Back in the day, before injection systems for gasoline-powered vehicles were efficient and precise, there was the single-point injection. The single-point injection did its work by mixing air and fuel before the intake valve and then distributing the mixture to the cylinders of the engine in one way. Although this sounds good enough, a problem arising from this type of injection system is that the cylinders did not have an equal mix of fuel and air. The nearest cylinder to the intake valve gets a richer mix (which means it has more fuel) than the ones farthest from the opening of the intake valve.
Nowadays, technology has started to improve on injection systems to make them even more efficient and precise. There are two types of injection systems for gasoline-powered vehicles today: the multi-point fuel injection (MPFI) commonly known as port fuel injection (PFI) and the gasoline direct injection (GDI).
Port fuel injection is an injection system wherein somewhere along the intake valve, just before the combustion chamber, fuel mixes with the air. Each cylinder that leads to the combustion chamber has its own fuel injector, which mixes fuel and air equally — unlike the ones in the single-point injection.
On the other hand, gasoline direct injection is the more precise between the two. The intake valves of the GDI only takes in air and leads it to the combustion chamber because the fuel injectors will just be at the opening of the chamber itself, thus making the air and fuel mix only in the combustion chamber.
GDI has proven to be more efficient and precise when it comes to the usage of fuel. Today, when petrol sources are leaning toward a scarcity and there is a rise in fuel prices, people are slowly shifting to engines with gasoline direct injections. GDI systems is optimized because it only uses up fuel needed by the car — by only injecting the right amount directly into the combustion chamber. The system also gives the vehicle more control when it comes to using fuel, because in decelerating and cruising, a lesser amount of fuel is only needed for your car to keep going.
Even if it proves to be more fuel-efficient, the GDI system is more expensive than PFI. The GDI system needs more pressure, since the air and fuel only have little time to heat up. This means that the parts of the GDI should be more rugged so it can allow high pressure and heat. PFI proves to be better in terms of prices and availability since this type of injection system is more common for economy cars.
If you have any questions regarding replacing car parts, call the friendly and knowledgeable staff at Meyers Auto Parts (702 431 8000).
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