LYCOMING OPERATOR’S MANUAL SECTION 3
IO-320 SERIES OPERATING INSTRUCTIONS
(1) Maximum Power Cruise (approximately 75% power) – Never lean beyond 150°F on
rich side of peak EGT unless aircraft operator’s manual shows otherwise. Monitor
cylinder head temperatures.
(2) Best Economy Cruise (approximately 75% power and below) – Operate at peak
EGT, or if desired, drop 50°F on rich side of peak EGT.
2. LEANING TO FLOWMETER.
Lean to applicable fuel-flow tables or lean to indicator marked for correct fuel-flow for
each power setting.
3. LEANING WITH MANUAL MIXTURE CONTROL (Economy Cruise, 75% power or less)
without flowmeter or EGT gage.
a. Fuel Injected Engines.
(1) Slowly move mixture control from “Full Rich” position toward lean position.
(2) Continue leaning until slight loss of power is noted (loss of power may or may not be
accomplished by roughness).
(3) Enrich until engine runs smoothly and power is regained.
As shown in Figure 3-1, if engine speed and throttle setting are kept constant at normal cruise conditions,
the affect of leaning on engine power and engine temperatures will be as shown. Power drops rapidly when
the engine is leaned beyond peak exhaust gas temperature; also, best power is attained on the rich side of
peak exhaust gas temperature.
8. ENGINE FLIGHT CHART.
Model Aviation Grade Fuel
IO-320-A1A, -A2A, -E1A, -E2A, -E1B, -E2B 80/87 octane, minimum
IO-320-B1A, -B2A, -B2B, -B2C, -B1D 91/96 or 100/130 octane, minimum
IO-320-D1A, -D1B 91/96 or 100/130 octane, minimum
IO-320-B1E, -C1A, -C1B, -D1C 100/100LL octane, minimum
AIO-320 Series 91/96 or 100/130 octane, minimum
LIO-320-B Series 91/96 or 100/130 octane, minimum
LIO-320-C Series 100/130 octane, minimum
NOTE: Aviation grade 100LL fuels in which the lead content is limited to 2 c.c. per gal. are approved for
continuous use in the above listed engines.
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