Because , first off it is a high compression engine and needs it . If ya run plain old 87 it burns in a flash burn and hotter and will super heat the piston and cause it to swell more then the clearance between the wall of the sleeve and the top of the piston has and this will cause a seizure of the piston and sleeve . Also ya can not bump the timing up on these engines even on the 93 octain . Like i have said over and over again the gas of today is not the gas of the day where these tractors were built . The gas of today burns alot hotter for emissions reduction . THen ya take into account that the pistons ya buy today are not forged pistons but cheep cast pistons and can not transfer heat to the skirts and to the walls like a forged piston can . Now if all ya do is just drive it around the yard and never work it it may last on 87 but you put it to work and you will eat a couple pistons or at least score the cylinder walls . How do i know all this well it was lest just say a couple COSTLY LESIONS and a trip to a independent chemist and big money spent . Back when the new line of 4-6 cylinder gassers came out Reg. pump gas was 95 octain for reg and the cheep junk gas that even and old 6 cylinder Chebby would not run on was 92-93 . When we would do one of our upgrades on a S/M - S/MTA's ya had to move up to the 93 . While i was farmen back in the 80's everything i had was a gasser and my old wore out 706 that was so bad that nobody would buy ran supe good on the hightest but tryen to be cheep on the Massey 300 combine with the 225 slant 6 would run real hot on 87 but it ran , another pice that i could not get sold . I farmed with junk well that is what everybody thought but i was farmen and the funny thing is that i got the same price for the crop as everybody else did . . The massey is the one that had me stumped till one day . I was headed to a sale out in Ind. and when i stopped for gas in the truck the price was 40 cents less out there then at home and it was time to start shellen corn and i was going to need around 200 gallon of gas to feed the massey with all the custom work and my owen shellen , hey thats 80 bucks that can stay in my pocket . They always had fuel tanks at the sale some with pumps and some with out also in Ind. they had FARM GAS back then it still had lead in it and was around 92 octain . So why not buy a couple fuel tanks and fill them with farm gas for less money then i would have to pay around here . So i did i bought three pick up style 110 gallon tanks one with a pump and two with out . on the way home i stopped at Mount Comfort and filled all of them . That weekend i put the old massey to work on 76 acres of custom work and that is when i discovered that OH wait a min she is running a whole bunch cooler and she has never ran this cool like about 40 degrees cooler ya cold feel the difference since ya sat next to the engine . Now why is it running cooler i have done nothing But put the gas in it . Then later on after working on several 6 cylinder gasser around here for scored sleeves and one engine failure and studing what happened there it all came down to the gas that is when we took the gas to the Lab for testing and also at the same time i got my hands on a operating manual as to the for a 706 gasser and sat down and read it , and in the FUEL req. it tells ya in black and white that the MIN. is 93 octain . Also the ing. timing is of the most importance on these engines and must be set dead on the money OR ya will have a melt down. . You will never hear the pinging till it is to late and if she pulls down and quiets she is done for , oh she will restart in 15 -20 min . but the damage is done and will need to be rebuilt .. Now ya stop and thing about all this and just how many times has this engine been rebuilt and how many times has this head been milled down and everytime ya peal 7-10 thousants off the comp ratio goes even higher and adds to the problem.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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