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Air Cooled vs Water Cooled Diesel Engines Which is Better

Nov. 18, 2025

Many people are unsure about which type of diesel generator set configuration to choose, such as Deutz air-cooled diesel engines and water-cooled diesel engines. Laypeople do not understand their respective advantages and differences, making it more difficult to make a purchase. Today, the editor from Dingbo Power, a generator manufacturer, will explain which one is better for you.


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1.No Need for Water Cooling System

Since air-cooled diesel engines operate by relying on forced ventilation to dissipate heat, there is no need to set up a water-cooling system. Components such as cylinder heads, cylinders, water pumps, radiators, and thermostats are not required, thus simplifying the structure and reducing costs. Compared with water-cooled diesel engines of the same power, air-cooled diesel engines are shorter in length and lower in height due to the absence of a radiator. Overall, the structure of air-cooled units results in a lighter and more convenient weight.

 

2.Good Low-Temperature Performance

Deutz air-cooled diesel engines adopt a deep combustion chamber and multi-hole fuel injection, making them easier to start in an environment of 20°C, especially suitable for cold regions and winter use. The fuel injection pressure required by the combustion chamber is relatively low, and the nozzle is not easy to block, which is not only reliable but also easier to achieve complete combustion, reducing air pollution and lowering fuel consumption and operating costs. The diesel engine can still start well at -35°C and is not easy to crack.

 

3.High Thermal Efficiency

Since air-cooled diesel engines have less heat demand from the air, the cooling air volume is only about 2/3 of that of water-cooled diesel engines. This is because, under a certain gas temperature, the higher the cylinder wall temperature of the air-cooled diesel engine, the less heat the Dingbo Power diesel engine emits into the air, resulting in lower fuel consumption. Usually, the cylinder wall temperature of air-cooled diesel engines is several degrees higher than that of water-cooled diesel engines, and in general, their thermal efficiency is higher than that of water-cooled diesel engines.

 

4.Long Service Life

Air-cooled diesel engines can avoid acid corrosion and wear to the greatest extent due to high temperatures, so their service life is longer.

 

In conclusion, Deutz air-cooled diesel engines are superior to water-cooled diesel engines and are the preferred type for us when choosing diesel generator set configurations. As a supporting manufacturer of the Deutz diesel engine brand, Guangxi Dingbo Power can supply users with 30-3000kw Deutz generator sets and has a professional technical team that can provide you with professional power solutions.

 

Dingbo Power has advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, and strong technical research and development capabilities. It can provide 3KW~2500KW various specifications of ordinary, automatic, four protection, automatic switching, low noise and mobile generator sets, high quality and low energy consumption to meet the diverse power needs of customers, and can also meet users with different voltages and different frequencies. It is required to create a parallel power supply system for multiple units. If you are interested in our product or any question on generator, welcome to send email to [email protected].

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