In Automobiles
In cars, carburetor heat may be controlled automatically (by a wax-pellet driven flap in the air intake) or manually (often by rotating the air cleaner cover between 'summer' and 'winter' settings). The air filter bypass found on aircraft engines is not used, because the air filter on automobiles is not exposed to the elements, and because the carburetor is usually mounted closer to the cylinder block, so that enough engine heat is transmitted through the structure to keep the venturi walls warm. However, this is not always sufficient, and some automobiles have a history of temporary engine failure (power output drops to zero until the engine sits long enough for the engine heat to melt the accumulated ice) during rain or snow conditions.
Automobile engines may also use a heat riser, which heats the air/fuel mixture after it has left the carburetor; this is a low temperature fuel economy and driveability feature with most benefits seen at low rpms.
Read more about this topic: Carburetor Heat
Famous quotes containing the word automobiles:
“Automobiles are free of egotism, passion, prejudice and stupid ideas about where to have dinner. They are, literally, selfless. A world designed for automobiles instead of people would have wider streets, larger dining rooms, fewer stairs to climb and no smelly, dangerous subway stations.”
—P.J. (Patrick Jake)
“Uses are always much broader than functions, and usually far less contentious. The word function carries overtones of purpose and propriety, of concern with why something was developed rather than with how it has actually been found useful. The function of automobiles is to transport people and objects, but they are used for a variety of other purposes—as homes, offices, bedrooms, henhouses, jetties, breakwaters, even offensive weapons.”
—Frank Smith (b. 1928)