![]() probably auto racing too, but the Schneider Cup series was for sure a testing ground (seaplane racing. I think aircraft racing in the late 20's, early 30's was where a lot of that idea was tested. the effect on engine design and available power was profound. of course you can't have 140% of something in a ratio so it became a performance number based on an extrapolation. fuels were made that had detonation resistance as much as 140% over what pure octane could provide. they soon discovered that adding stuff to the fuel let the actual percentage of the expensive & desirable octane molecule be reduced and yet still maintain the same performance. 80 octane fuel was 80% octane and 20% heptane. so in a nutshell, the early benchmark was that ratio. in the early days when detonation was not fully understood they started doing tests & found that the ratio of octane to heptane was a major factor.
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