That allows the fuel a chance to condense, which means it won't combust as readily. All the valves release their fuel at the same time, which means some of the fuel is left waiting until the next intake stroke. The look of this type of injector led some people to refer to it as a spider injector.
Sequential fuel injection series#
In central port injection, a central fuel unit sends fuel down a series of legs which end in poppet valves. Two types of central port injection have been used and sequential multi-port injection. The injectors are mounted into the intake ports, just outside each cylinders intake valve. Multi-port injection (sometimes called multi-point injection) uses separate injectors to spray fuel into each cylinder. Cylinders closer to the throttle body might also receive a richer mix of fuel and air, compared to those cylinders farther away, which receive a leaner mix.Īlthough TBI did have the advantage of being simple by having only one or sometimes two injectors, it was eventually phased out in favor of multi-port injection. First, since the fuel has to travel a relatively long distance to the cylinders it can condense and pool in the intake manifold. TBI had certain problems in common with carburetion, though. That makes TBI more efficient than carburetion over a wider range of operating conditions. The vehicles onboard computer, the engine control unit (ECU), could control the amount of fuel metered out and the timing of the fuel. Throttle body injection was a big improvement over carburetion. The fuel and air mix in the intake manifold and are drawn into the cylinders by the suction produced during each cylinder's intake stroke. It worked very similarly to a carburetor in that it metered out fuel into the front of the intake manifold, behind the throttle body. Throttle body injection (TBI), also called single point injection was the first type of fuel injection widely in use in cars.
We'll walk you through the three types, explain how each one works, and describe the advantages and disadvantages of each type. The three major types of fuel injection are known as throttle body injection, multiport injection, and direct injection. Over time, the point of injection has moved closer and closer to the cylinders themselves. These can be split into categories based on where the fuel is added. Various methods of injecting fuel into the engine have been developed over time. Today, all new cars use some form of fuel injection. Fuel injected engines could produce more power, use less fuel, and more easily pass increasingly strict emissions standards. Eventually fuel injection was found to be more efficient. This system was relatively simple and easy to work on, and was successful for many years. In carbureted engines, the incoming air in the intake would create a vacuum that pulled fuel out of a tube in the carburetor called a venturi. Older engines used a carburetor to meter fuel to the engine. How the fuel gets to the cylinders, when the fuel gets there, and how the fuel is used are some of the most important factors in determining your engine's power and efficiency. To put it simply, your engine combusts a mixture of fuel and air inside its cylinders to move the pistons that create the forward or backward motion that's eventually transferred to the wheels.
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