Posted by Owen Aaland on July 24, 2010 at 22:32:26 from (198.70.47.148):
In Reply to: gasoline octane.. posted by railhead on July 24, 2010 at 12:15:57:
pete 23 said: (quoted from post at 00:51:17 07/25/10) Octane of gasoline is like progression in smokeless gun powder. The higher the octane or more progressive the powder is the slower it burns. Higher compression causes fuel to burn faster so we slow it down to arrive at the same approximate time frame of combustion as a lower compression engine with lower octane . Gun powder, the heavier the load, higher pressure so we slow it to control it. Very similar situation.
That is the most concise explanation of why we use different octanes that I've seen on this board.
The "time frame" is basically 10 degrees ATDC. No matter what fuel is being used or what the engine speed is, combustion should be complete by about 10 degrees ATDC. Ignition timing is changed to achieve that goal.
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