Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug.
Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing
Detonation involves a supersonic exothermic. Knocking in a engine is spark-ignition internal combustion.
both are the same thing..............
Knocking is a rattling noise caused by abnormal combustion in the engine, typically due to improper fuel octane or ignition timing. Detonation is a more severe form of knocking where the air-fuel mixture explodes rather than burns, leading to increased pressure and temperature that can damage the engine. Both can be harmful to the engine and should be addressed promptly.
It is there to detect detonation or ( knocking ) and the information is used to adjust timing by the pcm.
Yes, detonation can be caused by low octane fuel. Octane rating measures a fuel's resistance to knocking or detonation, which occurs when fuel-air mixtures ignite prematurely in the engine. Using fuel with a lower octane rating than what the engine is designed for can lead to increased engine temperatures and pressures, resulting in knocking and potential engine damage. To prevent detonation, it's important to use fuel that meets the manufacturer's recommended octane rating.
Knocking due to detonation in the cylinders, poor fuel mileage, reduced lifespan.
When an engine runs as it should the fuel/air mix in the combustion chamber ignites at the spark plug and the flame front spreads from there. In an engine that's knocking there are hotspots in the combustion chamber causing the fuel/air mixture to ignite prematurely a bit all over the place.
The "knocking property" of fuel refers to its tendency to cause engine knocking or detonation, which is an undesirable phenomenon in internal combustion engines. Knocking occurs when the air-fuel mixture ignites prematurely before the spark plug fires, leading to a sudden rise in pressure that can damage the engine. This property is often measured using octane rating; higher octane fuels are less prone to knocking, making them more suitable for high-performance engines. Proper fuel selection is crucial for optimal engine performance and longevity.
low order detonationlow order detonation
An incomplete detonation is referred to as a "deflagration," while a complete detonation at a lower than maximum velocity is known as a "low-order detonation."
low order detonationlow order detonation
low order detonationlow order detonation