P/N 11934-003
7-43
Cirrus Design
Section 7
SR20
Airplane Description
Engine
The SR20 is powered by a Teledyne Continental IO-360-ES, six-
cylinder, normally aspirated, fuel-injected engine de-rated to 200 hp at
2,700 RPM. The engine has a 2000-hour Time Between Overhaul
(TBO). Dual, conventional magnetos provide ignition.
The engine is attached to the firewall by a four-point steel mount
structure. The firewall attach points are structurally reinforced with
gusset-type attachments that transfer throughst 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 to the engine-mounted oil cooler. The oil cooler is
equipped with a pressure relief and temperature control valve set to
bypass oil if the temperature is below 170
°
F or the pressure drop is
greater than 18 psi. Bypass or cooled oil is then directed through the
one-quart, full-flow oil filter, a pressure relief valve, and then 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.
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
Revision A5
Содержание SR20
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