![]() While sequential variable fuel injection has many. This design produces the best fuel atomization and precise distribution to each cylinder for the ultimate performance. Other multi-port systems will fire all the injectors in groups no matter if the cylinder is ready or not. The fuel injector is also timed with the intake valve opening, giving the ultimate control and is the most efficient way to deliver fuel into your engine. This location provides a more efficient mixture control thats unaffected by varying intake manifold runner temperatures and length. Key to the improved performance of a system like this is the fuel injector location, which is at the end of the runner on the intake manifold right before the air flow stream enters the combustion chamber. 1) Single-Point or Throttle-Body Injection 2) Multi-point Injection System 3) Sequential Port Fuel Injection System (SPFI) 4) Direct Injection System. Pro-Flo 4 EFI systems feature a high performance Edelbrock intake manifold with a 1,000 cfm throttle body, fuel rails and individual injectors for each cylinder. The OEM’s only utilized throttle body style injection for 9 years before transitioning to sequential port fuel injection for improved drivability and efficiency. Typically, the center cylinders run slightly richer than the outer cylinders, hindering tuning for peak fuel economy and peak performance. This can also cause the air/fuel mixture to separate as it flows to the cylinders, resulting in an uneven mixture between cylinders. The next schematic represents the different kinds of systems and how. The sequential injection permits a more precise control of air/fuel ratio to individual cylinders of the internal combustion engine than has heretofore been. Another drawback is the delayed throttle response since the fuel must travel through the intake manifold to the combustion chamber. The advancement in fuel injection technologies gave rise to various fuel injection arrangements such as throttle body fuel injection, multi-point fuel injection. The basic types of fuel injection systems are single-point fuel injection, multi-point fuel injection, sequential fuel injection, and direct injection. ![]() Mixing fuel this way allows for it to puddle and condense in the plenum of the intake manifold, a recipe for hard cold starts. Sequential fuel injection is in fact multipoint, as there is at least one injector for. It’s the most universal type of Electronic Fuel Injection system, but it’s not ideal for high performance engines. It basically just means there is at least one injector for each cylinder. In sequential port injection CNG engines, gas fuel is injected by fuel nozzle injector via intake port into combustion chamber. This design delivers the fuel into the air flow stream in the plenum similar to a carburetor. Throttle Body style EFI systems feature fuel rails and injectors mounted directly to a throttle body.
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