Scirocco L4-1781cc 18L DOHC (1986) Fuel Injector Description
Fuel Injector: Description and Operation
Fig. 57 Injector
Fig. 15 Fuel Injector with Air Shrouding
The injectors in the CIS-E system, Fig. 7, open at a preset pressure. Fuel is always present in the lines between the fuel distributor and the injectors to
ensure good starting. As pressure in the fuel distributor increases, when the engine is started, the valves open and spray a constant stream of fuel. The
amount of fuel injected will be determined by control pressure and the position of the air flow sensor.
The injectors also incorporate "Air Shrouding" Fig. 15. In this system, a measured amount of metered air is allowed to flow around the injector
(primarily during high vacuum conditions) to greatly improve atomization at low airflow speeds.
