Quote:
Originally Posted by BimmerAg
Octane is a measure of a fuel's resistance to autoignition, commonly known as knock. A higher octane means the fuel can withstand higher temperatures and pressures before knocking. This allows a custom tuner to advance the ignition timing to increase power. Running a tune designed for a lower octane rating means that the tune has been designed not to knock (for the most part) with the low octane, so a higher octane will be even less likely to cause knocking.
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This just really bugs me.
Autoignition is the temperature at which the fuel self ignites. This is how a diesel engine works.
Knock is unstable or unpredicted burn rate, much faster than expected. This is generally due to improper fuel to air mixture, not necessarily quantity or equivalency ratio, in combination to ignition advance.
They are separate conditions and should never be confused.
I challenge anyone to find reliable data about Gasoline Octane ratings and different autoignition temps. If you find them post them.
*hint, you'll have a hard time if you do good research