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Discussion Starter · #1 ·
One of my friends was talking about it and lunch and I didnt know what it was. Could someone tell me what exactly it is? I hate not knowing something about cars around my friends. Thanks. :)
 

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GS Hog
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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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