You probably ought to run Av gas just to be safe. Those high compression tractor engines...probably 8:1 and running outrageous RPM"s...in the three thousands can"t be abused with regular pump gas.....likely will self destruct.
Now, I don"t have a book or manual or calling from a Higher Power to hand down advice. But, unless you"re pulling the guts out of that 706, I doubt you"ll notice the difference between 87 and 93 octane gas. Ten to twenty cents a gallon isn"t all that much if fuel cost is all you that are considering.
8:1 compression is not high and three and four thousand rpms isn"t high either.......higher than what old tractors operated at....but still not high rpm"s.
High compression starts at around 9.5:1 and high rpm"s come in at 6,000 or better......neither of which you will find in working tractors of any vintage.
I wouldn"t buy 87 octane gas just to save 20 cents a gallon......but to use 93 octane gas because I thought it would destroy a 6 cylinder tractor engine due to high compression and rpm"s.....I think not.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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