Last Updated
：2025/11/21
spark knock
（ plural ）
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The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre
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spark knock
When the mechanic revved the engine, a sharp spark knock echoed through the test bay as the fuel-air mixture detonated before the piston reached top dead centre.
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When the mechanic revved the engine, a sharp spark knock echoed through the test bay as the fuel-air mixture detonated before the piston reached top dead centre.
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