You may be wondering, should I buy a diesel powered truck, or a gas powered truck? Here are some facts to consider before making your decision. One big difference between a diesel engine and a gas engine is in the injection process. Most car engines use port injection or a carburetor. A carburetor mixes air and fuel long before the air enters the cylinder. In a car engine, therefore, all of the fuel is loaded into the cylinder during the intake stroke and then compressed. Diesel engines use direct fuel injection -- the diesel fuel is injected directly into the cylinder.
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The injector on a diesel engine is its most complex component. The injector has to be able to withstand the temperature and pressure inside the cylinder and still deliver the fuel in a fine mist. Getting the mist circulated in the cylinder so that it is evenly distributed may be a problem, so some diesel engines employ special induction valves, pre-combustion chambers or other devices to swirl the air in the combustion chamber to improve the ignition and combustion process.
Some diesel engines contain a glow plug. When a diesel engine is cold, the compression process may not raise the air to a high enough temperature to ignite the fuel. The glow plug is an electrically heated wire that heats the combustion chambers and raises the air temperature when the engine is cold so that the engine can start. Smaller engines and engines that do not have advanced computer control use glow plugs to solve the cold-starting problem. Glow plugs are rarely used today on larger engines. The ECM senses ambient air temperature and retards the timing of the engine in cold weather so the injector sprays the fuel at a later time. The air in the cylinder is compressed more, creating more heat, which aids in starting.
If you want a truck with lots of towing power, a diesel fuel injection system is the only way to go. If you want a fuel efficient commuter car for urban driving, consider a hybrid car, a turbo diesel-powered car, or a hybrid SUV. Diesel fuel injection engines are much better than gasoline engines in thermal efficiency. They have higher compression ratios and ability to run on very lean fuel mixtures, which enables them to get about 30% better fuel economy than a gasoline engine.
Have questions about diesel fuel injection vs. gasoline powered vehicles? Contact our ASE Certified Technicians at Wentland Diesel Service by calling 541-938-3875 or go on-line at http://www.wentlanddiesel.com/ for more information. Our auto shop provides car and truck repair, including diesel fuel injection service, to the vehicle owners in Milton-Freewater, OR, Walla Walla, WA, Pendleton, OR and surrounding areas.
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