Re: 1936 Ford flathead - is a fuel additive required
Question, is a different octane rating method being used? There are different methods to calculate octane, does that account for the higher octane rating? In the US they are normally 87, 89 & 91 and a some locations 85. The method used is listed on the pump here, just above the octane number. In the case shown it is (R+M) / 2.
R is the Research Octane Number (RON) and M is the Motor Octane Number (MON). MON is lower than RON and the pump rating number is the two averaged.
Last edited by JSeery; 10-14-2019 at 07:46 AM.
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