100%(1)1 out of 1 people found this document helpful
This preview shows page 56 - 59 out of 62 pages.
Gas units burn hotter than diesel units, and hence they have a significantly shorter lifecompared with diesel units.An 1800 rpm water cooled diesel unit operates for 12,000 to 30,000 hours before any majormaintenance is necessary. An 1800 rpm water cooled gas unit usually operates for 6000-10,000 hours before it needs servicing.Diesel fuel is one of the most efficient and energy dense fuels available today. Because itcontains more usable energy than gasoline, it delivers better fuel economy.Diesels have no spark plugs or distributors. Therefore, they never need ignition tune-ups.Diesel engines are built more ruggedly to withstand the rigors of higher compression.Consequently, they usually go much longer than gas-powered vehicles before they requiremajor repairs. Mercedes-Benz holds the longevity record with several vehicles clocking morethan 900,000 miles on their original engines! You may not want to hang onto the samevehicle for 900,000 miles, but longevity and dependability like that can sure help with trade-in and resale values.Because of the way it burns fuel, a diesel engine provides far more torque to the driveshaftthan does a gasoline engine. As a result, most modern diesel passenger cars are much faster
from a standing start than their gas-powered counterparts. What’s more, diesel-poweredtrucks, SUVs, and cars also can out-tow gas-powered vehicles while still delivering thatimproved fuel economy.Disadvantages of Diesel EngineIt expensive both in manufacturing (due to high work load) and also in maintenance. It isexpensive due to ecological incompatibility of its exhaust and due to necessity to adjust itsexhaust according to strict requirements of international agreements.The fuel in diesel engine is ignited by the heat of the compressed air. It results in that fact thatfuel had no time to fully mix with the air and it produces CH, NOX and carbon black duringthe combustion process.Although diesel fuel used to be cheaper than gasoline, it now often costs the same amount ormore. Diesel fuel is also used for commercial trucks, home and industrial generators, andheating oil, so as demand for diesel passenger vehicles grows, the price of diesel fuel is likelyto continue to rise because of competition from those other users.Even if the price goes up, diesel fuel would have to be 25 to 30 percent more expensive thangas to erase the cost advantage of a diesel engine’s greater fuel efficiency.Although diesel fuel is considered more efficient because it converts heat into energy ratherthan sending the heat out the tailpipe as gas-powered vehicles do, it doesn’t result in flashyhigh-speed performance. In some ways, a gasoline-powered engine is like a racehorse —high-strung, fiery, and fast — whereas a diesel engine is more like a workhorse — slower,stronger, and more enduring.Diesels still need regular maintenance to keep them running. You have to change the oil andthe air, oil, and fuel filters. Cleaner diesel fuels no longer require you to bleed excess waterout of the system, but many vehicles still have water separators that need to be emptiedmanually.
If you neglect the maintenance and the fuel injection system breaks down, you may have to