Quote:
Originally Posted by zforce
Octane rating is the amount of lubrication in the gas. The higher the octane rating the more lubiraction in the cumbustion chamber via the gasoline so the car can be tuned for more advanced from TDC, thus allowing the engine to run harder. the reason high compresion engines need higher octane is for the closer tolerance between parts. An old trick in making an engine run better at higher rpm was to advance the timing on an engine but the draw back was engine knocking and a hard engine to start so the trick was to adbance the timing enough to get good high rpm performance but still be able to start the car and avoid knocking when you turn the car off or at idling. The higher octane allowed us to advance the timing and not get knocking when the car was turned off. Now these days, the timing advancement is managed by the on board computer but the programming is dependant on the higher octane to protect the engine parts from knocking into each other.
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dear god i hope you are not serious.