Figure 3-10.  Internally-driven supercharger induction system.  Figure 3-9.  An example of a naturally aspirated reciprocating engine.  takes place and the air temperature falls due to absorption  of the heat by vaporization. The final vaporization takes  place as the mixture enters the cylinders where higher  temperatures exist. The fuel, as atomized into the airstream  limits. If the temperature of the incoming air at the entrance to  the carburetor scoop is 100 °F, there is approximately a 50 °F  drop in temperature because of the partial vaporization of the  fuel at the carburetor discharge nozzle. Partial vaporization  3-7 IN Hg ALg. MANIFOLD PRESS 35 50 10 15 25 40 30 20 45 50 -10 20 0 10 CARB. TEMP. C° Carburetor air temperature bulb Intake pipe Intake air duct Carburetor heat valve Manifold pressure Throttle valve Carburetor Supercharger