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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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