Readers ask: Detonation Occurs In A Reciprocating Aircraft Engine When?

What is detonation in an aircraft reciprocating engine?

Administration. Detonation. DetonationDetonation, as the name suggests, is an explosion of the fuel-air mixture inside the cylinder. It occurs after the compression stroke near or after top dead center. During detonation, the fuel/air charge (or pockets within the charge) explodes rather than burning smoothly.

What causes engine detonation?

Detonation, or engine knock, occurs simply when fuel pre-ignites before the piston reaches scheduled spark ignition. Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these.

What causes detonation aviation?

Causes of detonation are limited to excessive heat and low octane. Excessive heat can come from improper cooling, high compression from excessive combustion chamber deposits, lean mixture, advanced timing and more. When it is limited to one cylinder the very likely culprit is a partially clogged fuel injector.

What is detonation in SI engine?

Detonation is spontaneous combustion inside the cylinder AFTER the spark plug fires. This causes a brief, but intense, spike in cylinder pressure. Detonation is also called an “Engine Knock”, “Knocking“, or “Pinging” because of the sound it makes.

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How do you prevent engine detonation?

Detonation Elimination: 9 Ways to Prevent Engine Detonation

  1. #1. Up Your Octane.
  2. #2. Keep Compression Reasonable.
  3. #3. Check Your Timing.
  4. #5. Monitor the Mixture.
  5. #6. Blow out the Carbon.
  6. #7. Examine Your Knock Sensor.
  7. #8. Read Your Spark Plugs.
  8. #9. Consider Your Cooling System.

What are the effects of detonation?

Detonation has negative effects throughout the engine. Light detonation may cause premature wear on bearings and bushings. Severe or prolonged detonation can cause damage to the cylinder head and pistons.

How is detonation diagnosed?

Optimize the Air/Fuel Ratio

The result is a hot-running engine that will quickly build heat, and that can cause detonation. The best way to diagnose detonation in this situation is to install a wide-band oxygen sensor and monitor it during periods of high engine load.

What is difference between detonation and knocking?

Detonation is an uncontrolled combustion event which occurs after the spark event. Pre-ignition is an uncontrolled combustion event which occurs before the spark event. Knock (pinging) is the actual noise that can be audibly heard if detonation is bad enough.

Can bad spark plugs cause detonation?

The wrong spark plugs can cause detonation.

Spark plugs with the wrong heat range (too hot) can cause detonation as well as preignition. Copper core spark plugs have a broader heat range than ordinary spark plugs, which lessens the danger of detonation.

What detonation sounds like?

detonation is refered to as “popcorn” or “bacon” noise, wich it sounds like frying bacon in the pan. It also can be described as somone taking a small ball peen hammer and tapping it on the side of the block.

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What is the meaning of detonation?

1: the action or process of detonating. 2: rapid combustion in an internal combustion engine that results in knocking.

What is the critical altitude?

Critical altitude is the maximum altitude where the engine turbochargers (or turbonormalizers) can maintain sea level standard pressure to the engines. Above the critical altitude the engines will produce less power, although still delivering more power than an normally aspirated engine at the same air density.

Is pinging bad for engine?

Pinging” is indeed very bad and can permanently damage the internals of the engine.

What is knocking in fuel?

Knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. These pressure waves force parts of the engine to vibrate, which produces an audible knock.

What is ignition lag?

[ig′nish·ən ‚lag] (mechanical engineering) In the internal combustion engine, the time interval between the passage of the spark and the inflammation of the air-fuel mixture. Also known as ignition delay.

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