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juanvaldez · 09-24-2019, 05:33 PM

The octane rating system has changed since the old days. The new method R + M / 2 averages research and motor octane and give a lower number. I think modern 93 is really around 100 by the old method. Modern avgas, 100 LL is really around 93 octane by modern method. As for lead, 100 LL has about four times (2 grams/gallon) the lead as the old eythl and really fouls plugs.

09-24-2019, 05:33 PM	#14
juanvaldez Junior Member Join Date: Mar 2019 Location: Kingsville TX South Texas Posts: 21	Re: AvGas in the ford The octane rating system has changed since the old days. The new method R + M / 2 averages research and motor octane and give a lower number. I think modern 93 is really around 100 by the old method. Modern avgas, 100 LL is really around 93 octane by modern method. As for lead, 100 LL has about four times (2 grams/gallon) the lead as the old eythl and really fouls plugs.