Engine Exhaust; Engine Controls - Cirrus SR22 Pilot Operating Handbook

Cirrus Design Section 7
SR22 Airplane Description
right spark plugs. Normal operation is conducted with both magnetos,
as more complete burning of the fuel-air mixture occurs with dual
ignition.

Engine Exhaust

Engine exhaust gases are routed through a tuned exhaust system.
After leaving the cylinders, exhaust gases are routed through the
exhaust manifold, through a muffler located on the right side of the
engine or, airplane serials 0320 and subsequent, through mufflers
located on either side of the engine, then overboard through an
exhaust pipe(s) 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 (leans) the
P/N 13772-001 7-43
Revision A5