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Aircraft systems and instrumentsQuestion 631 of 934

What can result from operating the engine at higher than its designed temperature?

  1. Better fuel economy and longer engine life
  2. A lower oil temperature and less friction
  3. Higher manifold pressure at the same throttle setting
  4. Loss of power, oil consumption, and detonation
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Correct answer: Loss of power, oil consumption, and detonation

It can also cause serious permanent damage, such as scoring the cylinder walls and warping the valves.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Engine Cooling Systems, page 177

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026