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Heated air inlet
A heated air inlet or warm air intake is a system commonly used on the original air cleaner assemblies of carburetted engines to increase the temperature of the air going into the engine for the purpose of increasing the consistency of mixing of the air and fuel in order to reduce engine emissions and fuel usage.〔"Automotive Mechanics: Service, Repair, Diagnostics"; James E Duffy, Martin T Stockel & Martin W Stockel; 1995; ISBN 0-85566-714-1〕
==Operating principle==
Heated air intake systems operate on the principle of increasing the temperature of the air×±, the fuel will more effectively stay in suspension in the air rather than falling out of suspension and forming droplets on the floor of the manifold. Warm air from the outside of an exhaust manifold is drawn up into the air cleaner to increase the air temperature as quickly as possible after the engine starts. The air cleaner assembly incorporates a thermostatic vacuum switch that responds to the air temperature after the air filter element and actuates a vacuum motor that moves the control flap to allow the air to be drawn from a cooler location such as the top of the engine bay or outside the engine bay. If the air becomes too cold, the thermostatic switch will automatically change back to drawing heated air from around the outside of the exhaust.
The system was often used with computerised carburettors or ''throttle body injection'' systems but is typically not used with multi-point fuel injection, as the problem of fuel falling out of suspension does not occur when the fuel injectors are located close to the inlet valves.
There are exceptions to this however. Some vehicles, such as the 1992 and 1993 Fox body Mustangs, do use such as a system even though they have multi-port fuel injection, presumably to help the air-fuel mixture burn at the proper rate in cold weather, as even though the fuel has finely atomized, it has not properly vaporized, and therefore flame propagation will be otherwise slower. These vehicles have a MAF sensor, Air Temperature sensor, and when equipped with the 2.3L 4-cylinder, two spark-plugs per cylinder. This combination ensures the air is just warm enough to vaporise the droplets and does very noticeably improve performance and emissions at the same time in cold, northern winter weather.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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