What is the difference between multi-point injection and direct injection?

[Phoebe]

Here are the differences between direct injection and multi-point injection: Control method: Direct injection is mechanical injection; multi-point injection requires injection based on signals such as air flow, water temperature, throttle opening, and engine load for knock. Characteristics: The engine has high fuel injection precision, and there is no need to worry about gasoline adhering to the intake manifold. Direct injection in the cylinder can increase the compression ratio, and atomized gasoline can directly reduce the temperature in the cylinder, achieving stratified combustion. The gas mixes with gasoline in the intake manifold, making the mixture more uniform. The angle of the injector is just right to face the valve, and during injection, gasoline can to some extent clean the carbon deposits on the valve, with good reliability and easy maintenance. The injector is not inside the cylinder, so it is not affected by high temperature and high pressure environments.

[LaGabrielle]

I've driven many cars, and multi-point injection feels like an old friend—familiar and reliable. It's a multi-point fuel injection system where fuel is sprayed into the intake manifold, with each pipe responsible for a cylinder. This design is simple, and repairs are cheap—for example, replacing an injector costs just a few dozen bucks. However, fuel consumption is a bit higher, and it's common in older cars. The ride is smooth, but acceleration feels sluggish. Direct injection is different—fuel is injected straight into the cylinder, making it very fuel-efficient with powerful acceleration, saving a lot on gas in city traffic jams while also being more eco-friendly. Unfortunately, it's prone to carbon buildup and requires regular maintenance and cleaning, or issues may arise. My advice when choosing a car is to consider your budget: if you want hassle-free ownership, go for multi-point injection; if you're after the latest tech, choose direct injection. In the end, each technology has its pros and cons, and daily driving still depends on actual driving habits and environmental factors.