Originally Posted By: bbhero
Yes knock resistance.... AKI... But what causes the knock???? Ignition too quickly right??? Or no?? What does octane really do??? Slow down or create resistance to ignition... Does that not have a relationship to how fast something ignites?? It does I think.. maybe. Most regular people think of volatility in terms of how easliy something or some substance can catch fire or blow up. Water is not as volatile as gasoline. But in your definition of volatility it would be the other way around. Which would be correct. Strange in a way but true if taken to a very technical level.
You see ................ War and Peace
Knock is the unwanted early spontaneous combustion of an air/fuel mixture (because of enough pressure present in the combustion chamber and way before the spark ignition point has been reached and triggered) once the inlet valve has been closed (volatility totally irrelevant at this stage because the mixture has already been prepared and its only sitting there waiting to be ignited and the resulting pressure/heat to be used)
Yes knock resistance.... AKI... But what causes the knock???? Ignition too quickly right??? Or no?? What does octane really do??? Slow down or create resistance to ignition... Does that not have a relationship to how fast something ignites?? It does I think.. maybe. Most regular people think of volatility in terms of how easliy something or some substance can catch fire or blow up. Water is not as volatile as gasoline. But in your definition of volatility it would be the other way around. Which would be correct. Strange in a way but true if taken to a very technical level.
You see ................ War and Peace
Knock is the unwanted early spontaneous combustion of an air/fuel mixture (because of enough pressure present in the combustion chamber and way before the spark ignition point has been reached and triggered) once the inlet valve has been closed (volatility totally irrelevant at this stage because the mixture has already been prepared and its only sitting there waiting to be ignited and the resulting pressure/heat to be used)