A direct port wet system has a central metering valve for nitrous oxide and fuel.

• A. It Uses Separate Metering Valves for Nitrous Oxide and Fuel
• B. True
• C. False
• D. It Uses a Central Valve for Nitrous Oxide Only

Answer: (B)

In a wet direct-port nitrous kit, the metering hardware is centralized so that both nitrous oxide and fuel are coordinated before they reach the intake. The central valve primarily controls the nitrous flow, and the fuel is metered within the same assembly to ensure the two streams stay in the correct proportion as they enter each port. This setup is essential because adding nitrous increases oxygen, so the system must add the right amount of fuel to maintain the proper air–fuel ratio at the moment of activation. Having a single central metering point for both components helps ensure consistent, balanced delivery across all cylinders, which is why this statement reflects how wet direct-port systems are designed.