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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 improving the consistency of the air/fuel mixture to reduce engine emissions and fuel usage. [1]
The diversion of warm air into the intake reduces the available power from the engine for three reasons: thermodynamic efficiency is slightly reduced, since it is a function of the difference in temperature between the incoming and exhaust gases; the quantity of air available for combustion inside the cylinders is reduced due to the lower ...
With the advent of advanced emission controls and more advanced fuel injection methods, modern vehicles do not have a thermostatic air intake system and the factory-installed air intake draws unregulated cold air. Aftermarket cold air intake systems are marketed with claims of increased engine efficiency and performance. The putative principle ...
Warm air from inside the engine bay is used opposed to air taken from the generally more restrictive stock intake. Warmer air is less dense, and thus contains less oxygen to burn fuel in. The car's ECU compensates by opening the throttle wider to admit more air. This, in turn, decreases the resistance the engine must overcome to suck air in.
Comparing air and water, air has vastly lower heat capacity per gram and per volume (4000) and less than a tenth the conductivity, but also much lower viscosity (about 200 times lower: 17.4 × 10 −6 Pa·s for air vs 8.94 × 10 −4 Pa·s for water). Continuing the calculation from two paragraphs above, air cooling needs ten times of the ...
The station air is generally totally dry (dry air is required for the instrumentation), so the air used to drive the rotor is injected with oil to lubricate the air motor. Safety protected inspection windows are provided for viewing the preheater's internal operation under all operating conditions.