Quote:
Originally Posted by mrtexas
Higher octane fuel has more resistance to pre-ignition, it is more resistant to ignite due to compression. In a gasoline engine you want the fuel ignition to be by the spark plugs.
It doesn't have any more energy or higher performance. In a flathead it is a waste of money.
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That is what the slow burn of higher octane does is slow down the ignition rate to burn slower. Exactly, a waste in any flathead unless running extreme compression or forced induction. Even then it depends on the timing and static compression ratio.