With all the talk and disagreement about octane ratings and their use, has any one ever put a detonation sensor on one of these engines to help determine if we are having detonation or not. I certainly cannot hear any but my ears don't hear any high frequency at all . Others hear the old auto engines ping and I don't. Just seems to me we could tune that engine under full load for the fuel we are using by varying the total spark advance with in limits of course. It doesn't take very much increase in compression ratios and design of combustion chamber to alter the needed advance. I see guys running 40 degree advance on a M farmall with gasoline head and fire crater pistons. It was supposed to be 22 degrees with 93 octane fuel. I hear of guys pulling their engines that are rated at 1800 rpm down to 1200 rpm which has to drive that combustion chamber up the wall unless he had tuned his distributor for proper advance at that speed.
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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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