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Corvette
Corvette Performance
Octane level
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<blockquote data-quote="Riley P" data-source="post: 15233" data-attributes="member: 2"><p>I run 91 from Esso. No issues there. The car would run fine on 87 but obviously power would suffer a bit as the engine has to retard the ignition a bit if I go full throttle and it senses detonation. </p><p></p><p>Everyone should note that octane rating is NOT an indication of how much power the fuel has. All gasoline has the same "power" or energy per liter. The reason why you run higher octane fuel is that octane is a measurement of the fuels resistance to detonation. High performance engines with higher compression ratios or boost squeeze the fuel more than a lower compression engine and therefore create more heat in the combustion chamber before the fuel is ignited by the spark. That is why you need a higher octane fuel so that the fuel does not ignite before the spark plug fires. That is what knock is and new engines adjust the timing if this occurs but power is then reduced.</p><p></p><p>Side note, I realize ethanol has less energy per liter than gasoline (approx 80%) and that premium normally does not contain ethanol. However! E85 (85% ethanol) has an octane rating of 100-105. This allows higher compression ratios or the ability to run higher boost than when running pure gasoline. More fuel and more air = more power.</p><p></p><p>On a side note, each oil company adds it's own additives to the fuels they sell. This has nothing to do with what I wrote above.</p></blockquote><p></p>
[QUOTE="Riley P, post: 15233, member: 2"] I run 91 from Esso. No issues there. The car would run fine on 87 but obviously power would suffer a bit as the engine has to retard the ignition a bit if I go full throttle and it senses detonation. Everyone should note that octane rating is NOT an indication of how much power the fuel has. All gasoline has the same "power" or energy per liter. The reason why you run higher octane fuel is that octane is a measurement of the fuels resistance to detonation. High performance engines with higher compression ratios or boost squeeze the fuel more than a lower compression engine and therefore create more heat in the combustion chamber before the fuel is ignited by the spark. That is why you need a higher octane fuel so that the fuel does not ignite before the spark plug fires. That is what knock is and new engines adjust the timing if this occurs but power is then reduced. Side note, I realize ethanol has less energy per liter than gasoline (approx 80%) and that premium normally does not contain ethanol. However! E85 (85% ethanol) has an octane rating of 100-105. This allows higher compression ratios or the ability to run higher boost than when running pure gasoline. More fuel and more air = more power. On a side note, each oil company adds it's own additives to the fuels they sell. This has nothing to do with what I wrote above. [/QUOTE]
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Corvette
Corvette Performance
Octane level
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