Purpose, Function
By lengthening the exhaust passage, the transmission of exhaust pressure waves to other cylinders can be delayed, and the amount of gas exhausted from a cylinder and forced back inside the combustion chamber is reduced By reducing the residual gas, the temperature inside the combustion chamber is reduced and the occurrence of knocking even at a high compression ratio is inhibited.
Construction
The exhaust manifold is installed to the rear of the engine. In addition, the catalytic converter (WU-TWC) is integrated (WU-TWC).

When the No.1 cylinder is at the intake stroke, the No.3 cylinder is at the exhaust stroke. By inducing the high temperature gas exhausted from the No.3 cylinder into the No.1 cylinder, the high temperature gas in the No.1 cylinder remains. If the amount of residual gas is high, the temperature in the combustion chamber rises and knocking can easily occur. With the 4-2-1 exhaust system, the transmission of exhaust pressure waves between each cylinder is delayed by the long exhaust pipes.

Exhaust System Removal/InstallationFront Wiring Harness Protector Removal/Installation
Front Wiring Harness Protector No.1
1. Disconnect the negative battery cable..
2. Remove the air cleaner case..
3. While pressing the tabs of clip A in the direction of the arrows (1) shown
in the figure, pull clip A in the direction of the arrow (2) shown in the figure
to detach the tab of ...
Ignition Coil [Skyactiv G 2.0]
Purpose, Function
The ignition coil generates high voltage by electromagnetic induction to
discharge the spark plug.
Construction
The ignition coil is installed to the upper part of the spark plug (direct
ignition coil).
With the adoption of the direct ignitio ...
Child-Restraint System Installation
Child-Restraint System Types
In this owner's manual, explanation of child-restraint systems is provided for
the following three types of popular childrestraint systems: infant seat, child
seat, booster seat.
NOTE
• Installation position is determined
by the type of child-restraint sys ...