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Engine 'knocking'

Question : CARS running on RON97 petrol may encounter "knocking" of the engine when changed to RON92.

What is meant by "knocking"?

Answer : You probably have read this elsewhere but basically, anti-knock additives actually slow down the burning of the air-fuel mixture in the engine.

When the compression ratio gets too high or the fuel does not have sufficient anti-knock additives, the air-fuel mixture will detonate (explode) instead of burning, resulting in a "pinging" or "knocking" noise coming from the engine.

When this happens, there is a very high pressure rise in the cylinder and if it is allowed to continue, you could have piston and piston ring failure.

 
 

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