Differences Between Direct Injection and Multi-Point Fuel Injection

[MadelynDella]

The differences between direct injection and multi-point fuel injection are as follows: 1. Different advantages: Direct injection gasoline engines have lower fuel consumption and higher power output. Multi-point fuel injection avoids the influence of intake manifold structure on mixture delivery and distribution, ensuring each cylinder receives the same mixture. 2. Different disadvantages: Direct injection requires more frequent replacement of components like spark plugs, while multi-point fuel injection engines have lower injection pressure and relatively higher fuel consumption. 3. Different principles: Direct injection directly injects fuel into the cylinder to mix with air, while multi-point fuel injection is accomplished through electronic fuel injectors. The fuel injection system consists of three main parts: the fuel injection circuit, sensor group, and electronic control unit, directly injecting gasoline into the intake manifold.

[DiPhoebe]

I'm an experienced driver and often talk about engines. The biggest difference between direct injection and multi-point fuel injection lies in the location and method of fuel injection. In multi-point fuel injection, the injectors are located near the intake manifold, where fuel is sprayed and mixed with air in the intake pipe before entering the cylinder for combustion. The advantages are simplicity, cost-effectiveness, and less carbon buildup, but the fuel doesn't burn as thoroughly, resulting in slightly higher fuel consumption and gentler power output. Direct injection, on the other hand, has injectors placed directly inside the cylinder. Fuel is sprayed in and mixed with air on the spot for combustion, making it much more efficient, fuel-saving, and powerful, delivering a more aggressive acceleration feel. The downsides? The system is more complex, operates at higher fuel pressure, and is prone to carbon buildup over time, requiring regular cleaning or maintenance with additives. Most new cars now use direct injection paired with turbocharging, making them feel like a whole different beast to drive—though repairs can be hard on the wallet. If you prefer hassle-free maintenance, older cars with multi-point fuel injection are great; if performance is your priority, direct injection is the way to go.