Pelican's Perch #59:
Fried Valves

A cylinder in your piston aircraft engine flunks its compression check, with lots of leakage past the exhaust valve. The mechanic says you probably fried the valve by leaning too aggressively. Wrong, says AVweb's John Deakin! Lean mixtures don't cause burned valves lousy valve-to-seat geometry does. It's probably the fault of the factory or overhaul shop, not the pilot.

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