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preflight, charge can be determined by ‘hefting’ the unit.
Revision A7
P/N 13772-001 7-41
Cirrus Design Section 7
SR22 Airplane Description
Engine
The SR22 is powered by a Teledyne Continental IO-550-N, sixcylinder,
normally aspirated, fuel-injected engine rated to 310 hp at
2700 RPM. The engine has a 2000-hour Time Between Overhaul
(TBO). Dual, conventional magnetos provide ignition.
Serials 0002 through 0819 before Service Bulletin SB 2X-71-06; The
engine is attached to the firewall by a four-point steel engine mount.
Serials 0002 through 0819 after Service Bulletin SB 2X-71-06 and
airplane serials 0820 and subsequent: The engine is attached to the
firewall by a six-point steel engine mount.
The firewall attach points are structurally reinforced with gusset-type
attachments that transfer thrust and bending loads into the fuselage
shell.
Engine Oil System
The engine is provided with a wet-sump, high-pressure oil system for
engine lubrication and cooling. Oil for engine lubrication is drawn from
an eight-quart capacity sump through an oil suction strainer screen
and directed through the oil filter to the engine-mounted oil cooler by a
positive displacement oil pump. The oil pump is equipped with a
pressure relief valve at the pump output end to bypass oil back to the
pump inlet should the pump exceed limits. The oil cooler is equipped
with a temperature control valve set to bypass oil if the temperature is
below 180°F (82° C). Bypass or cooled oil is then directed through oil
galleries to the engine rotating parts and piston inner domes. Oil is
also directed to the propeller governor to regulate propeller pitch. The
complete oil system is contained in the engine. An oil filler cap and
dipstick are located at the left rear of the engine. The filler cap and
dipstick are accessed through a door on the top left side of the engine
cowling.
• Caution •
The engine should not be operated with less than six quarts of
oil. Seven quarts (dipstick indication) is recommended for
extended flights.
Revision A5
7-42 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
Engine Cooling
Engine cooling is accomplished by discharging heat to the oil and then
to the air passing through the oil cooler, and by discharging heat
directly to the air flowing past the engine. Cooling air enters the engine
compartment through the two inlets in the cowling. Aluminum baffles
direct the incoming air to the engine and over the engine cylinder
cooling fins where the heat transfer takes place. The heated air exits
the engine compartment through two vents in the aft portion of the
cowling. No movable cowl flaps are used.
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 operated 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.
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
Revision A5
P/N 13772-001 7-43
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
　
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