Optimum flying interval for Lycoming engine longevity - per Google AI

[A2022]

Optimum flying interval for Lycoming engine longevity - per Google AI

To maximize the longevity of a Lycoming engine, the optimum flying interval is at least once per week for a duration of one hour or more. Regular flight is critical because piston engines are more likely to "rust out" from inactivity than "wear out" from use.

Core Flying Recommendations
• Minimum Frequency: Fly at least once every 7 days. This re-coats internal steel components with oil to prevent corrosion.
• Minimum Duration: Each flight should last at least 30 to 60 minutes.
• Target Oil Temperature: The primary goal of these flights is to reach an oil temperature of at least 165°F to 180°F. Sustaining this temperature for roughly 30 minutes allows moisture and acidic combustion byproducts to vaporize and vent from the crankcase.

Why Inactivity is Harmful
• Internal Corrosion: When an engine sits, oil drains off cylinder walls and cams. Moisture in the air then reacts with the exposed iron, creating rust and pitting on critical surfaces like lifters and camshafts.
• Ineffective Ground Runs: Lycoming strongly advises against simply "running the engine on the ground" to warm it up. Ground runs often fail to reach the necessary temperatures to evaporate water, potentially increasing acid accumulation and causing uneven cooling ("hot spots").

Maintenance Habits for Longevity
• Oil Change Intervals: If you cannot fly frequently enough to reach hourly limits (typically 50 hours with a filter), change the oil every 4 months regardless of flight time to remove accumulated acids.
• Consistent Utilization: Engines in high-use environments, such as flight schools, often reach or exceed their 2,000-hour Time Between Overhaul (TBO) more reliably than those that sit for weeks at a time.
• Corrosion Protection: If regular flight isn't possible (e.g., during winter), consider using an anti-corrosion oil additive like ASL Camguard or an engine dehydrator system.