● Engine Cooling System

     Works cooling system described in the previous article, too, it relies on circulating coolant to the heat of the engine away and shed through the front of the radiator, cooling demand is indeed a foundation, Nissan GT1749V Cartridge and is now made to the engine cooling system higher demand, not only the heat, but also the ability to manage heat, thus ensuring that the engine reaches optimum operating temperature as quickly as possible and remain in such a state.

In the coolant temperature control, 4.0T engine equipped with our well-known thermostat to control the coolant circulation path, but the difference is that there are two ways you can let the thermostat opens. Paraffin wax element thermostat itself has internal thermal expansion characteristics, so that when (97 ℃) coolant reaches a certain temperature, the thermostat opens, which is generally controlled thermostat turned way; the other a bit like us often said that the active control, the heating element inside the thermostat can also trigger the thermostat is turned on at low coolant temperature, in other words, in practice, the magnitude of the thermostat is turned on can be active control. Control logic from the main reference engine computer (hereinafter referred to as "ECU") stored within the spectrum of the pulse, the system based on the information collected from the various sensors to determine the state of the thermostat.

     In fact, the electronic thermostat are already used in many models, however, although the control is more accurate, but under the action of the pump, the coolant still circulating in the engine, even if the engine can be shortened to achieve the best temperature time, but Audi engineers probably was not satisfied, so they imagine is not allowing the coolant to stop the cycle, Volvo GT1749V Cartridge so that the coolant heating rate can be further improved.

Thus, an innovative cooling solution to stop the flow switching valves appear on this 4.0T engine, this device is located upstream of the thermostat (in accordance with the direction of circulation of the coolant, the coolant to flow through the stop valve and then after switching the thermostat) this switching valve is controlled by a vacuum unit, camshaft-driven pump to create a vacuum environment, under the control of the solenoid valve is turned on or off in the manner of the stopped-flow switching valve control. When the coolant temperature is below 80 ℃, stopped-flow switching valve is closed, the coolant stops circulating. This concept supercharged engine in the Audi 3.0TFSI also reflected in different ways just to achieve.

     Speaking of the pump, which is the heart of the cooling system, is responsible for maintaining the cooling liquid circulating within the entire cooling system. 4.0T engine is a 4.2L naturally aspirated engine water pump pumps the basis for further improvements come, the water pump to drive (via the gear is connected to the crankshaft and oil pump) by the engine through a shaft.