A little “Tip” I picked up from another web site that might be of interest to some of the club members.
Some think octane is a chemical additive in gasoline. Octane is a number that
standardizes the performance of gasoline. The higher the octane number the slower the fuel burns. If fuel burns too quickly, it reaches super sonic speed. The pinging you hear is the burning fuel breaking the sound
barrier. The crack of a bull whip is the same thing, as it exceeds the speed of sound.
In WWl it was discovered that tetraethyl Lead was a big enhancer of the performance of gasoline. Back in the day (1946), filling stations offered two grades of gas, 79 octane regular, and 85 octane ethyl. Detroit was
getting with the program around 1954 as far as raising compression ratios, many having 10 to 1. The gas octane was raised to meet the need, to 86 octane regular, and high test or ethyl, 94 octane.
A company called SUNOCO, in 1956, had a 'dial a grade' pump at all of their filling stations. You were able to purchase gas with over 100 octane. They started with 5 different blends, then later changed to 8 different
blends, increasing octane respectively.
In 1958, to be competitive, all filling stations were offering at the pump three grades, 90, 98, 100. About this time, nickel was being used as well to enhance fuel performance.