![]() The fuel jets are much smaller and fuel flow is limited mainly by the fuel's viscosity so that the fuel flow tends to be proportional to the pressure difference. The main disadvantage of basing a carburetor's operation on Bernoulli's Principle is that being a fluid dynamic device, the pressure reduction in a venturi tends to be proportional to the square of the intake airspeed. Instead, the airflow through the carburetor increases, which in turn increases the amount of fuel drawn into the intake mixture. ![]() In most cases (except for the accelerator pump), the driver pressing the throttle pedal does not directly increase the fuel entering the engine. The carburetor works on Bernoulli's principle: the static pressure of the intake air reduces at higher speeds, drawing more fuel into the airstream. Most engines use a single carburetor shared between all of the cylinders, though some high-performance engines historically had multiple carburetors. ( October 2022) ( Learn how and when to remove this template message)ġ979 Evinrude Type I side draft carburetorĪir from the atmosphere enters the carburetor (usually via an air cleaner), has fuel added within the carburetor, passes into the inlet manifold, then through the inlet valve(s), and finally into the combustion chamber. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. Colloquial abbreviations include carb in the UK and North America or Carby in Australia. The name is spelled "carburetor" in American English and "carburettor" in British English. Thus a carburetor mixes intake air with hydrocarbon-based fuel, such as petrol or AutoGas (LPG). ![]() The name "carburetor" is derived from the verb carburet, which means "to combine with carbon", or, in particular, "to enrich a gas by combining it with carbon or hydrocarbons". Diesel engines have always used fuel injection instead of carburetors. In addition, they are still widely used on piston engine driven aircraft. lawnmowers, generators, and concrete mixers) and motorcycles. Since the 1990s, carburetors have been largely replaced by fuel injection for cars and trucks, but carburetors are still used by some small engines (e.g. The primary method of adding fuel to the intake air is through the Venturi tube in the main metering circuit, though various other components are also used to provide extra fuel or air in specific circumstances. Two-barrel downdraft Holley 2280 carburetor Cross-sectional schematicĪ carburetor (also spelled carburettor or carburetter) is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. Similarly, an extremely rich mixture having a ratio of 9:1 is required during cold starting.For chemical reaction of carbon dioxide, see Carbonation. For idling, a richer mixture of about 14:I is needed. ![]() A leaner mixture of air-fuel ratio of 16:1 is sufficient while running on levelled roads. Relatively rich mixture of air fuel ratio of 12:1 is required by the engine while accelerating or running at high speeds. The carburetor is supposed to supply the fuel air mixture in correct proportion under different conditions of temperature, speed and load on engine. Vaporization is a change of state of the fuel from liquid to vapour whereas atomization is a mechanical breaking-up of the liquid into small particles so that every minute particle of the fuel is surrounded by the air. The term vapourization and atomization should be understood clearly. The process of breaking up and mixing the fuel with the air is called carburetion. Construction and Working, Diagram Of Simple CarburetorĬonstruction and Working, Diagram Of Simple Carburetor CARBURETORSĬarburetor is a device used for atomizing and vapourizing the fuel and mixing it with the air in varying proportions to suit for changing the operating conditions of engines.
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