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Definition Of:

detonation

Engineering DictionaryDictionary of Automotive Terms
The action of the fuel charge firing or burning too violently, almost exploding. It sometimes results in a noise called "pinging ." Detonation is caused by autoignition of the "end gas " i.e., that part of the charge not yet consumed in the normal flame-front reaction. Detonation occurs because piston motion and compression of the end gas raise its temperature and pressure to the point where the end gas autoignites. The pinging or knocking noise is the result of intense pressure waves in the charge which cause the cylinder walls to vibrate. Also called "fuel knock."

 

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A
A Bone
A-2 tire
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A C CIRCUIT
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A F ratio
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