Supercharger

SUPERCHARGER

SUPERCHARGER (PART 1):

SUPERCHARGER (PART 2):

The supercharger is a compressor used to pump an air into the cylinders. This increases the concentration of oxygen and fuel in the charge to create a more powerful combustion inside the cylinder. This increases cylinder pressure upon ignition and creates more power.

As the supercharger compresses the air its temperature increases. This raise in air temperature reduces the potential for power gains. By installing intercoolers the air is cooled to overcome this.

The supercharger is an Eaton M112 unit attached to the three mounting bosses between the 'V' of the cylinder block.

Positive alignment with the drive belt is provided by a doweled mounting bracket. An eight-ribbed belt drives the supercharger, via the crankshaft, at 2.1 engine speed. The maximum pressure increase is approximately 0.8 bar.

On the 4.2L V8 supercharged engine the intake manifold is replaced by:
^ A supercharger.
^ Two intercoolers.
^ An outlet duct.
^ A bypass valve.
^ A bypass valve actuator.
^ Two intercooler adapters.
^ Fuel rails.

The supercharger has a sealed-for-life internal lubrication system.

Intercooler

Intercooler:

Each of the two intercoolers is a fin and tube air-to-liquid heat exchanger. Two rubber ducts, secured by clamp plates, provide the interfaces between the outlet duct and the intercoolers. After passing through the heat exchanger core, the air flows into individual outlets to the cylinders. At the rear of the LH intercooler there is a mounting boss for an air intake temperature sensor.

Outlet Duct

Outlet Duct:

The outlet duct directs air from the supercharger into the two intercoolers. A filler point for the intercooler coolant system is integrated into the front and right side of the outlet duct. This connection is not used on Land Rover vehicles. A vacuum take-off for the fuel pressure regulator/cruise control system is located on the right side of the outlet duct.

Isolating bolts, to reduce noise, secure the outlet duct to the supercharger and a rubber gasket seals the supercharger to the outlet duct interface.

Bypass Valve
The bypass valve attaches to an opening in the induction elbow and controls a bypass flow from the intercoolers back to the inlet side of the supercharger. At closed or partially open throttle settings (i.e. idle and most cruise conditions), the bypass valve is fully open to provide maximum bypass and optimum fuel economy. As the throttle opens, the bypass valve progressively closes to reduce the bypass flow and increase the pressure of air supplied to the engine for optimum power output.

Bypass Valve and Actuator

Bypass Valve and Actuator (Part 1):

Bypass Valve and Actuator (Part 2):

Bypass Valve Actuator
The bypass valve actuator is a diaphragm-operated actuator attached to the valve spindle of the bypass valve. A vacuum pipe connects the actuator to the induction elbow.

Intercooler Adapters

Intercooler Adapters:

The intercooler adapters provide an interface between the intercoolers and the cylinder heads, and also locate the fuel rails and injectors. One-piece gaskets seal the joints between the intercoolers and the intercooler adapters, and between the intercooler adapters and the cylinder heads.

Fuel Rails

Fuel Rails:

The fuel rails are installed on the intercooler adapters. A fuel crossover pipe connects the fuel rails together at the front of the engine.

Fuel Injectors

Fuel Injectors (Part 1):

Fuel Injectors (Part 2):

Eight, top fed, 12-hole, fuel injectors are installed in the fuel rails and are held in position by spring clips. Two O-rings are installed between the injector mounts of the fuel rails and the related recesses in the intercooler adapters. The injectors are electromagnetic solenoid valves controlled by the ECM. The fuel jets from the injectors are directed onto the back of the intake valves.