Scribd
Upload
117 views4 pages

Engine Detonation Warning

Detonation is a spontaneous combustion of the remaining fuel-air mixture that occurs after normal combustion. It causes a very high pressure spike in the cylinder that results in engine components resonating like they were struck by a hammer, creating the noise known as spark knock. Detonation can lead to loss of power, increased engine temperature, smoking, and damage to engine components over time such as broken piston rings, scored cylinder walls, and eroded pistons if left unaddressed. Failure of an engine due to detonation is not covered under warranty.

Uploaded by

dromaki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
117 views4 pages

Engine Detonation Warning

Detonation is a spontaneous combustion of the remaining fuel-air mixture that occurs after normal combustion. It causes a very high pressure spike in the cylinder that results in engine components resonating like they were struck by a hammer, creating the noise known as spark knock. Detonation can lead to loss of power, increased engine temperature, smoking, and damage to engine components over time such as broken piston rings, scored cylinder walls, and eroded pistons if left unaddressed. Failure of an engine due to detonation is not covered under warranty.

Uploaded by

dromaki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 4

Detonation Information

IMPORTANT INFORMATION ON DETONATION


Detonation is a phenomenon that can occur in any gasoline engine. It is distinctly different from Preignition.
Detonation is caused by incorrect or excessive engine timing, engine temperature, cylinder pressure, fuel
mixture temperature or fuel octane rating.
Detonation is defined as a spontaneous combustion of the remaining fuel air mixture occurring after normal
combustion occurs. When Detonation occurs, it causes a very high, very sharp pressure spike in the cylinder.
That pressure spike results in the components of the engine resonating as if they were struck by a hammer.
This noise of detonation is commonly known as spark knock and is not always audible under normal driving
conditions. (The main reason for knock sensors).
What will be noticeable is the loss of power, increased engine operating temperature and in some cases,
smoking.
Please review the following photos that illustrate the results of detonation on a gasoline engine.
Failure of an engine from the effects of detonation is not covered under the RMP warranty.

Pistons with broken ring lands are one of the first effects of Detonation

Detonation Information

Another effect is scored cylinder walls from piston skirt contact

Detonation Information

The underside of the piston crown is heavily discolored with coked oil due to excessive heat
being transferred.

Detonation Information

Piston Crown Erosion

Broken Compression Rings

Broken Ring Lands

Piston Skirt Scuffing

This photo shows the final results of detonation, if the root cause is not
corrected.

TN2 12/2014

You might also like