At a meeting of a car club, a friend proudly showed his car temperature needle that indicates the position of a quarter, while in general for the same car should show half position. He considers the engine cooling system on the car works well and will be free from the problem of overheating. Meanwhile there is also a friend who just pull the thermostat from the engine for fear of overheating problems happen again.
Both of the above it also occurs in many other brands of cars, especially European cars. What negative impact for the car?
Car engines work optimally at temperatures high enough (about 93 ยบ C). If the machine is working at low temperature will make a rapid engine components were damaged, detonation, create pollution and wasteful of fuel.
For that most important thing done by all produksen cars are made so that the engine temperature immediately reaches its temperature and keeping it constant (stable).
In addition to the ideal engine working temperature, for the complete combustion process, it takes a mixture of gasoline and air are right.
The composition of gasoline and air mixture is often called the Air-Fuel Ratio (AFR).
Ideally worth 14.7 AFR. This means that the mixture consists of a grain of gasoline versus 14.7 grains of air or called by the term Stoichiometry.
In cold conditions, the engine requires more fuel (richer AFR) and the spin machine needs to be made higher in order to work properly and not shaking (coldstall).
When the engine reaches the ideal working temperature re-created nearly ideal AFR (AFR = 14.7).
Machines that still use carburetors, AFR setting process carried out through an automatic choke and choke and temperature using a vacuum solenoid vacuum valve.
At the injection machine, setting AFR performed by the ECU (Engine Control Unit - engine control computer) based on the reference water temperature sensor on the engine block (Coolant Temperature Sensor) to set the ECU then rev the engine and sprayed gasoline injector discharge.
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