Intake Components

INTAKE SYSTEM

The intake system consists of an air cleaner, a surge tank, a reed valve, and a relief valve. All work together to provide the correct amount of air over the entire range of the engine's performance requirements, from low to high speeds.

SIDE VIEW

SECTIONAL SIDE VIEW

Surge Tank

The surge tank is an alloy air chamber that can hold large amounts of compressed air under constant pressure. The relief valve and the reed valve are located in the surge tank.

Relief valve

The relief valve releases excessive boost pressure in the surge tank if boost pressure becomes to high. This is a back up system to the waste gate. If the wastegate actuator valve should fail, the relief valve will open the surge tank, reducing the excess boost pressure and thus protect the engine.

Relief valve setting pressure: 98.1 kPa (1.0 kg/cm², 14.2 psi)

Reed valve

The reed valve opens at low engine RPM when the turbocharger does not provide sufficient boost pressure. In this way, turbo lag is largely eliminated and better throttle response can be obtained.

SECTION BB RELIEF VALVE

SECTION A A REED VALVE

NOTE: The relief valve assembly must be installed into the surge tank with the arrow pointing upward; see the illustration.

Drain valve:

This valve is provided to drain the surge tank of trapped fuel. It remains open when the engine is at a stop but starts to close as the surge tank is charged.

Drain valve closing pressure: 4.9 kPa (0.05 kg/cm², 0.7 psi)

DRAIN VALVE