The major distinction between diesel and gas lies in
the type of ignition. While gas engines operate on spark ignition, diesel engines employ compression ignition for igniting the fuel. With compression, the air is drawn into the engine and subjected to high compression that heats it. The result is a very high temperature in the engine, much high than that of gas engines.
In diesel engines, air and fuel are both infused into the engine at different stages, as opposed to gas where a mixture of air and gas are introduced. The fuel is injected into the diesel using an injector wherein a gas engine, a carburetor is used for this very purpose.
With gas engines, fuel and air are sent into the engine at the same time, then compressed. The air and fuel mixture will limit fuel compression, and thereby hence the overall efficiency. Diesel engines only compress air, and the resulting ratio can be much higher.
Diesel engines are much more efficient and
preferable as compared to gas engines due to the
1. Diesel engines have overcome several
disadvantages of earlier models that featured higher
noise and maintenance costs. Now, they are quiet
and require less regular maintenance when compared
with gas engines of a similar size.
2. Diesel engines are more rugged and reliable.
3. There is no sparking at all as the fuel ignites. The absence of spark plugs or spark wires also helps to lower maintenance costs.
4. The fuel cost produced is 30 – 50 percent lower than gas engine fuel prices.
5. Gas burns hotter than diesel, and therefore they have a shorter life span when they are compared with diesel engines.