When it comes to engines, most Americans are more acquainted with gasoline engines than diesel, probably because they are more familiar with gas engines than diesel parts. The times are changing, and more vehicles today are diesel engines.

The diesel engine has been used since the 1890s. Rudolf Diesel, a German inventor, created an efficient compression ignition and internal combustion engine. However, the early diesel engines were larger than used these days and operated at lower speeds.

But just like any other invention, diesel engines have also gone through many improvements. Today, the new diesel technology ensures a more efficient fuel economy, cleaner air, and less noise. Despite this engine being in the industry for about a hundred years now, some are still unaware of how diesel engines work. So, if you have various questions about this type of engine, here is a guide to understanding diesel engines more.




Read More: Diesel versus Gas Engines: Expectancy, Emissions, and Efficiency


Fuel Efficiency


Today's diesel technology can function and create more power with lesser fuel consumption. Compared to gas engines, diesel engines have higher cylinder pressures and corresponding higher temperatures that help in improving their thermal efficiency. Furthermore, diesel engines compress air to one out of 20 parts per volume, only sending a small amount of fuel to the cylinder.

Emission Control


Compared to gasoline engines, diesel engines are proven to be more efficient not just by fuel consumption but also when it comes to helping the environment. Because less fuel is being used with diesel engines, trucks tend to emit less carbon dioxide than gas engines. The diesel technology also uses a wide range of renewable fuel that significantly helps push environmental movements such as cleaner air, lower emissions, and a more sustainable environment.

Start of Injection vs. Timing


Both gas and diesel engine users often use the word timing. However, this term has different and specific meanings depending on the engine you are using. For gasoline engines that use spark to ignite, the timing refers to the start of combustion.

On the other hand, for diesel engines that use air compression to start, the timing is about the SOI or start of injection. The SOI is when the injector begins to spray fuel into the cylinder. Another difference is that injectors are more critical of diesel engines than gas engines.

Engine Noise


Back in the day, diesel engines were admittedly louder than gas engines. Diesel engines create more noise while burning fuel because diesel has much bigger molecules than diesel. Apart from that, diesel engines also run on high compression. Because of this, the generated heat leads to the fuel's self-ignition, resulting in clattering noises.

Diesel engines are still admittedly noisier than gas engines even today. Compared to diesel engines ten years ago, new vehicles on the market with diesel engines are much quieter. This was made possible through its staged injection. The staged injection means that the fuel pulse breaks up into different stages with the pilot, combustion, and post-combustion as its injector pulses.



Torque is defined as a twisting force that causes rotation; it indicates the drive shaft's force. When it comes to diesel engines, the torque provides power for the rotation of the pistons in the machine.

Diesel engines are built and designed with longer strokes, producing more torque and power. A longer stroke gives the pistons more force; this creates more pressure in the cylinder, enabling the engine to build more torque and power.

Moreover, diesel engines use air compression to combust the fuel. The faster the compression rate, the quicker the fuel combusts; this allows the fuel injection to build on the torque level.



When it comes to maintenance, gasoline engines will cost you less. Diesel engines hold more oil which makes them more expensive to change. Additionally, diesel engines also require a lot of filters and components that you won't find on a gasoline engine. The newer diesel engines also need diesel exhaust fluid that might add to your expense.

However, diesel engines have lesser components which means they have lower maintenance rates than gasoline-powered vehicles. Diesel engines are also built with heavy-duty components to withstand heavier tasks. This is why diesel engines experience less wear and tear than gasoline engines, which means that you will spend less time in the shop.

In conclusion, there are so many advantages that you can find if you use a diesel engine. Although they also have their fair share of disadvantages, the number of benefits you can get can outweigh its cons.

Now, if you are already convinced and are planning to purchase a new diesel engine vehicle, you may use this guide to ask all the necessary questions that will help you choose the right vehicle. On the other hand, if you already own a diesel engine truck and need diesel engine performance upgrades, you can check out Pure Diesel Power.

Pure Diesel Power is your local diesel engine performance shop located in Central Wisconsin. Our team comprises truck experts readily available to assist you with vehicle needs. You can reach us Monday through Friday, 9:00 am to 5:00 pm CST. Please call us at 715-254-1833, email us at [email protected], or visit us at 2600 South Galvin Ave, Marshfield, WI 54494 or www.puredieselpower.com.