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Posts Tagged: Pre-ignition versus detonation

Pre-ignition versus detonation (knock)

Pre-ignition versus detonation (knock) — what’s the difference? Many car “experts” use the terms pre-ignition and detonation interchangeably or blame pre-ignition on low octane fuel. Let’s set the record straight; pre-ignition and detonation are not the same, they occur in different phases of the four-stroke process and only one is caused by using low octane fuel. What is pre-ignition? Pre-ignition is defined as starting the combustion process BEFORE the spark plug fires. It occurs during the compression stroke. Pre-ignition is caused when a hot object/area in the combustion chamber ignites … Read More


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