AIR INDUCTION SYSTEM (AISI
ICARBIIiII
EB601000
AIR INDUCTION SYSTEM (AIS)
AIR INJECTION
This
system burns the unburned exhaust
gases
by
injecting fresh
air
(secondary air)
at the exhaust port. This is
to
reduce
the
output
of
the hydrocarbons.
When there is negative pressure around
the
exhaust port, the reed valve opens and
the
secondary
air
flows
into the exhaust port.
The required temperature
for
burning
the
unburned exhaust gases is approximately
600°
to
700°C.
VIEW
2.
(FLOW)
During normal operation the valve is open.
lAl
From the air
fiiter
[ID
To
the
reed valve
To
the
carburetor
joint
AIR CUT-OFF
VALVE
The
air
cut-off valve is operated
by
intake
gas pressure through the diaphragm. Nor-
mally, this valve is opened in order
to
allow
fresh
air
to
flow
into
the exhaust port.
When the throttle is rapidly closed, nega-
tive
pressure is generated and the valve
closes in
order
to prevent after-burning.
VIEW
1.
(NO
FLOW)
When decelerating (the throttle closes), the
valve
will
close.
[ftI
VIEW 1. (NO FLOW)
VIEW 2. (FLOW)
5 - 10
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