What does EFI mean for motorcycles?
3 Answers
EFI is a type of engine. Here are the detailed explanations: 1. The difference between EFI and carburetor engines: There are significant differences in operation methods. When starting an EFI engine (including cold starts), there is no need to press the throttle. This is because EFI engines are equipped with cold start enrichment and automatic fast idle functions, ensuring smooth starts whether the engine is cold or hot. 2. Precautions: Before and during engine startup, repeatedly pressing the throttle pedal quickly to increase fuel injection, as done with carburetor engines, is ineffective. This is because the throttle pedal in an EFI engine only controls the opening of the throttle valve, and the fuel injection amount is entirely determined by the computer based on intake air parameters. Additionally, EFI engines should not run for extended periods when the fuel tank is low on fuel, as the electric fuel pump relies on the flow of fuel through it for cooling.
I researched this when I last modified the fuel injection system. Motorcycle fuel injection is the electronic fuel injection system for motorcycles, acting like an intelligent fuel supply manager for the vehicle. It uses various sensors (such as throttle opening, air temperature, oxygen content, etc.) to collect data in real-time, which is then analyzed by the ECU computer board. This is much more precise than old-fashioned carburetors. After calculating the optimal air-fuel ratio, the computer immediately directs the injector to spray atomized gasoline in the right amount. The benefits are obvious: no need to pull the choke for cold starts, fuel consumption can be reduced by about 10%, and exhaust emissions are cleaner. However, it's important to note that fuel-injected bikes shouldn't use low-quality gasoline, as clogged injectors can be troublesome to clean. Nowadays, most new bikes above 150cc come with fuel injection—it's definitely a technological trend.
Seasoned motorcycle enthusiasts all know that the EFI system is the brain of a bike. The ECU is incredibly sensitive - it instantly calculates throttle opening angle, intake air volume, and exhaust oxygen content through six or seven sensors. The most impressive part is the closed-loop control with oxygen sensors, constantly adjusting fuel injection while riding, making power delivery exceptionally smooth during mountain climbs. My EFI bike had its ECU program modified, and after tuning, the acceleration became noticeably more linear. However, EFI bikes become troublesome when the battery runs low - you need a diagnostic tool to clear fault codes, and most ordinary repair shops can't handle it without this equipment.
