Diesel engine operating temperature
Maintaining the temperature of the diesel engine within strictly defined limits is an important parameter for achieving optimal performance. It will depend on the design features and purpose of the engine, what operating temperature of the diesel engine will be normal for this or that engine.
We also recommend reading the article about it, how to independently clean and adjust diesel injectors. In this article you will be able to learn about the basic parameters in the process of regulation, and also about features of cleaning of injectors of the diesel engine.
The operating temperature of one engine may be significantly different from another. As for the diesel engine, its operating temperature (provided the unit is in good working order, cooling systems and other components) depends on a number of conditions.
Compression ratio
The diesel engine works on the principle of spontaneous combustion of the mixture from the contact of sprayed diesel fuel with heated air from compression. The more it is compressed (warms up) in the air cylinder, the more intense the outbreak occurs after fuel injection, while the amount of fuel supplied remains the same.
Dependence of flash efficiency on the degree of compression (increase in air temperature) affects the efficiency of the diesel engine. It turns out, engines with a high degree of compression can be considered more "hot".
It is also worth considering, that the degree of compression is increased only to certain limits. The fuel-air mixture in the cylinder must not explode from contact with heated air, and burn evenly. A sharp increase in the degree of compression can lead to uncontrolled ignition of the fuel, causing detonation, local overheating and accelerated wear of the cylinder-piston group.
Permissible operating temperatures of diesel internal combustion engines
The temperature of the diesel engine will directly depend on the type of engine. The process of mixture formation and combustion of the fuel-air working mixture depends on maintaining the operating temperature of the diesel unit., as well as the normal operation of other internal combustion engine systems.
After reaching the operating temperature, the evaporation time of diesel fuel is reduced to the optimal value, the period of self-ignition delay decreases. The fuel-air mixture burns evenly and fully, which leads to an increase in diesel efficiency, lower fuel consumption and reduced exhaust toxicity.
According to experts, the optimal operating temperature of the diesel engine is the temperature at the mark from 70 to 90 degrees Celsius. The allowable maximum during the operation of the diesel under load is to increase the temperature of the diesel engine to 97 degrees, but not higher.
Diesel does not warm up to the optimum temperature
In the process of heating a working diesel engine in idle mode, it is desirable to wait for the heating of the coolant to a temperature of about 40-50 ° C. With a strong minus overboard, the diesel can start to warm up only in motion. You need to start driving in low gear, following the mark close 2-2.5 thousand. rpm. When the temperature rises to 80 ° C, the load on the motor can be increased.
We also recommend reading the article about it, why diesel smokes black smoke. In this article you will learn about the causes of combustion of a diesel engine in different modes of its operation.
If the diesel does not reach operating temperature in motion, it says so, that there was a decrease in its efficiency. Power drops, the car accelerates worse, increasing fuel consumption, etc.. d. These symptoms may indicate the following malfunctions:
- engine cooling system malfunctions (thermostat);
- the degree of compression is not normal (low compression);
Diesel operation, which did not warm up to operating temperature, under heavy load leads to incomplete combustion of the mixture, active formation of soot, clogging of fuel injectors, accelerated wear of power unit components, soot filter failure, etc.. d.
An example is the clogging of the diesel injector spray. The quality of fuel spray is reduced, diesel fuel nozzle. Fuel begins to burn unevenly and untimely, burns on the piston and causes it to burn. The exhaust valve may also burn out. The result is a drop in compression, that is, the air in the faulty cylinders will not be able to compress to this temperature, at which combustion of the mixture will be optimal. Diesel engine in such conditions will not reach operating temperature, will have difficulty running "cold" and after warming up.
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