The,Fuel,Injection,about,Carbu car The Fuel Injection about Carburetor (2)
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CostCost is another major reason for choosingcarburetors over fuel injection. Even though most cars today use fuelinjection, carbs are still plentiful and relatively cheap. Used ones can bepicked up at swap meets, via other car enthusiasts, speed shops or on the web.In addition, aftermarket manufacturers, including Barry Grant, Edelbrock andHolley, sell a huge range of brand new carburetors, designed for everythingfrom mild street driving to all out drag and road racing. In addition, thereare numerous specialists out there to assist with tuning and rebuildingcarburetors. How Carburetors WorkIn very basic terms, think of a carburetoras a length of pipe. At one end of the pipe is moveable flap that opens andcloses the throttle plate. This controls the amount of air entering the pipe.Further down, the pipe narrows inward (the venturi). On this section of thepipe theres a small hole, housing a jet, which squirts fuel into the venturi.Automotive carburetors use three cycles or circuits to deliver fuel: idle, partand full throttle. Depending on how much the throttle plate is open, a certainamount of fuel is needed in proportion to the air rushing in order to allow thespark to ignite the mixture and fire the engine. The theoretical ideal orStochimetric ratio for complete combustion is 14 parts air to 1 part of fuel(14:1); however, in practice, that is rarely achieved with carburetors. A cold engine requires more fuel to operatethan one thats warmed up, since fuel is the more combustible of the twoelements that need to be ignited by the spark. In the simplest of terms, the throttleplate, besides controlling the amount of air flowing into the carb, alsocontrols the amount of vacuum in the venturi on both the top and bottom sidesof the carb. On the bottom side, when the plate is closed, theres a buildup ofvacuum. By placing a secondary jet right below the throttle plate (the idlejet), the fuel can be drawn down the venturi more quickly and into the manifoldand combustion chamber. This results in a richer air/fuel mixture, allowing theengine to start more easily when cold. (In addition, a manually-adjustablemixture screw can also alter the air/fuel ratio under certain operatingconditions). In most automobiles, a secondary, moveable plate, called the chokeplate, is mounted below the throttle plate. When the engine is cold, it fullyblocks the flow of air through the venturi from the top side of the carb. Asthe engine warms up, the choke plate is pulled back, increasing airflow andreducing the flow of fuel from the idle jet. Chokes on automotive carburetorsare either operated manually (often via a lever), or automatically, via anelectrical wire and heating element thats linked to the ignition system andfuel cut-off valve. As the electrical current warms up, the heating elementexpands, gradually opening the choke plate. The level of heat passing throughthe electrical current determines how much the choke is opened (more underwarmer conditions, less under colder ones). Once the engine warms up, the carbswitches from the idle circuit to the part throttle circuit, relying on themain jet to deliver the fuel. At full throttle, the main jet and air bleed jet(mounted at the top of an emulsion tube) provide fuel delivery. (The emulsiontube is a bit like a straw, which pre-mixes the air/fuel before it reaches theventuri and combustion chamber, to reduce the risk of detonation.) Find out more about Nissan Z24 carburetor by visit miparts.com.
The,Fuel,Injection,about,Carbu