Fuel Injection: Port vs. Direct
Fuel injection is a system that supplies fuel to an automobile’s engine. Fuel injection was first used in the 1950s, but has now come to replace carburetors as the fuel system of choice for all American vehicles. The two main types of fuel injectors are direct and central port injectors. Before choosing which type suits you it is beneficial to review the pros and cons of each style of fuel injection.
Central port injection is slightly older than direct injection, and for this reason is a cheaper choice. It is much more common for vehicles to have port style injection because it has been around longer and costs less than direct.
The materials required to create direct fuel injectors are often more expensive due to the fact that they have to endure more heat and pressure compared to other injection systems. Also, the precision required of the electronic equipment is increased. As far as costs, direct is going to set you back a few bucks.
The advantage of direct injection is its increased fuel economy, which occurs because the fuel is sent straight into the cylinder and more fuel remains as vapor. Direct injection design reduces the possibility that fuel turns into small droplets, which do not burn after having made it through the combustion chamber. Unburned fuel is wasted gas, and wasted gas means less fuel economy.