Engine: Description and Operation: Overview

Overview




The engine is an 8 cylinder V-engine with 60 degrees angle between the two cylinder banks. A specially adapted exhaust system together with the offset crankshaft pins gives the characteristic V8 sound. The engine is transverse and is only available in combination with AWD.
The engine is mounted vertically on the subframe.
Displacement is 4.4 dm3. Each cylinder has four valves.
The engine has a variable intake system which gives high torque at low engine speeds (rpm) and high performance at high engine speeds (rpm).
The ignition system has directly installed ignition coils.
The engine has mechanical valve lifters and electronic throttle. The throttle body is heated by coolant which means that pre-heating of intake air is not required.
The engine has double pairs of overhead camshafts, driven by three maintenance-free chains.
The engine has a counter rotating balancer shaft which gives vibration free running.
The cylinder block is made of a light metal alloy.
The direction of cooling system flow allows the coolant to first cool the cylinder heads and then the engine block.
All auxiliary units, the alternator, servo pump and A/C compressor are directly mounted on the engine block.
95 RON fuel can be used for normal operation. 98 RON is recommend for maximum performance and lowest possible fuel consumption. When driving in climates hotter than +38 °C, fuel with the highest possible octane rating is recommended to ensure the best possible performance and fuel consumption.
The engine is regulated by the Engine Control Module (ECM). For information on sensors and the control module, see Design and Function, Engine Control Module (ECM).