Gasoline

As usual you're totally wrong once again.

"Pinging" is only a vulgar form of addressing the technical word
"Detonation". I'm not surprised that you only knew the vulgar form, given
your poor education.

What really surprises me, and in all probability everyone in this newsgroup,
is how on earth you might ever have managed to be a petroleum chemist
without this knowledge. Then again you wrote "former". I guess that was just
a case history of redundancy? LOL

Pinging is just a poor attempt at simply describing the metallic noise the
engine makes when there are instances of detonation. Knocking is yet another
way of describing this.

Collins English Dictionary definition for "ping":

1.- a short high-pitched resonant sound, as of a bullet striking metal or a
sonar echo.

I suggest you read this, just in case you want to seek a new job in the
Petroleum Industry of the Uneducated:

http://www.answers.com/topic/engine-knocking

Engine knocking

Knocking (also called pinking or pinging)-technically detonation- in
internal combustion engines occurs when fuel in the cylinder is ignited by
the firing of the spark plug and smooth burning proceeds but some of the
unburned mixture in the combustion chamber explodes before the flame front
can reach it, combusting suddenly before the optimum moment of the
four-stroke cycle. The resulting shockwave collides with the rising piston,
creating a characteristic metallic "pinging" sound.

Anyway, why bother to answer any of your low posting again?

...
>
>
> JP Roberts wrote:
>>
>> The Octane number is just a measure of how easily the fuel will
>> self-ignite,
>
>
> Bzzzt.
>
> Octane number is measure of the fuel's resistance to *detonation.*
> Self-ignition is called "ping", and that's something different.
>
> Turbomotors should use the highest available octane fuel, due to
> effective compression ratio and charge temperature. 98 RON or better.
>
> E.P. (former petroleum chemist)
>