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· GS Hog
7,345 Posts
Engine knocking is caused by what is known as pre-ignition. This is primarily a characteristic of high compression engines.

When gasoline combusts in the cylinder prior to a spark (i.e. it combusts due to the compression instead of the spark), that is called pre-ignition.

That is why we use higher octane gas. The octane rating basically tells us how resistant to pre-ignition the fuel is. The higher the rating, the higher the resistance.
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