If I farmed and if I had a 460 or 560 under heavy load all the time, I might think about higher octane, but I would probably have to ruin an engine with only one or two thousand hours on it to convince me. My 460 operators manual says 87 octane by the research method. If you take 87 by the research method, add it to whatever it is by the motor method (lower), then divide it by 2, it would be lower than the 87 octane that we are currently using, meaning the 87 octane in an unmodified engine with a 7.2:1 compression ratio should be ok. The gas in the 50's was less than desireable, IMO, the current gas is better than the 50's, likely because of more additives and stricter rules in the refining process. My dad's H under very heavy load in the 50's which required shifting down a gear, would ping under certain conditions, I did not run it that way. We had one batch of gas that we could light like kerosene, in other words hold a match next to it and it would slowly begin to burn (I'm not the one that tried that). Judgement according to the conditions that you are using the tractor plays a big role. You put too much load on a tractor, abuse it for not too long a period of time, and it is going to need an early overhaul. You are free to continually state your opinion, as we all are, you will simply not convince everyone, the same as I'm not going to convince you. Don't take it personally.
This post was edited by CNKS at 19:19:03 07/18/10.
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