What factor primarily determines the amount of fuel delivered to the cylinder in a port and helix injection system?

The amount of fuel delivered to the cylinder in a port and helix injection system is primarily determined by the position of the helix in relation to the port. In such a system, the helix plays a crucial role in controlling the timing and quantity of fuel that enters the combustion chamber. As the helix rotates or shifts, it aligns with the port to either allow or restrict the flow of fuel. This precise positioning is essential for achieving optimal fuel-air mixture ratios, which are critical for efficient combustion and engine performance.

While factors like temperature, quality of the fuel, and the size of the fuel injectors are important in the overall operation of the fuel system, they do not control the specific delivery mechanism during the injection process in the context of a port and helix system. The helix’s relationship to the port is what dictates when and how much fuel bypasses into the cylinder, making it the primary factor in fuel delivery in this type of setup.