasoline by 15%. The diesel engine must be larger in order to put out the same power as a gasoline engine. The size of the diesel engine has with the assistance of turbo charging, precise timing and feed back allowed it to operate under pressures impossible with gasoline engines. This means a more efficient and powerful engine. Therefore, if you want a faster, more economical and environmentally safer automobile then choose a diesel.
If you are concerned about the diesel knock then a diesel rail injection system with a two-stage injection system can completely rid your vehicle of the dreaded diesel knock. In the department of emissions, diesel engines rate very environmentally friendly since they produce little to no carbon monoxide. The higher PM10 (or particulate matter greater than or equal to 10 microns) emission occurs when diesels are not equipped with diesel particulate filters. The other pollutant gases of sulfur and nitrogen oxides are eliminated by catalytic converter.
The diesel is renowned for the power and torque required for towing heavy loads. It is reliable and easier on engines to start than gasoline engines because there is less wear and tear due to the lower pressures. Last, a diesel offers many types of effective and inexpensive fuels such as the biodiesel fuels found in vegetable oils and used vegetable oils.
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