A given octane of fuel will produce the most power safely just short of
knocking. It may produce a bit more with light knocking but personally I
wouldn't go that far. Reduce the octane and knocking increases for a given
rpm, throttle opening and load which is why timing has to be retarded for
lower octane fuel. That reduces performance and increases running
temperatures.
When manufacturers advised a certain timing setting not only did it take
that into account, but it also took account of the tolerances of various
components that will result in knocking under the same conditions for
different engines, but it also included a safety factor. That is why some
engines can safely be run with more advance than recommended, giving better
performance and economy, and some can't. Over the years I've experienced
both.
PaulH.
----- Original Message -----
> Thinking about it now, it seems that the more power under light knock
> might be due to either: more advanced timing (producing knock), or
> higher energy (lower octane) fuel.
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