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SVTPerformance's Chain of Restaurants
Road Side Pub
Octane levels result in different levels of performance on a stock
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<blockquote data-quote="wundrbird" data-source="post: 14091406" data-attributes="member: 18025"><p>Everything below is based on what I've read in the past. Your mileage may vary:</p><p></p><p>I think that a car has to be able to sense octane changes with advanced knock sensors, as mentioned previously, to get any benefit by advancing timing. I know that my truck actually runs worse on octanes higher than 87. It will kick, buck, and sputter and the power is noticeably less. Lower octane fuels have more BTU's per gallon due to the fact that the additives in higher octane fuels actually lower total energy. The benefit, however, is that you can pump more 93 octane than 87 in a cylinder to make up for it's lack of energy due to its knock resistance.</p><p></p><p>And octane is an 8 carbon chain organic compound that is sometimes found in trace amounts in gasoline. Gasoline in its many different forms is compared to pure octane in its knock resistance. Pure octane (the chemical) is considered to be 100 octane (the rating of knock resistance). 93 octane fuel has 93% of the knock resistance of the pure chemical. Race fuels over 100 octane have more than 100%. Even race fuels have less total BTU's by volume than regular gasoline, but the knock resistance is so high that you can pump a LOT more fuel into the engine.</p><p></p><p>There are two ways to measure octane. There's an "R" method and an "M" method. (You can Google them for what they represent.) An average is taken and posted as the official octane rating. That's why you see (R+M)/2 on gas pumps.</p></blockquote><p></p>
[QUOTE="wundrbird, post: 14091406, member: 18025"] Everything below is based on what I've read in the past. Your mileage may vary: I think that a car has to be able to sense octane changes with advanced knock sensors, as mentioned previously, to get any benefit by advancing timing. I know that my truck actually runs worse on octanes higher than 87. It will kick, buck, and sputter and the power is noticeably less. Lower octane fuels have more BTU's per gallon due to the fact that the additives in higher octane fuels actually lower total energy. The benefit, however, is that you can pump more 93 octane than 87 in a cylinder to make up for it's lack of energy due to its knock resistance. And octane is an 8 carbon chain organic compound that is sometimes found in trace amounts in gasoline. Gasoline in its many different forms is compared to pure octane in its knock resistance. Pure octane (the chemical) is considered to be 100 octane (the rating of knock resistance). 93 octane fuel has 93% of the knock resistance of the pure chemical. Race fuels over 100 octane have more than 100%. Even race fuels have less total BTU's by volume than regular gasoline, but the knock resistance is so high that you can pump a LOT more fuel into the engine. There are two ways to measure octane. There's an "R" method and an "M" method. (You can Google them for what they represent.) An average is taken and posted as the official octane rating. That's why you see (R+M)/2 on gas pumps. [/QUOTE]
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SVTPerformance's Chain of Restaurants
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Octane levels result in different levels of performance on a stock
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