Intake System
Each cylinder has an intake manifold which comes from a plenum chamber. The injectors are on the lower aluminum intake manifold close to the intake valves. This is so that the fuel mixes as well as possible with the turbulent air. The position of the injectors is optimized to minimize wetting the cylinder walls. Thereby good emissions. There are ducts in the lower intake manifold for the crankcase gases so that they can reach the combustion chamber.
The air enters via the air intake, which is secured in the front member. In the inlet manifold, there is a rail that divides the pipe, to reduce the pressure-drop. Then the air passes in to the air filter housing. Here, there is also a so-called snow valve. This is opened if the air filter housing and air intake are clogged by snow. The air flow passes on and also cools the Engine control module (ECM) using cooling fins. The air flow continues on through a funnel and further to the mass air flow sensor. The mass air flow sensor measures the amount of air to the engine. Thereafter in a fresh air hose over the engine. Then the air passes the turbocharger and the charge-air cooler and continues to the electric throttle body and in to the inlet manifold. The EVAP-valve returns the fuel and air mixture for further combustion. The EVAP-valve is located by the throttle body.