It's the cylinder pressures and temperatures in the later HIGH compression IH gas engines. That is, any post-1958 tractor starting with the 460/560 series.
The old pre-1958 engines are LOW compression engines, and run fine on 87 octane. Higher octane is a waste of money on these.
Lean, rich doesn't make a lick of difference. The low-octane fuel will still go *BANG* too soon in the high compression engines. It's the fuel, not the mixture.
Octane doesn't make any difference in modern cars because there is a computer, a bunch of sensors, and a bunch of controls that change timing, fuel mixture, etc. to compensate. These old engines have one "sweet spot" where they work. Performance and longevity fall off drastically when you start messing with that sweet spot.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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