7-38
P/N 13772-005
Section 7
Cirrus Design
Systems Description
SR22T
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 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 louvered vents in the bottom of the
cowlings. No movable cowl flaps are used.
Turbochargers
The TSIO-550-K has twin turbochargers which use exhaust gas flow to
boost induction air pressure for increased power. There is one
turbocharger on each side of the engine. The turbochargers compress
and raise the temperature of the incoming air before going to the
intercoolers. The dual turbochargers are lubricated from external oil
supply lines from a source at the bottom of the oil cooler. There is one
oil pressure actuated wastegate on the left side of the engine
controlling the amount of exhaust gas used by the turbochargers.
Control is accomplished by a diaphragm actuated valve sensing
differential pressure across the throttle plate and controlling the oil
return flow rate from the wastegate. An overboost valve in the
induction system provides protection from too much pressure by
actuating at overly high manifold pressures.
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