The damage that these engines sustain from low octane gas has little to do with preigniton but from heat. Low octane gasoline burns fast and hot heating up the cast aluminum pistons causing them to expand and score themselves and sleeves. I have had personal experience with this on my 706 with 900 hours on a dealer overhaul. It had been used for lite work until I decided to grind feed with it one day with regular gas. She shut herself down after 10 minutes of grinding. When it cooled and I restarted it it had a very noticeable piston slap. Pulled it apart and no 6 was badly scored and the other cylinders were scored too but not near as bad. Back in the day these engines were manufactured with forged pistons. They responded much better to the heat. For whatever reason forged replacement pistons were discontinued and cheap cast pistons replaced them. Cast can live with high octane fuel but not so tolerant of low octane fuel. But to each there own run what you want its not my checkbook.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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