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What is detonating?

Updated: 9/6/2022
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Wiki User

9y ago

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Detonation, knocking, or pinging in a gasoline engine is caused by an improper burn in the engine cylinders. As the spark plug fires and the fuel begins to burn detonation has the fuel also starting to burn in another location within the cylinder. When the two flame fronts come together it causes the characteristic "pinging" noise like marbles in a coffee can. It happens very quickly.

This process can cause engine damage to the engine by the pressure created where the flame fronts meet. Most modern cars use a "knock sensor" that automatically retards ignition timing in response to the knocking sound. retarding the timing stops the knock but reduces fuel mileage slightly.

This is the one benefit to using premium gasoline, which is formulated specifically to help stop this problem. Otherwise regular gasoline is the same.

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Pearline Blick

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1y ago
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