![]() Sequential: Direct injection into the individual cylinders. This design produces the best fuel atomization and precise distribution to each cylinder for the ultimate performance. The various types of MPFI systems are: Simultaneous:Fuel is injected together to the cylinders. 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. Standards Multi-Port Fuel Injection (MFI) System has several advantages over the original Sequential Central Port Injection (SCPI) system, including port fuel. 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. 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. These systems have a fuel injector for each cylinder, usually located so that they spray right at the intake valve. The fuel injectors are in the intake manifold near the intake ports. It is a little more efficient and lowers emissions even further. Like multi-port injection there are one or two injectors per cylinder and only air goes through the throttle body. The OEM’s only utilized throttle body style injection for 9 years before transitioning to sequential port fuel injection for improved drivability and efficiency. Gradually, as new engines were designed, throttle body fuel injection was replaced by multi-port fuel injection (also known as port, multi-point or sequential fuel injection). Sequential Multi-Port Injection is an upgrade to multi-port injection. 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. Multi-port injection is the air/fuel delivery system used on most new cars. Another drawback is the delayed throttle response since the fuel must travel through the intake manifold to the combustion chamber. While sequential variable fuel injection has many. ![]() Mixing fuel this way allows for it to puddle and condense in the plenum of the intake manifold, a recipe for hard cold starts. Other multi-port systems will fire all the injectors in groups no matter if the cylinder is ready or not. The major difference between the two systems is that the aftermarket system. It’s the most universal type of Electronic Fuel Injection system, but it’s not ideal for high performance engines. These aftermarket kits can be found for 400 to 500, and use a simple Multi Port Fuel Injection (MPFI) system. 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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