A. General Description
Functional descriptionMechanically controlled gasoline injection system with air flow sensor (abbreviated designation CIS)
A. General information
Brief designation of gasoline injection system: CIS
C = Continuously
The fuel is injected continuously in a finely atomized spray into the intake passage ahead of the inlet valves.
IS = Injection system drive
This injection system does not require to be driven by the engine.
Mechanical CIS requires no drive from engine.
The air aspirated by the engine is controlled by means of throttle valve and is measured with an air flow sensor installed prior to throttle valve. The fuel distributor dispenses the respective fuel quantity to the individual engine cylinders in accordance with the air volume measured.
The accurately measured fuel quantity is fed to the injection valves, from where the fuel is injected continuously and in finely atomized shape in front of the intake valves.
The mixture is adapted to operating conditions during cold start, during warm-up stage, as well as during acceleration and full load operation by means of pertinent additional equipment.
Function Diagram:
Components of CIS injection system (prior to September 1981)
Engine 116.960/961, 117.960/961
Characteristics:
^ Fuel distributor made of light alloy with integrated pressure compensating valve.
^ Fuel pump with external check valve.
^ Fuel reservoir located in parallel 1 connection on pressure side.
Components of CIS injection system (starting September 1981)
Engine 1 16.962/963, 117.962/963
Characteristics:
^ Electronically controlled idle speed adjuster.
^ Idle speed air screw, auxiliary air valve and pressure damper are no longer included.