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The Terminator
Terminator Talk
Does Higher Octane Fuel Burn Cooler?
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<blockquote data-quote="Smokin04" data-source="post: 8257832" data-attributes="member: 25962"><p>The higher the octane, the harder it is for the fuel to ignite. The <strong>only</strong> time you will see a cylinder temp. drop is when you run a richer mixture or have a better than stock cooling system. In general terms...the more fuel you put in it, the cooler it runs, NOT the more OCTANE. The stoich level of race fuel is also a little different though. NA (naturally aspirated) stoich levels of say 110 octane is around 13.7 (depending on brand) instead of the industry typical 14.7 for 93 pump. So it can be confused with running cooler because the race fuel inherently burns at a richer (cooler) level than pump gas with no computer changes. FI (forced induction) cars have to run richer to keep detonation at bay at higher pressures. Pressure creates heat, heat adds to "hot spots" which if left unchecked, can turn red hot. That will cause pre-ignition (much more destructive than detonation).</p><p></p><p>N20 is a cool air charge, but does increase cylinder pressure. It <strong>chemically</strong> introduces more O2 molecules where as blowers and turbos do it <strong>mechanically</strong>. Again, more pressure = more heat...but ALL N20 applications require additional FUEL to burn right. If not you're just introducing additional oxygen without additional fuel which will lean your mixture. The leaner the A/F...the hotter the chambers are. Also why running colder spark plugs helps ward off detonation.</p></blockquote><p></p>
[QUOTE="Smokin04, post: 8257832, member: 25962"] The higher the octane, the harder it is for the fuel to ignite. The [B]only[/B] time you will see a cylinder temp. drop is when you run a richer mixture or have a better than stock cooling system. In general terms...the more fuel you put in it, the cooler it runs, NOT the more OCTANE. The stoich level of race fuel is also a little different though. NA (naturally aspirated) stoich levels of say 110 octane is around 13.7 (depending on brand) instead of the industry typical 14.7 for 93 pump. So it can be confused with running cooler because the race fuel inherently burns at a richer (cooler) level than pump gas with no computer changes. FI (forced induction) cars have to run richer to keep detonation at bay at higher pressures. Pressure creates heat, heat adds to "hot spots" which if left unchecked, can turn red hot. That will cause pre-ignition (much more destructive than detonation). N20 is a cool air charge, but does increase cylinder pressure. It [B]chemically[/B] introduces more O2 molecules where as blowers and turbos do it [B]mechanically[/B]. Again, more pressure = more heat...but ALL N20 applications require additional FUEL to burn right. If not you're just introducing additional oxygen without additional fuel which will lean your mixture. The leaner the A/F...the hotter the chambers are. Also why running colder spark plugs helps ward off detonation. [/QUOTE]
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Does Higher Octane Fuel Burn Cooler?
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