Types of Truck Engines: Which Engine Is Best for Heavy-Duty Trucks?

In the heavy logistics and transportation industry, the engine is often referred to as the “heart” of a truck. Whether it is a long-distance tractor running on the highway or a special vehicle running in mines and construction areas, the selection of the right power system is a direct determinant for efficiency, fuel efficiency, and maintenance costs.

Today, commercial trucks can use diesel, gasoline, natural gas, hybrid or electric power systems. Each type of engine has its own advantages, depending on the vehicle’s purpose. This article will take you to understand the mainstream types and working principle of truck engines, and explore what kind of engine is the best choice for heavy-duty trucks in the current technological environment.

The Main Types of Truck Engines

Truck engines come in a wide variety of types, and are typically classified according to the type of fuel used and the working cycle.

Diesel Truck Engines

This is the most critical power source for heavy-duty trucks across the world. Diesel engines function on the basis of the compression ignition principle. A high compression ratio is attained in the diesel engine. Due to the high compression ratio, the temperature of the air present in the engine gets increased. This leads to the combustion of the diesel fuel injected into the engine.

Advantages: It is capable of producing a high torque at a lower speed. This property makes it the best option for the transportation of goods over a long distance. Diesel engines are known for their fuel efficiency. These engines are capable of running for millions of miles with proper maintenance.

Representative Brands: Across the world, the key players in the diesel engine market are Cummins, Volvo, and Mercedes-Benz. Especially, Cummins is being widely used on different brand trucks due to the facility of customization.

Gasoline Truck Engines

Gasoline engines are not common in heavy trucks. However, they are common in light trucks and pickup trucks. For instance, the Ford F-Series uses a gasoline engine. Spark plugs are employed to ignite the mixture of gasoline and air in the cylinders. This leads to combustion. It is the combustion that drives the pistons.

• Advantages: Lower cost, light weight, low noise.
• Disadvantages: Poor fuel efficiency, shorter lifespan under high-load conditions.

Natural Gas Truck Engines (CNG / LNG)

With the increasingly strict environmental protection regulations of various countries’ governments and the pursuit of clean transportation solutions by various enterprises, the natural gas engine has become an important alternative.

Principle: Generally, it is modified by the addition of spark plugs to ignite the engine based on the diesel engine block.

Natural gas engines are also popular in urban transportation, including municipal vehicles, buses, and local delivery fleets. However, in some areas, refueling infrastructure is not readily available. Additionally, vehicles that use natural gas require larger fuel tanks, thus reducing cargo space.

Hybrid Truck Powertrains

Hybrid truck engines use a combination of traditional internal combustion engines and electric motors. These engines are able to use a combination of both power sources depending on the driving conditions. Alternatively, hybrid truck engines are able to use a combination of both power sources at once.

Hybrid trucks are best used in urban logistics operations since such operations require frequent stops as well as short-distance driving. However, hybrid technology is likely to increase the cost of the vehicle due to additional components as well as battery systems.

Electric Truck Powertrains

Electric trucks are one of the latest trends in commercial transportation. Unlike traditional internal combustion engine trucks, electric trucks are driven entirely by electric motors powered by large battery packs.

The electric power system has many advantages: zero exhaust emissions, quiet operation, and the ability to instantly output strong torque, enabling powerful acceleration.

However, electric trucks still face some challenges. Compared to diesel trucks, their battery range is limited, especially during long-distance and heavy-load transportation. Therefore, currently, electric trucks are most suitable for short-distance transportation, such as urban delivery, port operations, and local delivery.

Comparison of Different Truck Engine Types

Each engine type offers unique advantages depending on the truck’s application. The following comparison highlights the main differences between the most common truck engines.

Engine Type	Power	Torque	Fuel Efficiency	Typical Use
Diesel	High	Very High	Excellent	Long-haul freight
Gasoline	Medium	Medium	Moderate	Light-duty trucks
Natural Gas	Medium	Medium	Good	Urban fleets
Hybrid	Medium	Medium	Good	City logistics
Electric	Instant torque	Limited range	Zero emissions	Short-distance delivery

From this comparison, it becomes clear that diesel engines still provide the best combination of power, torque, and efficiency for heavy-duty applications.

Which Truck with Which Engine is the Best Choice?

Selecting the right truck engine depends largely on how the vehicle will be used. Different industries and operating environments require different engine characteristics.

Long-Haul Freight Trucks

For heavy-duty towing vehicles that need cross-border or cross-provincial transportation, high reliability diesel engines are the first choice.

Suggested solution: Choose those vehicles with mature power systems. For example, heavy-duty trucks with Cummins power systems are popular among truck drivers because the maintenance network of Cummins engines is very well-developed around the globe. Even in remote areas, the spare parts supply and service support of Cummins are more reliable, which means less “down time”.

Urban Delivery Trucks

The urban distribution vehicles are normally operated within the city. There are frequent stop-and-go operations, so there is a need for good low-speed engine response. There are strict regulations on noise and emissions.

Hybrid and electric vehicles are gaining popularity in the urban logistics segment. For municipalities with an existing refueling infrastructure, a natural gas engine can be an alternative.

Construction and Mining Trucks

Construction sites and mining activities involve trucks that are to be used under extremely harsh conditions. These types of vehicles are required to carry heavy loads.

Heavy-duty diesel engines are generally preferred for such activities. The high torque generated by these engines along with their strong structure makes them a suitable choice.

Light-Duty Commercial Trucks

For smaller commercial vehicles such as service trucks or light delivery vehicles, gasoline engines may be used. These vehicles tend to carry smaller loads over smaller distances and may find the lower purchase price of a gasoline engine appealing.

In some cases, smaller diesel engines may be used if additional torque or fuel efficiency is needed.

The technology of truck engines is undergoing a major shift that has not been witnessed in a century. While electricity and hydrogen are picking up steam, it is envisioned that for a while to come, efficient and smart diesel engines will remain the foundation of the global logistics industry.

You are a private individual or a fleet owner. When choosing an engine, you should consider the technical heritage of the brand, the convenience of after-service maintenance, and power compatibility.