For what it's worth: - preignition, piston clatter (slap), and pinging are three different things - pinging is detonation - a fuel's octane rating is not a measure of its energy content nor of how fast it can be made to burn. Octane rating is a measure of a fuel's resistance to detonation. Typically (and counterintuitively) a higher octane fuel is slower burning - burn rate is not a constant, among other things it depends on pressure and temperature, both of which change as a piston moves and also as a function of how much burning has already happened
-- - Daniel Fredericton, NB Canada
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