Knocking in SI Engine vs CI engine | Explain Differences in Knocking Phenomenon in SI and CI Engine

If you're curious about the differences between knocking in spark ignition (SI) engines and compression ignition (CI) engines, then you've come to the right place!

In this video, we'll explore the science behind engine knock and how it affects the performance and longevity of your engine. First, we'll define what engine knocking is and the various factors that contribute to it. Then, we'll dive into the differences between SI and CI engines and how they handle knock.

In SI engines, knocking occurs when the air-fuel mixture in the combustion chamber ignites prematurely, causing a shock wave that can damage the engine and reduce performance. This is commonly referred to as "pre-ignition" or "detonation" and is caused by a variety of factors, including poor fuel quality, high engine temperatures, and incorrect spark timing.

On the other hand, in CI engines, knocking occurs when the fuel mixture ignites too late, causing a "knocking" or "pinging" sound. This is due to the high compression ratio in CI engines, which causes the fuel to ignite spontaneously when it reaches a certain temperature and pressure. To prevent knock in CI engines, specialized fuels and injection systems are used to ensure proper ignition timing and temperature.

By understanding the differences between knock in SI and CI engines, you can take steps to prevent engine damage and maximize performance. So, whether you're a car enthusiast or just curious about the inner workings of engines, this video is for you!

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