Engine Lubrication System; Ignition And Starter System - Cirrus SR22 Pilot Operating Handbook

S 7: A
ECTION IRPLANE AND
E
NGINE
The oil pressure sensor is mounted below the oil cooler and provides a
signal to the Engine Airframe Unit that is processed and transmitted to the
Engine Indicating System for display.
Manifold Pressure Gauge
Manifold pressure is shown in the upper center portion of the ENGINE
page as both a simulated pressure gauge and as a digital value. The gauge
pointer sweeps a scale range from 10 to 35 inches Hg in 1 inch Hg incre-
ments. The digital MAP value is displayed in white numerals below the
gauge. The manifold pressure sensor is mounted in the induction air mani-
fold near the throttle body and provides a signal to the Engine Airframe
Unit that is processed and transmitted to the Engine Indicating System for
display.
Percent Power Gauge
Percent power is shown in the upper left corner of the ENGINE page as
both a simulated gauge and as a digital value. The percent power gauge
sweeps a scale marked from 0 to 100 percent in 5 percent increments. The
digital percent power value is displayed in white numerals below the gauge.
The display units calculate the percentage of maximum engine power
produced by the engine based on an algorithm employing manifold pres-
sure, indicated air speed, outside air temperature, pressure altitude, engine
speed, and fuel flow.

Engine Lubrication 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 approximately 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.

Ignition and Starter System

Two engine-driven magnetos and two spark plugs in each cylinder provide
engine fuel ignition. The right magneto fires the lower right and upper left
spark plugs, and the left magneto fires the lower left and upper right spark
plugs. Normal operation is conducted with both magnetos, as more
complete burning of the fuel-air mixture occurs with dual ignition. A
7-36
S
YSTEMS
C D
IRRUS ESIGN
SR22
P/N 13772-006
Reissue A