P/N 11934-003
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.
Revision A5
Summary of Contents for SR20
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