Posted by don656 on October 19, 2011 at 07:06:22 from (75.179.143.177):
A couple of weeks ago, I got some recommendations on this site that I should use a minimum of 93 octane gas in my 656 farmall. I had been using mid grade (89 octane rating). My operator's manual says to use fuel with a minimum of 93 octane, research method.
I looked up some information on octane ratings and it said that the research method was approximately 8 to 10 points higher than the motor method. The ratings at the pump are an average of the R & M numbers.
So, if I assume that the R method is only 8 points higher than the M method, then to get an average value of 89 octane, the M number would be 85 and the R number would be 93.
Therefore, isn't the 89 average octane sufficient to use in my tractor? (since it means that the R number is at least 93)
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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