Instruksjonsbok Volvo A25D - A30D

Engine

Turbocharging In 1954, Volvo was the first manufacturer in the world to introduce mass-produced turbocharged engines for trucks. Since then, development of these engines has continuously resulted in Volvo engines with very high power in relation to cylinder displacement. Turbocharging and intercooling technologies combined with electronically controlled direct-injection give increased engine power/torque, improved fuel economy and reduced emissions of atmospheric pollutants. This is one of Volvo’s core values, environmental care. The turbo recovers otherwise unused energy in the engine’s exhaust system, which gives an increase in total efficiency. The exhaust gases drive a high-speed turbine. It is directly connected to a compressor, which in turn forces larger air volumes (oxygen) into the cylinders. This gives more efficient combustion and more engine power, without increasing engine displacement.

Intercooler Intercooling improves the engine’s power, torque, fuel economy and also gives lower emission values. The turbocharger increases the air temperature. If the air is cooled after the turbo, its volume is reduced and more air (oxygen) enters the cylinders. A25D and A30D are equiped with an air-to-air intercooler that effectively lowers the temperature of the air after the turbo. The hydraulically driven intercooler cooling fan adjusts the cooling effect to match operating conditions in order to ensure optimized combustion and lower emis- sions.

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