I wanted to know that what exactly is Knocking in an engine cylinder.

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SUMMARY

Engine knocking, also known as detonation, is a significant fault in engine cylinders that can severely impact engine longevity. It occurs primarily due to excessively advanced ignition timing, but can also result from mechanical faults, high boost pressure, elevated charge air temperatures, and improper air-fuel ratios. Fuel quality, particularly its knock resistance, plays a crucial role in this phenomenon. Understanding these factors is essential for maintaining optimal engine performance and preventing catastrophic failures.

PREREQUISITES
  • Understanding of ignition timing and its effects on engine performance
  • Knowledge of air-fuel ratio and its impact on combustion
  • Familiarity with engine components and mechanical faults
  • Awareness of fuel properties, particularly knock resistance
NEXT STEPS
  • Research advanced ignition timing and its effects on engine performance
  • Learn about air-fuel ratio optimization techniques
  • Explore the relationship between boost pressure and engine knocking
  • Investigate fuel types and their knock resistance properties
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Automotive engineers, mechanics, and performance enthusiasts looking to enhance engine reliability and performance by understanding the causes and prevention of engine knocking.

cyborgyash
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I wanted to know that what exactly is Knocking in an engine cylinder. I know it's a kind of a fault. But how and whole process leading to it is, what i want to know.
Any reply will be well appreciated.

:D
Yash
 
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Thanks !
But, i was looking forward for some users self explained answer.
 


it is DETONATION...big time problem and not good for the life of the engine.It is caused by ignition timing being advanced too much, over heating which causes vapor lock..i blew up aqn engine once when towing the race car trailer due to this.
 


The Wikipedia article sums it up very well, I'm not sure why you need anyone here to type out the same information. Read it, digest it, and if you still have questions come back and you'll get the help you need.

It's not only caused by advanced ignition timing, but can be caused by a mechanical fault, high boost pressure, high charge air temperature, low/high air fuel ratio (depending on fuel type), fuel with inadequate knock resistance and a few other factors. It's also normally the primary limitation on the rating of a spark ignition engine.
 

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