Originally Posted by Joshboody
Octane rating is measured by a test engine. I thought heat of vaporization would be related to octane since a cooler mixture would result is less detonation combined with ignite temp. Anyway, just trying to gain a better understanding.
I'm sorry. I fixed my post. I realize now that my language was misleading. What I meant to say was that the octane rating and heat of vaporization are simply rated individually, not separate characteristics. A cooler mixture will definitely help combat premature ignition, but the two values are rated separately because they tell you different information about the given fuels characteristics. Detonation occurs from a combination of heat and pressure, not just heat.