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with respect to the correctness of information in this document. Copyright by AUDI AG.
11
The closing of the injector produces a pulse which
propagates from the injector to the fuel rail and is
reflected back to the injector. In this connection, the
injector pintle and injector pintle seat are subjected
to a high mechanical load (bounce). A restrictor is
installed upstream of each injector to dampen the
pulses in the fuel rail. This restrictor dampens the
incoming and outgoing pulses and so prevents the
injector pintle from colliding with the injector pintle
seat.
The restrictor is mechanically press-fitted into the
fuel rail.
In-rail restrictor
to injector
Rail
Fuel line
Inlet restrictor
344_061
Note
When replacing the injector, pay attention
to the genuine parts number!
Piezo injector
To reduce particulate emissions still further and to
optimise combustion, 8-port injectors are used in
place of 7-port injectors. This enables the fuel to be
more finely atomised and provides a smoother
combustion process.
