Air Induction System; Engine Exhaust; Engine Fuel Injection - Cirrus SR22 Pilot Operating Handbook

C D
IRRUS ESIGN
SR22
rotary-type key switch, located on the instrument panel, 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 emer-
gency operations. The R and L positions are used for individual magneto
checks and for single magneto operation when required. When the battery
master switch is ON, rotating the switch to the spring loaded START posi-
tion energizes the starter and activates both magnetos. The switch automat-
ically returns to the BOTH position when released.
28 VDC for Starter operation is supplied through the 2-amp STARTER
circuit breaker on NON-ESSENTIAL BUS.

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 induc-
tion air door can be opened, allowing engine operation to continue as
described below. For additional information on the Alternate Air Control,
refer to Engine Controls -

Engine Exhaust

Engine exhaust gases are routed through an exhaust system. After leaving
the cylinders, exhaust gases are routed through the exhaust manifold,
through mufflers located on either side of the engine, then overboard
through exhaust pipes exiting through the lower cowling. A muff type heat
exchanger, located around the right muffler, provides cabin heat.

Engine Fuel Injection

The multi-nozzle, continuous-flow fuel injection system supplies fuel for
engine operation. An engine driven fuel pump draws fuel from the selected
wing tank and passes it to the mixture control valve integral to the pump.
The mixture control valve proportions fuel in response to the pilot oper-
ated mixture control lever position. From the mixture control, fuel is
routed to the fuel-metering 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, mixture setting, and
throttle angle. Manual mixture control and idle cut-off are provided. An
electric fuel pump provides fuel boost for vapor suppression and for
priming.
P/N 13772-006
Reissue A
Alternate Air Control
S 7: A
ECTION IRPLANE AND
description in this section.
S
YSTEMS
E
NGINE
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