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Anyone here used 100 octane gas in their car? I have used 94 Ultra at Sunoco, but I wonder if using 100 octane would hurt the emissions or the cat. And does it help performance?
 

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you're safe up to 102 octane, after that it contains lead.
 

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You will actually lose power by running 100 octane in your engine. The reason for higher octane fuel is not to produce more power, but to guard against detonating. Lower octane fuel actually burns hotter and faster then higher octane fuel. If you do not have the compression to require that fuel, then you are using fuel that is not burning all the way and losing power/fuel economy.
 

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The benefit of increasing compression ratio is to increase the torque output of an engine. The harm in raising the compression ratio is that cylinder pressures increases in a linear fashion as compression ratio is increased. An 8:1 compression ratio yields compression pressures of about 275 psi, where 15:1 yields compression pressure of about 575 psi. At the time of ignition the pressures will rise 3 or 4 times the compression pressure. Also, when an engine has been modified where even a slight increase in torque is achieved it is important that detonation is not allowed. The noise of detonation of a high-compression ratio engine using the correct grade of fuel is much harder to detect than that of an engine with a much lower compression ratio burning lower octane fuels. 1 Thermal Efficiency -Thermal efficiency is the measure of the efficiency and completeness of combustion of the fuel, or, more specifically, the ratio of the output or work done by the working substance in the cylinder in a given time to the input or heat energy of the fuel supplied during the same time.
 
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