ORIGINAL: Anthoop
ORIGINAL: proanti
ORIGINAL: Anthoop
Higher octane fuel allows more advanced ignition timing...if you have a lower octane fuel than normal then you will need to retard the ign timing to prevent pinking.
It's purely about compression, not timing. The pinging is the fuel igniting under compression.
Cmon. If I have change to a lower octane fuel and the engine pinks then retarding the ignition will prevent pinking.
ORIGINAL: Mister Sinister
Pinging is the air/fuel mixture igniting OUTSIDE of the flame front, meaning not where/when optimum combustion happens in the cylinder. It's typically caused by a hot spot in the cylinder, which can often be caused by too much timing advance.
It sounds as though you are confusing pinking with pre-ignition?
Pinging
is preignition. It's the fuel igniting before the plug fires. It rarely has to do with timing, as you would have to advance 10s of degrees for it to happen, and a car doesn't come that far out of time on its own.
C'mon, everyone knows this.