Textron Lycoming O-540 Series - Page 17

TEXTRON
LYCOMING
OPERATOR'S
MANUAL
0-540
& 10-540
SERIES
SECTION
1
Induction
System
- Textron
Lycoming
0-540
series engines
are equipped
with
a Marvel-Schebler
MA-4-5
carburetor.
Particularly
good distribution
of the
fuel-air
mixture
to each
cylinder
is
obtained
through
the center
zone
induction
system,
which
is integral
with
the
oil sump
and is
submerged
in
oil, insuring
a more
uniform
vaporization
of fuel
and
aiding
in cooling
the oil
in the
sump.
From
the
riser
the fuel-air
mixture
is distributed
to
each
cylinder
by
individual
intake
pipes.
Textron
Lycoming
10-540
series
engines
are equipped
with
either
a Ben-
dix
type RS
or RSA
fuel
injector.
The
fuel
injection
system
schedules
fuel
flow
in
proportion
to air
flow
and
fuel vaporization
takes
place
at
the intake
ports.
A
brief description
of
the carburetor
and
fuel injectors
follows:
The Marvel-Schebler
MA-4-5
carburetor
is of the
single
barrel
float
type
and
is equipped
with
a manual
mixture
control
and
an
idle
cut-off.
The
Marvel-Schebler
HA-6
is a horizontal
mounted
carburetor
equip-
ped
with
a manual
mixture
control
and
idle
cut-off.
The
Bendix
RS
type
fuel
injection
system
operates
by
measuring
the
air flow
through
the
throttle
body
of
the
servo
valve
regulator
controls,
and
uses this
measurement
to operate
a
servo
valve
within
the
control.
The
regulated
fuel pressure
established
by the
servo
valve
is used
to
con-
trol
the
distributor
valve assembly,
which
then
schedules
fuel
flow in
pro-
portion to air flow.
The
Bendix
RSA
type
fuel
injection
system
is
based
on the
principle
of
measuring
air
flow
and
using
the
air
flow
signal
in a
stem
type
regulator
to convert
the air
force
into a
fuel force.
This
fuel
force
(fuel
pressure
dif-
ferential)
when
applied
across
the fuel
metering
section
(jetting
system)
makes
fuel
flow
proportional
to
air flow.
NOTE
The
letter "D"
used
as
the 4th
or 5th
character
in the
model
suffix
means
that
the basic
model
configuration
has
been
altered
by
the
use of
dual
magnetos
housed
in
a single
housing.
Example
- basic
model
10-540-K1A5
becomes
IO-540-K1A5D.
Operational
aspects
of
engines
are
the
same,
and
performance
data
for the
basic
model
still apply.
1-3