Detonation vs pre ignition

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"Pre-ignition" is an abnormal combustion event. Pre-ignition is the ignition of the air- fuel charge while the piston is still compressing the charge. ... Detonation - Detonation, as the name suggests, is an explosion of the fuel-air mixture inside the cylinder.


What causes detonation and pre-ignition?
Hot spots from detonation, improper heat range spark plugs and glowing carbon deposits from lean mixtures are common causes of pre-ignition.

What damage can pre-ignition cause?
Preignition creates excessive heat and substantial damage to the pistons, bearings, spark plugs and cylinders. Preignition is not easily detectable as it does not make an audible noise when it occurs. An engine experiencing Preignition will exhibit a lack of power and will run rough.

Is pre-ignition bad?
Pre-ignition (self-ignition) occurs when the fuel mixture in the cylinder burns before the spark-ignition event at the spark plug. Pre-ignition may or may not cause permanent engine damage, but it does lead to engine inefficiencies and may cause engine damage if it is a severe or continuous event.

What is difference between detonation and knocking?
Knocking is the making sharp sounds due to uneven combustion of fuel in the cylinder of a vehicle engine. Detonation is the process of pre-ignition or auto-ignition of a fuel in an engine's combustion chamber

How do you fix pre-ignition problems?
There are several ways to cure pre-ignition:
Run higher octane fuel. Premium gas rated at 92 or 94 octane is best for an engine with a compression ratio between 9.25 and 10.25:1. ...
Run the engine on the rich side. ...
Try playing with ignition timing.



Why does pre-ignition occur?
Pre-ignition occurs when the local temper- ature of components in the combustion chamber exceeds the flash point of the in- jected fuel. The most important compo- nents and regions which should be considered are the spark-plugs, the exhaust valve, the piston head and the quenching edges in the cylinder head.


How pre-ignition can be occur?
Pre-ignition is initiated by an ignition source other than the spark, such as hot spots in the combustion chamber, a spark plug that runs too hot for the application, or carbonaceous deposits in the combustion chamber heated to incandescence by previous engine combustion events.

Does pre-ignition cause detonation?
Detonation: 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. ... Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition

What are two terms for engine knocking?
Knocking (also knock, detonation, spark knock, pinging or pinking) in spark ignition internal combustion engines occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode ...

Can bad spark plugs cause detonation?
The wrong spark plugs can cause detonation.

Spark plugs with the wrong heat range (too hot) can cause detonation as well as preignition.