What is the difference between multi-point fuel injection and direct injection?
2 Answers
The differences between direct injection and multi-point fuel injection can be summarized in six aspects: 1. Fuel quality: Direct injection has higher fuel quality requirements compared to multi-point fuel injection, with a compression ratio as high as 12. 2. Cost: Due to the more complex components of direct injection compared to multi-point fuel injection, the price is usually higher. 3. Fuel consumption: Direct injection has significantly lower fuel consumption compared to multi-point fuel injection. 4. Power performance: Direct injection improves power and torque by 10% compared to other engines of the same displacement. 5. Technology: Multi-point fuel injection technology is more mature, while direct injection is a newer and more advanced fuel injection technology. 6. Maintenance: Multi-point fuel injection has a simpler structure, making it better in terms of maintenance and reliability compared to direct injection.
I've driven quite a few cars and summarized the differences between multi-point fuel injection and direct fuel injection. Multi-point fuel injection sprays fuel near the intake port of each cylinder, which is simple, reliable, and cheaper to maintain, but it has slightly higher fuel consumption and less thrilling acceleration. Direct fuel injection, on the other hand, injects high-pressure fuel directly into the cylinder, resulting in more precise combustion, better fuel efficiency, stronger power, and quicker starts. However, it's prone to carbon buildup, requiring periodic engine cleaning; otherwise, the power will decline. Driving a car with multi-point fuel injection feels steady with few issues, making it suitable for city commuting. Direct fuel injection excels on highways but comes with higher costs and requires premium fuel. For regular household use, multi-point fuel injection is recommended, while those pursuing performance should opt for direct fuel injection—regular maintenance is key.
