Isooctane is assigned an octane number of 100. The octane number is determined by comparing the characteristics of a gasoline to isooctane (2,2,4-trimethylpentane) and heptane. The octane number of gasoline is a measure of its resistance to knock. This creates engine knock, a characteristic rattling or pinging sound in one or more cylinders. In internal combustion engines, the compressed gasoline-air mixtures have a tendency to ignite prematurely rather than burning smoothly. You may wish to experiment to see if you can use a grade lower fuel without creating engine ping, in order to be optimally cost efficient. Consult the appropriate engine manual or vehicle owner's manual for the suggested minimum octane rating. This method of calculation is good for all internal combustion engines, including automotive or general aviation. You may however, change the values appropriately. We have inserted potential defaults that are correct for the most popular octane rating of 87. To calculate simply enter the Research octane Number (RON) and the Motor octane Number (MON) click on Calculate and the minimum octane number, what you see at the pump, is returned. A gasoline with an octane number of 92 has the same knock as a mixture of 92% isooctane and 8% heptane. Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock). Octane rating number is defined as a value used to indicate the resistance of a motor fuel to knock. This calculator determines the minimum octane rating, also know as the knock index, by the formula (R+M)/2. Octane Information Calculator Octane Calculator Octane Calculator
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