SPARK KNOCK Meaning and
Definition
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Spark knock, also known as engine knock or detonation, is a term used to describe an undesirable knocking or pinging sound produced by an internal combustion engine. It refers to the auditory effect resulting from the premature combustion of the air-fuel mixture inside the combustion chamber before the spark plug ignites it. This abnormal combustion can cause a knocking noise and can be detrimental to the engine's performance and longevity.
Spark knock occurs when the air-fuel mixture is ignited too early or at an improper timing, causing multiple flame fronts to collide and create shockwaves that produce the characteristic knocking sound. It can be caused by various factors, including an incorrect ignition timing, excessive combustion chamber temperatures, high engine load, poor fuel quality, or insufficient octane rating in the gasoline.
The consequences of spark knock can be severe, as it can lead to engine damage if left unresolved. The knocking sound itself is often an indication of inefficient fuel burn, reduced power output, and a potential decrease in fuel economy.
To prevent spark knock, engine manufacturers often specify a minimum octane rating for the fuel to be used. Higher octane fuels are less susceptible to premature combustion and can help prevent knocking. Additionally, monitoring and adjusting the engine's ignition timing, reducing engine load, and ensuring proper maintenance can also mitigate the occurrence of spark knock.
Overall, spark knock is an undesirable phenomenon in internal combustion engines that can affect performance, fuel efficiency, and engine longevity, necessitating proper diagnosis and preventive measures to ensure optimal engine operation.
Etymology of SPARK KNOCK
The term "spark knock" is derived from the combination of two words: "spark" and "knock".
The word "spark" comes from the Old English word "spearca", which means "a small particle of glowing matter". It is related to the Middle Low German word "sparke" and the Dutch word "sprank", both of which also mean "spark". The origin of the word can be traced back to the Proto-Germanic word "sparkōną".
The word "knock" originates from the Middle English word "knoken", which means "to strike". It can be traced back to the Old Norse word "knoka" and the Middle Dutch word "knoken".
The term "spark knock" specifically refers to the rattling or knocking sound produced in internal combustion engines when the air-fuel mixture in the combustion chamber detonates unevenly or prematurely.
