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There are various ways to classify the different types of carburetors, and one such way is to count the number of barrels they contain. A barrel is simply a container or passageway used to mix air and fuel. Carburetors come in one-, two- and four-barrel models. Smaller engines use one-barrel carburetors because they dont require as much power to operate. A larger carburetor would be too massive, as well. Two-barrel carburetors are the most common. Four-barrel carburetors are used with high-performance engines. Most of the time, only two barrels are used, but the additional two come into play when more horsepower is needed. Racecars are an example of the type of vehicle that would employ a four-barrel carburetor.

Two-barrel carburetors can be further divided into two subtypes. The first type is a model where each barrel contains all the necessary circuitry of a carburetor and a single common float chamber. The throttles in this type of carburetor can both be opened simultaneously. The second type is a bit more complicated. The two barrels share a single set of circuitry between the two, and each throttle opens at different times. The first barrel is used at idle to medium speeds, supplying its own mixture of air and fuel. The second barrel opens its throttle when the car moves into high speeds, requiring full throttle use. The second barrel at this time supplies additional air-fuel mixture to the engines cylinders.

Other types of carburetors are categorized based on how air flows into them. Side draft carburetors allow air to flow in horizontally and are easily mounted on engines when little space is available above them. Down draft carburetors, on the other hand, are set on top of the engine. They have larger barrels, and use gravity to help move the air-fuel mixture into the various engine cylinders.

A manual gearbox uses a clutch that connects the engines drivetrain. When you want to drive your vehicle, you choose the gear according to the cars speed. In addition, the car decreases speed when you shift the gears down. You should use the higher gears as you drive at a particular speed and use the lower gears as you slow down or pick up speed. Typically, manual gearboxes are fuel-efficient and cost less.

An automatic gearbox is a transmission that changes gears automatically without controlling a clutch. The vehicle depends on a torque conversion that effects the engine rpm and wheel rpm. The torque converter sits in the middle of the engine and transmission.

The word manumatic is a combination of the words manual and automatic. A manumatic gearbox is an automatic transmission that offers some characteristics of a manual gearbox. You can override the automatic mode by manually selecting a gearshift. Some other names for a manumatic gearbox include tiptronic, comfortronic, sportronic, sequential sportshift and touchtronic.