Detonation Vs. Pre-Ignition

[Accord2nrz]

What are they and how do they differ?

Can you tell which one you are experiencing just by listening?

What are some general causes and cures for each.

[akinat90]

What are they and how do they differ?

Can you tell which one you are experiencing just by listening?

What are some general causes and cures for each.

I found this website http://www.hrd-performance.com/13.html it's a little long but have the deatails. I was going to take out the part i thought was pertinent but all is. So forgive me

[Dzaster]

From that article above, linked by akinat90 :

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. The initial combustion at the spark plug is followed by a normal combustion burn. For some reason, likely heat and pressure, the end gas in the chamber spontaneously combusts. The key point here is that detonation occurs after you have initiated the normal combustion with the spark plug.

Pre-ignition
Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. The two are completely different and abnormal phenomenon.

Learned something new.:rolleyes:

[TXTuner]

Man, I always thought they were the same thing.

[Accord2nrz]

Noperz but both have the same type of devastating effect on the motor. I've personally seen detonation. it sucks.

[phantomneo]

so simply said that detonation is the afterwards of normal combustion and pre ignition is before..i used to own a carburetted car where the ignition timing is set by using the timing light..set it to advance 12 deg and it would pre ignite under hi load trotel...but when i retard the ignition to make the pinging noise disappear, so does the power huhu