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

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
7-42 P/N 13772-001
Revision A5