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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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