Air Injection System (1988 and Earlier Models) (Mitsubishi Galant 5)

1. In addition to the intake and exhaust valves, each combustion chamber has a smaller injection valve (see illustration). This valve supplies a super-lean fuel mixture to the combustion chamber during the intake stroke. This super-lean mixture forms a vortex when entering the combustion chamber. The vortex continues to exist throughout the compression stroke and improves flame propagation after ignition, ensuring efficient combustion.



2. Air enters through the inlet port located next to the first throttle valve of the carburetor, then passes to the injection valve through a passage in the intake manifold and cylinder head, from where it is sucked through the injection valve opening into the combustion chamber.

3. The injection valve is operated by a fork-shaped rocker arm that also controls the intake valve (they are operated by the same cam). With this design, the intake and injection valves open simultaneously.

[The original material is here: mitsubishiman.ru]