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Corvette
C7 Forum
Octane Required
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<blockquote data-quote="EZERUSS" data-source="post: 100749" data-attributes="member: 2316"><p>There is a misconception about octane and why we use higher octane fuel in some instances. I think all performance engine guys will tell you that you want to run the lowest octane fuel you can run without detonation. A very broad statement but basically true.</p><p>The lower the octane the easier it will ignite and burn the problem is that in a high performance engine the burn will be slow and hot. So much heat that the engine will run poorly and not produce the power it was designed to.</p><p>If the engine is equipped with electronics to monitor the combustion the system will detect the detonation and retard the ignition timing and adjust the fuel delivery to try and eliminate the detonation and reduce the heat being produced by the poor burn.</p><p>Higher octane makes the fuel harder to ignite allowing the engine to create a hot fast burn at the top of the compression stroke creating the most power possible. Our engines control valve timing, ignition timing and fuel delivery, making the proper fuel very important. The manual says minimum 91. </p><p>We have done hundreds of fuel tests here in BC and the best fuels we have found are Chevron 94 and Shell Gold I believe it is 92.</p><p>Our tests showed these fuels are among the best anywhere on the continent. We have tested fuel from all over North America as part of technical inspection at races.</p><p>In my car I run 94 if I can get it or 91 If I cant get it and when in the USA I carry octane boost to add if I can't get good 91 without ethanol.</p><p>Ethanol is not ideal for our engines. It is basically an octane substitute.</p><p></p><p>Later....</p></blockquote><p></p>
[QUOTE="EZERUSS, post: 100749, member: 2316"] There is a misconception about octane and why we use higher octane fuel in some instances. I think all performance engine guys will tell you that you want to run the lowest octane fuel you can run without detonation. A very broad statement but basically true. The lower the octane the easier it will ignite and burn the problem is that in a high performance engine the burn will be slow and hot. So much heat that the engine will run poorly and not produce the power it was designed to. If the engine is equipped with electronics to monitor the combustion the system will detect the detonation and retard the ignition timing and adjust the fuel delivery to try and eliminate the detonation and reduce the heat being produced by the poor burn. Higher octane makes the fuel harder to ignite allowing the engine to create a hot fast burn at the top of the compression stroke creating the most power possible. Our engines control valve timing, ignition timing and fuel delivery, making the proper fuel very important. The manual says minimum 91. We have done hundreds of fuel tests here in BC and the best fuels we have found are Chevron 94 and Shell Gold I believe it is 92. Our tests showed these fuels are among the best anywhere on the continent. We have tested fuel from all over North America as part of technical inspection at races. In my car I run 94 if I can get it or 91 If I cant get it and when in the USA I carry octane boost to add if I can't get good 91 without ethanol. Ethanol is not ideal for our engines. It is basically an octane substitute. Later.... [/QUOTE]
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Corvette
C7 Forum
Octane Required
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