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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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