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SECTION II
THE
PIPER
COMANCHE
speed, controllable unit,
It is controlled entirely by use of the
propeller control located in the center of the lower instrument
panel.
INDUCTION SYSTEM
The Lycoming engine induction system in the Comanche is
equipped with a Marvel
Schebler model MA-4-5 carburetor or
a Bendix RSA-5ADI
fuel injector.
The carburetor
installed on the O-540-E engine is of the
single barrel float type, and is equipped with a manual
altitude
mixture control and an idle cut-off.
Distributionof the fuel-air
mixture to eachcylinder isobtained by the center zone induction
system,
which is integral with the oil sump
and is submerged
in oil, insuring a more
uniform vaporization
of fuel.
From
the riser the fuel-air mixture
is distributed to each cylinder.
The fuel injector installedon the I0-540-D engine is based
on the principle
of measuring air flow and using the air flow
signals to operate
a servo valve.
The accurately
regulated
fuel pressure
established
by the
servo
valve,
when
applied
across
a fuel control (jetting system),
makes
fuel flow pro-
portional to air flow.
Fuel
pressure
regulation,
by
means
of the
servo
valve;
necessitates
only a minimum fuel pressure
drop
through
the
entire metering
system.
This
makes
it possible
to maintain
metering pressure above vapor forming conditions,
and at the
same
time requires a fuel inlet pressure
sufficiently
low so
that a diaphragm pump can be used. An inherent feature of the
servo system is self-purging which eliminates any possibility
of vapor
lock and
associated problems
of
difficult starting.
The injection system components consists of a Servo Reg-
ulator which meters fuel flow in proportion to air flow to the
engine, giving proper fuel-air mixture at all engine speeds.
A
Flow Divider receives the metered fuel and accurately divides
fuel flow to each cylinder Fuel Nozzle.
6
640901
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