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Which engine setting combination can cause damaging detonation?

High manifold pressure with low rpm.

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  1. Low manifold pressure and high rpm
  2. Idle power and rich mixture
  3. High manifold pressure and low rpm ✔

Why: Too much manifold pressure raises combustion pressures and engine temperatures, which stresses the engine. Paired with low rpm, it can trigger detonation, an explosive burn instead of a smooth one.

Huh, didn't know that: Detonation is an uncontrolled, explosive ignition of the fuel-air mixture.

The dad joke
Why did the cylinder get detonation? It could not keep its temper under pressure.
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References

Answer: High manifold pressure and low rpm. Too much manifold pressure raises combustion pressures and engine temperatures, which stresses the engine. Paired with low rpm, it can trigger detonation, an explosive burn instead of a smooth one.

  1. Airplane Flying Handbook ch 12, Transition to Complex Airplanes (FAA-H-8083-3C) www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/13_afh_ch12.pdf
    A combination of high manifold pressure and low rpm can induce damaging detonation
    Checked 2026-10-11.
  2. Airplane Flying Handbook ch 12, Transition to Complex Airplanes (FAA-H-8083-3C) www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/13_afh_ch12.pdf
    Excessive manifold pressure raises the cylinder combustion pressures, resulting in high stresses within the engine
    Checked 2026-10-11.

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