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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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