two and four wheeler carburetor
#1

hi am harish i would like to get details on two and four wheeler carburetor my frind justin said two and four wheeler carburetor are available heare iam studying in diploma in mechanical in siiddaganga polytechnic
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#2
A carburetor (British English, see spelling differences) is a device that combines air and fuel for an internal combustion engine in the ratio suitable for combustion. It is sometimes colloquially abbreviated to carbohydrates in North America or carby in Australia. A carburet or carburet (and therefore carburetion or carburetion, respectively) is to mix the air and fuel or to equip (a motor) with a carburetor for that purpose. Carburetors have been largely supplanted in the automotive industry and, to a lesser extent, in fuel injection aviation. They are still common in small engines for lawn mowers, rototillers and other equipment.

Principles

The carburetor operates according to the Bernoulli principle: the faster the air moves, the lower its static pressure and the greater its dynamic pressure. The throttle (throttle) coupling does not directly control the flow of liquid fuel. Instead, it drives the carburetor mechanisms that measure the flow of air being pushed into the engine. The speed of this flow, and therefore its pressure, determines the amount of fuel extracted in the air stream.

When carburetors are used in aircraft with piston engines, special designs and features are necessary to avoid fuel starvation during inverted flight. Later engines used an early form of fuel injection known as a pressure carburetor.

Most production carburetion engines, unlike fuel injection, have a single carburetor and a matching intake manifold that divides and transports the air fuel mixture to the intake valves, although some engines (such as engine Motorcycle) use multiple carburetors in divided heads. Multiple carburetor engines were also common enhancements for modifying engines in the US from the 1950s to the mid 1960s, as well as during the next decade of high performance muscle cars, catering to different manifold chambers The engine.

Older engines use upstream carburetors, where air enters below the carburetor and exits at the top. This had the advantage of never flooding the engine, as any liquid fuel droplet would fall out of the carburetor instead of entering the intake manifold; It also lent itself to the use of an oil bath air filter, where an oil pool beneath a mesh element below the carburetor is sucked into the mesh and the air is attracted through the oil-covered mesh, This was an effective system at a time when paper air filters did not exist.

Beginning in the late 1930s, downdraft carburetors were the most popular type for automotive use in the United States. In Europe, sidedraft carburetors replaced the downstream, as the free space in the engine compartment decreased and the use of the SU-type carburetor (and similar units from other manufacturers) increased. Some small propellers driven by aircraft engines still use the upstream carburetor design. Outboard motor carburetors are typically sidedraft, because they must be stacked on top of one another to feed the cylinders into a vertically oriented cylinder block.

The main disadvantage of basing the operation of a carburetor on the Bernoulli principle is that, being a dynamic fluid device, the pressure reduction in a Venturi tends to be proportional to the square of the intake air velocity. The fuel jets are much smaller and limited mainly by viscosity, so that the fuel flow tends to be proportional to the pressure difference. Therefore, the jets of size for full power tend to starve the engine at lower speed and part of the throttle. More commonly this has been corrected using multiple jets. In SU and other movable jet carburetors, it was corrected by varying the size of the jet. For cold start, a different principle was used in multi-jet carburetors. A throttle valve, similar to the throttle valve, was placed upstream of the main jet to reduce the intake pressure and draw extra fuel out of the jets.
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