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valve on the air-induction system throttle body. The fuel-metering valve
adjusts fuel flow in response to the pilot controlled Power Lever
position. From the metering valve, fuel is directed to the fuel manifold
valve (spider) and then to the individual injector nozzles. The system
meters fuel flow in proportion to engine RPM, throttle angle, and
ambient altitude pressure. Manual mixture control and idle cut-off are
provided. An electric fuel pump provides fuel boost for vapor
suppression and for priming.
Engine Air Induction System
Induction air enters the engine compartment through the two inlets in
the forward cowling. The air passes through a dry-foam induction filter,
through the throttle butterfly, into the six-tube engine manifold, and
finally through the cylinder intake ports into the combustion chambers.
Should the dry induction filter become clogged, a pilot controlled
alternate induction air door can be opened, allowing engine operation
to continue. Refer to Engine Controls, Alternate Air Control.
Engine Fuel Ignition
Two engine-driven magnetos and two spark plugs in each cylinder
provide fuel ignition. The right magneto fires the lower right and upper
left spark plugs, and the left magneto fires the lower left and upper
right spark plugs. Normal operation is conducted with both magnetos,
as more complete burning of the fuel-air mixture occurs with dual
ignition.
March 2010
Information Manual 7-45
Cirrus Design Section 7
SR20 Airplane Description
Engine Exhaust
Engine exhaust gases are routed through a dual tuned exhaust
system. After leaving the cylinders, exhaust gases are routed through
the exhaust manifold, through mufflers located on either side of the
engine, and then overboard through exhaust pipes exiting through the
lower cowling. A muff type heat exchanger, located around the right
muffler, provides cabin heat.
Engine Controls
Engine controls are easily accessible to the pilot on a center console.
They consist of a single-lever power (throttle) control and a mixture
control lever. A friction control wheel, labeled FRICTION, on the right
side of the console is used to adjust control lever resistance to rotation
for feel and control setting stability. An alternate induction air source
control is also provided.
Power (Throttle) Lever
The single-lever throttle control, labeled MAX-POWER-IDLE, on the
console adjusts the engine throttle setting in addition to automatically
adjusting propeller speed. The lever is mechanically linked by cables
to the air throttle body/fuel-metering valve and to the propeller
governor. Moving the lever towards MAX opens the air throttle butterfly
and meters more fuel to the fuel manifold. A separate cable to the
propeller governor adjusts the governor oil pressure to increase
propeller pitch to maintain engine RPM. The system is set to maintain
approximately 2500 RPM throughout the cruise power settings and
2700 RPM at full power.
Mixture Control
The mixture control lever, labeled RICH-MIXTURE-CUTOFF, on the
console adjusts the proportion of fuel to air for combustion. The
Mixture Control Lever is mechanically linked to the mixture control
valve in the engine-driven fuel pump. Moving the lever forward
(towards RICH) repositions the valve allowing greater proportions of
fuel and moving the lever aft (towards CUTOFF) reduces the
proportion of fuel. The full aft position (CUTOFF) closes the control
valve.
March 2010
7-46 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Start/Ignition Switch
• Note •
Serials 1337 and subsequent: The Start/Ignition Switch is
located on the instrument panel.
A rotary-type key switch, located on the left bolster, controls ignition
and starter operation. The switch is labeled OFF-R-L- BOTH-START.
In the OFF position, the starter is electrically isolated, the magnetos
are grounded and will not operate. Normally, the engine is operated on
both magnetos (switch in BOTH position) except for magneto checks
and emergency operations. The R and L positions are used for
individual magneto checks and for single magneto operation when
required. When the BAT 1 master switch is ON, rotating the switch to
the spring-loaded START position energizes the starter and activates
both magnetos. The switch automatically returns to the BOTH position
when released.
Alternate Air Control
An Alternate Induction Air Control knob, labeled ALT AIR – PULL, is
installed on the left console near the pilot’s right ankle. To operate the
control, depress the center lock button, pull the knob to the open
　
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