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Workshop manual RR 4T - 400 - 450 - 525
HOMOLOGATION E3
The latest models are E3 type-approved and
they differ from prior approvals in that three de-
vices have been introduced:
AIS valve
It is called AIS 1 and it is an air intake system
which allows to complete the combustion of
some unburned fuels remaining from the ther-
modynamic cycle.
The catalytic converter
The catalytic converter is located at the end of
the exhaust pipe and is part of the muffler,
fixed to the exhaust pipe by spot welding in
two places.Its function is to reduce the harmful
substances present in the exhaust fumes,
specifically CO (carbon monoxide), the HC
(unburned fuel) and the Nox (nitrogen oxide).
Soundproof shell
This last device 2 located above the ai filter,
has the function of reducing the emission of
polluting gases and sound thus minimising
noise pollution.
USA HOMOLOGATION
Canister RS4T USA filter system
The extra system with a Canister 4 emission
filter and vacuum valve 5 prevent the release
of vapours into the atmosphere.
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