Differences Between a Diesel Engine and Gasoline Engine

If you are thinking about buying a diesel car or truck or becoming a diesel mechanic or just would like to compare a diesel powered vehicle to a more common unleaded gas powered vehicle, there are several things you need to take into account and understand. Each type of engine has its own advantages and drawbacks, so being aware of what you need and how you need it for your individualized lifestyle is extremely important.

Today’s diesel engines are not what they used to be ten or even five years back. Gone are the days of smelly exhaust and unacceptably noisy engine noise. Diesel engines are now considerably cleaner, have more power and are considerably more dependable. These are a few of the reasons that we are seeing an increasing number of common automobiles with diesel engines instead of the traditional gasoline engine.

Let’s look at several differences between these two engine types.

Which Engine Type is Better?

In theory, a diesel truck engine is very similar to the engine of a truck powered by gas. Both are internal combustion engines that are designed to transform one form of energy to another kind of energy. This energy then generates linear motion, which then causes forward motion to occur. The key distinction is how the combustion takes place. A gasoline truck engine has fuel combustion occur because of sparks from spark plugs. A diesel truck engine has the fuel combustion take place from the heat of the compressed air within the engine.

Engine Safety

As any diesel mechanic will tell you, although you can flame diesel fuel in the open air using merely a wick, it is far less explosive than gas and doesn't develop a flammable vapor. This means a diesel engine will never vapor lock. Furthermore, a diesel mechanic will confirm that the engines in diesel trucks will be more efficient because of their fuel efficiency, which is virtually constant as compared to the sporadic nature of a gasoline engine which often can use more fuel to get less power.

Engine Performance

As any diesel mechanic will advise you, what makes a car so appealing is its ability to accelerate rapidly. For this reason, we must evaluate the performance distinction between the two engine types. Because engines in diesel trucks and automobiles are focused on torque as opposed to horsepower, they're going to run more efficiently but accelerate fairly slowly in comparison. For most automobile owners, that lack of acceleration is unsatisfactory. For car owners who are seeking to use their car or truck for towing heavy loads such as campers or boats, a diesel engine makes more sense.

Efficiency of the Engine

When comparing a diesel engine to a gas engine, we can't ignore the efficiency between both engines. If you are looking for an engine that will be used long term, then a diesel engine is going to be right for you because you will save money over the lifespan of the engine. With 20 - 30% less fuel consumption, the savings can really add up. Diesel engines also have a longer lifespan than their gasoline counterparts. A typical diesel engine can last around 350,000 miles before requiring an overhaul, the gasoline counterpart is good for about 120,000 miles. Should you be looking for short term advantages, however, then a gasoline engine will be for you as it will take a few years for a gasoline engine to be less cost-effective overall than a diesel engine.

Ultimately the environmental advantage of using a diesel engine is what shifts the debate in support of using it primarily. The engines of diesel trucks and automobiles create only a minimal amount of carbon monoxide, so minimal, actually, that they can be utilized underground. Less carbon monoxide influence on our environment means a healthier planet, and that is something we should all be striving toward.