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

In a port and helix fuel injection system, the amount of fuel delivered to the cylinder for combustion is primarily determined by the position of the helix in relation to the port. This is because the design of the system often incorporates a helix mechanism that controls the flow of fuel into the combustion chamber. As the helix rotates or adjusts its position, it modulates the amount of fuel that can pass through the port and into the cylinder. This precise control ensures that the correct air-fuel mixture is provided for optimal combustion efficiency and engine performance.

While factors like the temperature of the engine, fuel viscosity, and size of the combustion chamber can influence overall engine performance or fuel characteristics, they do not directly determine the delivery of fuel in the context of a port and helix fuel injection system. The primary mechanism at play in this situation is the relationship between the helix's position and the fuel port, which directly affects how much fuel is injected into the cylinders for combustion.