Installation & Operation Manual
O-360 and IO-360 Series Engines
© March 2004 Superior Air Parts Inc. Chapter 6 • Normal Operating Procedures
9
Table 6-8 • Leaning with Exhaust Gas Temperature Gage
Normally aspirated engines with fuel injectors or carburetors.
Maximum Power Cruise (above
80% power) – Superior Vantage
Engines should not be leaned
when operating above 80%
power.
Best Economy Cruise
(approximately 80% power and
below) - Do not lean below peak
EGT on carbureted engines. Do not
lean beyond 50°F lean of peak on
fuel injected engines.
Table 6-9 • Leaning with Flowmeter
Lean to applicable fuel-flow values. Because of air-fuel mixture variations
on carbureted engines, this is recommended for fuel injected engines only,
unless otherwise recommended by airframe manufacturer.
*Omit step one for Rotorcraft shut down.
Table 6-10 • Leaning with Manual Mixture Control
Economy cruise, 80% power or less without flowmeter or EGT gage.
Carbureted Engines
Fuel Injected Engines
Slowly lean mixture control from "Full
Rich" position.
Slowly lean mixture control from
"Full Rich" position.
Lean until engine roughness is noted.
Continue leaning until slight loss of
power is noted and/or is
accompanied by roughness.
Enrich until engine runs smoothly.
Slight additional enrichment is
recommended to ensure adequate
performance.
Enrich until engine power is
regained and/or runs smoothly.
Slight additional enrichment is
recommended to ensure adequate
performance
Table 6-11 • Shut Down Procedure *
1. Set propeller governor control to "Low Pitch, High RPM" (when applicable).
2. Idle until there is a definite reduction in cylinder head temperature.
3. Move mixture control to "Idle Cut-Off".
4. When engine stops, turn off switches.
