Engine (4.2L): Overview Land Rover Range Rover III facelift

OVERVIEW

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 3 mounting bosses between the 'V' of the cylinder block. Positive alignment with the drive belt is provided by a dowelled 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

1. A supercharger.
2. Two intercoolers.
3. An outlet duct.
4. A bypass valve.
5. A bypass valve actuator.
6. Fuel rails.

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

Scheme 17

Each of the 2 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.

Scheme 18

The outlet duct directs air from the supercharger into the 2 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.

Oil is drawn from the reservoir in the oil pan and pressurised by the oil pump. The output from the oil pump is then filtered, cooled and distributed through internal oil passages.

All moving parts are lubricated by pressure or splash oil. Pressurised oil is also provided for the timing gear chain tensioners and the piston cooling jets.

The oil returns to the oil pan under gravity. Large drain holes through the cylinder heads and cylinder block ensure the quick return of the oil, reducing the volume of oil required and enabling an accurate check of the contents soon after the engine stops.

System replenishment is through the oil filler cap on the LH camshaft cover.