In the seventies, most vehicles that were made were equipped with thermostatic systems. The role of a thermostatic intake system is to set the air temperature of the tract flow. In order to maximize the performance of an engine, the air gets either cold, when the engine is warm or warm when the engine is cold.
Engine performance maximization is not the only improvement, as the energy consumption and the efficiency of the engine are both better. The engines that have carburetors have a simple ventilation system, which is cooling the air in a simple way. The air is mixed in the carburetor after exiting the filter housing and then it goes through the manifold and reaches the cylinders.
An air temperature sensor is an advanced piece of technology that is used in carburetor systems. The temperature of the flow is measured with the sensor, but the sensor has other purposes as well. The piece can close and open a flap, for letting the flow in, or for vaporizing the fuel. Making a good mixture may not be possible if the speeds are too high.
The intake system of a fuel injected car works in a totally different way. The air is taken through a plastic tube, in most cases. The tube has to be long, because the flow must be good and steady. The fluid passes through a filter and an Air Flow Meter. There are two types when it comes to an AFM: it can be vane, or it can be a hot wired one.
The vane type of meter is made with a flap that moves back, when the pressure of the flow forces it. Also, an AFM has a sensor that is similar, when it comes to functioning, with the ones contained by a carburetor engine. When a hot wired AFM is involved, it has wires with a steady voltage. Once the wires get cooled by the air flow, the voltage increases and a signal goes to a computer and the mixture is adjusted.
In a fuel injected system, a throttle chamber controls the flow. If the chamber becomes closed, a car may be stopping. Another component of the fuel injected system is the start valve, which is heated electrically. A choke of a carburetor works as the valve. The idle speed of a car can be changed by both of the components, as they handle the airflow.
With the aid of a K&N air intake system, cool air or a warm flow can be provided for an engine. Regardless of the fact that a vehicle may use a carburetor or fuel injection equipment, the main reason for using an intake system is improving the engine performance.