When gas is compressed, the temperature will rise, with diesel engines using this very property to ignite the fuel.
Air is then drawn into the cylinder and compressed by the rising piston at a much higher compression ratio than gas engines, up to 25:1, with the air temperature reaches 700 – 900 degrees C.
At the top of the piston stroke, the diesel fuel is injected into the combustion chamber at high pressure; then, it mixes with the hot, high-pressure air through an atomizing nozzle.
The resulting mixture will ignite and burn very rapidly. This combustion will cause the gas in the chamber to heat up rapidly, increasing pressure and forcing the piston downwards.
To get the most out of a diesel engine, a turbocharger to compress the intake of air is vital. The connecting rod will transmit this motion to the crankshaft. The scavenging of the engine is either done by ports or valves. the
You can also use an aftercooler or intercooler to cool the intake air after compression by the turbocharger to increase your efficiency further.
An important part of older diesel engines was the governor, which limited the engine's speed by controlling the rate of fuel that was delivered.
Unlike gas engines, the air that comes in is not throttled, so the engine would Overspeed if this wasn’t done. Older style injection systems were driven by a gear system that came from the engine.
The diesel engine is truly an advancement to vehicles as we know it. As technology gets better, you can expect the diesel engine to get better, possibly even proving just how much better it is to the gasoline engine.🙂
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 instead of gas, where a mixture of air and gas is 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 simultaneously, 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.
Advantages :
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 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. 😁
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