How Diesel Engines Work

Today, a diesel engine has proved to be extremely efficient and cost effective. If you wonder how diesel engines work, then you may find you answer in reading a few interesting information about the diesel engines.

You should know that after discovering oil to be an easily available resource for powering the cars, a fuel we now name diesel fuel was processed to power diesel engines. We know a diesel fuel is priced somehow higher than gas but what you should know about the diesel fuel is that it has a higher energy density. This means a more power can be withdrawn from diesel comparing it with the same amount of gasoline. Moreover, the diesel fuel is heavier and oilier compared with gasoline.


Returning to how diesel engines work, you should know that practically diesel and gasoline engines are rather similar. They are both internal combustion motors designed to change the chemical energy available in diesel or gasoline into mechanical energy. The mechanical energy moves the pistons up and down inside the piston chambers. All the pistons are connected to a crankshaft and the motion which is a linear up-and-down motion creates the rotary motion needed to rotate the prop on your used trawler.

The fist step in creating the rotary motion is given by the air which is drawn into the cylinder. The air is then compressed by the movement of piston and the fuel is injected as a vapor just before the piston contracts the top of the cylinder. The compression creates a raise in the air temperature, which makes the diesel fuel to combust. In the end, the waste gases are blown from the piston chamber into the exhaust system.

Very important in injecting fuel into the firing cylinder of diesel engines is the diesel injection pump. What you should know is that the spark plugs are not used to ignite the fuel, which is a different characteristic from the gasoline-powered engines. They rely entirely on the compressing of the diesel in the piston chamber to result in combustion. So, the diesel injection pumps are very important and must be built tough to create the compression value needed for the engine’s operation. Basically, the way how diesel engines work refer to the way the engines just pull in the air and start the combustion cycle. Diesel engines produce less power though than their turbocharged relatives.

A diesel engine requires stronger internal components such as the pistons and the crankshaft to withstand the continuous hammering from the diesel engine operating cycle. Thus, the design of a diesel engine is made to take hundreds of hours of constant use.