Question: How Do You Know If You Have Detonation?

How do you check for detonation in an engine?

Moderate to severe detonation could be noticed as engine roughness, vibration or loss of power and eventually engine damage.

A pilot should always be looking for unexpectedly high Cylinder Head Temperatures (CHTs) or Exhaust Gas Temperatures (EGTs) which may be a sign that detonation is occurring..

What does detonation feel like?

When detonation happens, some of the air/fuel ignites before the normal burn can get to it. 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.

What can cause engine detonation?

Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these. Of the previous, excessive heat is usually the culprit. As an engine is modified to generate more power, additional heat is produced.

What is the difference between detonation and preignition?

Detonation: Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug. … Pre-ignition: Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing.

What does detonation look like on a spark plug?

With the early signs of detonation, the shock-wave will also rattle rings causing the tiny amounts of oil that now gets by rings, to be fused to the white porcelain as tiny black specks, also fused as specks are soot that was clinging to clearance volume surfaces in the relatively “still-air” of the boundary layer.

How do you fix detonation?

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