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<blockquote data-quote="Snake Eyes" data-source="post: 1824953" data-attributes="member: 3410"><p>Octane (in the sense of a measurement rather than a chemical) isn't the measure of how easy you can ignite a fuel, but rather how much heat a fuel can handle before igniting spontaneously (and coincidently a linear relationship with how quickly it burns). The octane rating is dictated by (for the most part) by the compression ration of the engine and timing is dictated by the burn rate of the fuel. Now heat in the combustion chamber is a byproduct of many things like, compression ratio, air fuel mixture, and air temp.</p><p></p><p>Compression ratio generates heat because when you compress a gas (air) the molecules are packed closer together causing them to collide more often and this generates friction heat.</p><p></p><p>Air fuel mixture affects heat because when the fuel is injected in to the intake charge, it cools the incoming air because the warm air gives some of it's heat to the fuel. Fuel like alcohol always seems cold, this is because of its very low evaporation temperature (and a small amount will evaporate and become vapor before compression).</p><p></p><p>Air temp is obviously important which is why we buy CAIs. The colder the air is the denser it is, the more we can pull in to the cylinders.</p><p></p><p>The PCV adversely affects your engine in the following ways. </p><p>The hot air from the PCV heats up the intake charge (incoming air). The engine measured the air temp and now that measurement is off.</p><p></p><p>The oil mist collides with the misted fuel and causes some of it to burn slowly or to not ignite at all. This will cause the engine to run leaner.</p><p></p><p>And while oil is fairly stable it still burns under the extreme heat of combustion and I certainly don't know what it's octane is but I would assume it is very low and has a fast burn time.</p><p>This causes two problems, 1 if it ignites before the fuel is supposed to ignite it could cause the fuel to ignite prematurely (detonation). 2 if it burns fast it will cause the fuel to burn unevenly thus lowering the efficiency of the motor.</p><p></p><p>Note: Gas = Air, Fuel = Gasoline.</p><p></p><p>This may help. <a href="http://science.howstuffworks.com/gasoline1.htm" target="_blank">http://science.howstuffworks.com/gasoline1.htm</a></p></blockquote><p></p>
[QUOTE="Snake Eyes, post: 1824953, member: 3410"] Octane (in the sense of a measurement rather than a chemical) isn't the measure of how easy you can ignite a fuel, but rather how much heat a fuel can handle before igniting spontaneously (and coincidently a linear relationship with how quickly it burns). The octane rating is dictated by (for the most part) by the compression ration of the engine and timing is dictated by the burn rate of the fuel. Now heat in the combustion chamber is a byproduct of many things like, compression ratio, air fuel mixture, and air temp. Compression ratio generates heat because when you compress a gas (air) the molecules are packed closer together causing them to collide more often and this generates friction heat. Air fuel mixture affects heat because when the fuel is injected in to the intake charge, it cools the incoming air because the warm air gives some of it's heat to the fuel. Fuel like alcohol always seems cold, this is because of its very low evaporation temperature (and a small amount will evaporate and become vapor before compression). Air temp is obviously important which is why we buy CAIs. The colder the air is the denser it is, the more we can pull in to the cylinders. The PCV adversely affects your engine in the following ways. The hot air from the PCV heats up the intake charge (incoming air). The engine measured the air temp and now that measurement is off. The oil mist collides with the misted fuel and causes some of it to burn slowly or to not ignite at all. This will cause the engine to run leaner. And while oil is fairly stable it still burns under the extreme heat of combustion and I certainly don't know what it's octane is but I would assume it is very low and has a fast burn time. This causes two problems, 1 if it ignites before the fuel is supposed to ignite it could cause the fuel to ignite prematurely (detonation). 2 if it burns fast it will cause the fuel to burn unevenly thus lowering the efficiency of the motor. Note: Gas = Air, Fuel = Gasoline. This may help. [url]http://science.howstuffworks.com/gasoline1.htm[/url] [/QUOTE]
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