My IH engine service manual, ISS-1040-1, last printed in 1968 says that the gas C221 and C263's have a compression ratio of 7.2:1, LP is not mentioned. The C291, also used in the 706 is not mentioned either, but the C301 which is sleeveless has a compression ration of 7.7:1. I don't know if the compression ratios for post 1968 engines were increased or not. The 460 is the largest tractor I have, the operators manual says to use 87 octane by the research method or 80 by the motor method. (R+M)/2 would be 83.5 octane. Not sure that that low octane is sold even at 5000 ft elevation or so, where the octane requirement is less.
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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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