The compression ratio of my 460 is 7.2:1. Operators manual says to use a minumum of 87 octane, research method, or approximately 80 octane motor method. Using the current rating of R+M/2 makes the recommended octane rating 83.5. Regular unleaded in my area is 87. Been my opinion ever since leaded was phased out in the early 70's that a little less than 9.0:1, maybe 8.5 or so meant higher octane. Being conservative I would think that my tractor would do fine on 87, if the compression ratio exceeded 8 then maybe higher octane should be considered, particularly if carbon buildup is a problem. This octane thing will probably be argued forever.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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