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 up. 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

where in 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

following reasons:

1. Diesel engines have overcome the 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 plubs or spark

wires also helps to lower maintenance cost.

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.

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