Gyrobob
Serious Thumper
Offline
Posers ain't motorcyclists
Posts: 2571
Newnan, GA
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Premium doesn't burn any slower than regular. This is an old wives' tales spread by the likes of wikianswers, cha cha, ask Jeeves, yahoo answers, most auto and cycle and boat forums, etc.
Premium is less susceptible to detonation because of octane additives,.. it has nothing to do with burn rate.
For one thing the burn rate of all the fuels available to Savage riders is for all practical purposes, identical. If there is a diff, it would be measured in nanoseconds,.. nothing we would ever notice.
If you research what is said by engineers, rather than folks like us blathering about on forums, you'll find statements like this from Jim Wurth from Sunoco Race Fuels. He explains, "A perfect example is Sunoco Maximal, which is our fastest burning fuel, and one of Sunoco's highest octane fuels at 116 (R+M)/2. A lot of Pro Stock teams rely on Maximal for those sub-seven second runs. When they are turning 9,000 rpm or more, the fuel has to burn pretty quickly to achieve complete combustion."
The old saw about premium burning slower is one of those "everyone knows" kinds of things, such as in the 1500s "everyone knows the earth is flat" or today, "Everyone knows whole grains are healthy."
That said,... it is mostly irrelevant.
In any event, here is what matters to us: -- 87 octane is marvy in a stock Savage running properly. -- using more than 87 in a stock Savage running properly is a waste of money. -- using more than 87 in a stock Savage running properly won't hurt the motorcycle any, just your wallet. -- using more than 87 in a stock Savage running properly will not cause any increase in performance or do anything better for the motor. If there is any change at all (unlikely), it will be a decrease in performance. -- if you increase the compression ratio or advance the timing or both, use the highest octane you can get.
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