What is the difference between Detonation and Pre-ignition?

Q: What is the difference between Detonation and Pre-ignition?

Detonation is when the fuel/air mixture burns all at once in the cylinder as opposed to slowly starting from the spark plug. It can occur when the engine is running too hot, when running low octane fuel, or when running too high a manifold pressure for the RPM. The symptom are engine roughness, vibration, or loss of power. Pre-ingnition is when the fuel/air mixture is igniting before the spark plug sparks. This usually happens when small accumulations of lead or carbon build up on the piston head, or commonly, on the spark plug. These accumulations heat up and ignite the fuel/air mixture out of sequence, usually during the compression stroke. The symptoms are lack of power and engine roughness.

Spinning - Runup.ca

Detonation is when the fuel/air mixture burns all at once in the cylinder as opposed to slowly starting from the spark plug. It can occur when the engine is running too hot, when running low octane fuel, or when running too high a manifold pressure for the RPM. The symptom are engine roughness, vibration, or loss of power.

Pre-ingnition is when the fuel/air mixture is igniting before the spark plug sparks. This usually happens when small accumulations of lead or carbon build up on the piston head, or commonly, on the spark plug. These accumulations heat up and ignite the fuel/air mixture out of sequence, usually during the compression stroke. The symptoms are lack of power and engine roughness.

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Exercise 13 - Spinning Canada Pilot Toronto

Objective

To learn:

how to recognize conditions that lead to a spin and how to avoid them.
how to enter a spin.
how to recover from a spin.

Motivation

Spins can be scary for any pilot, and especially for the student pilot. The first time you enter a spin you will likely try to reach for the holy $&#% handles. Unfortunately, most airplanes do not have any. Spins can also be deadly if inadvertently entered with no knowledge of proper recovery techniques. Learning about the conditions that lead to a spin will hopefully ensure you never inadvertently enter one.

However, if you do happen to enter a spin inadvertently, proper recovery training will give you the best chance at not becoming a statistic. You will also be required to enter and recover from a spin on a flight test if you plan on becoming a Canadian commercial pilot. There is no spin requirement on Canadian private pilot flight tests.