Sunday, April 27, 2014
Types of Carburetor Chokes
Over the years, various models of carburetor chokes have been developed in order to facilitate different engine conventionalities such as differing engine designs, varying load requirements and air/fuel intake varieties. In essence, the varieties of carburetors have been specifically designed to provide an assortment of drafting amounts, a multitude of barrels and varying venturi and flow rates.
Carburetor Draft
The variation in draft technology is one way in which carburetor chokes can be classified. Drafting within carburetors can be defined as sucking in or exhaling out air. There are three main types of drafting technologies that can be incorporated into carburetors. These are downdraft, sidedraft and updraft models. The downdraft and updraft technologies work using a method completely opposite to each other. Downdraft allows air to flow through the engine in a downward direction whereas the updraft variety allows air to be transferred through the engine in an upward direction. On the other hand, the sidedraft variety allows air to flow through the engine in a horizontal manner. Sidedraft technology was incorporated into older vehicle models whereas downdraft technology is used in cars these days. However, updraft carburetors are used in machinery such as forklifts.
Carburetor Barrels
Carburetor barrels can basically be defined as a hollow cylinder in which air and fuel is mixed by the engine. The basic parts are the throttle plate, air horn and venturi. There are three essential types of carburetor barrel models; one-barrel, two-barrel and four-barrel carburetors. The one barrel model is primarily incorporated into small engines that do not require a lot of power such as a motorcycle. On the other hand, a two-barrel system is used in cars with large engines and comprises two throttle plates and double venturis. A four-barrel model is used with trucks and SUVs because it has the ability to provide a large amount of engine force. Under normal conditions, the engine uses only two of the four barrels. If extra power is required, the other two barrels are employed to mix in more fuel and air.
Feedback Carburetor System
In accordance with technological breakthrough of todays day and age, car makers have developed an electronic carburetor system that has the ability to provide highly efficient energy by electronically maintaining the levels of air and fuel. The electronic carburetor is used in almost all of the cars being built today and also has the ability to reduce pollution by oxidizing HC and CO as well as reducing the amount of nitrogen oxide expelled into the air. The entire system uses a three-way catalytic converter which maintains the most efficient mixture of air (oxygen) and fuel.
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