Fuel Injector: Description and Operation

2440 Injection valve EV-14

To support the reduction of emissions and the compliance with emission classification, EV-14 injection valves are employed. These injection valves fulfil all requirements of modern petrol injection systems in the intake pipe section.







Features of the injection valve:
- Slender valve shape (flexible installation and optimal adaption to engine requirements)
- Great variant diversity (geometry, jet shape of modified injection angles)
- Improved fuel/air mixture for reduction of emissions (finest nebulisation)
- Low weight (approx. 25 grams)

Construction of injection valve

Compared to the EV-6 injection valve known from the 911 Carrera (996) as of model year 2002, the outer diameter of the valve is reduced, the solenoid coil and the valve grouping are redesigned and the injection point is 5 mm further forward. The EV-14's valve housing in the fuel delivery area is made of rust-resistant steel.

This comprises the coil, the electric and the hydraulic connection. Located in the valve housing are the filter strainer, the movable injection needle with the armature and the valve seat with the perforated spraying disc. The EV-14's perforated spraying disc determines the jet shape, the fuel proportioning and the mixture formation - in other words, the optimal nebulisation of the fuel in the intake pipe. Two O-rings seal off the injection valve from the fuel distributor and the intake pipe.