66 383 4 bbl mopar was 10 to 1 and way back then you were if you were running sunoco you COULD get by with 230 a 66 Ford 390 4bbl was also 10 to 1 a 70-71 429 SCJ was 11 to 1 and also a 460 was 11 to 1 . Ford offered two versions of the 390 in two bbl one was a reg fuel and it required 95 and the prem. fuel one required 100+ Now i have been around lots of engines and some that you may or may not have ever been around and back in the days of lets go fast if i had a dollar for every hour i spent on dyno's testing engines and changes we made i could enjoy retirement . Now i may not have and engineering degree but i did work around them mostly with ford and when i switched brands also Chrysler . and on this issue on the 93 MINIUM fuel requirement on the newer I H tractors you would have to see for your self what is going on , first off they are not the old slow turn engine that was a large bore and long stroke they are small bore short stroke and they now DO NOT have forged pistons that can get ride of the heat fast enough Believe me i had to get the gas tested that caused the second melt down and your thinking is fouled on this . I do have a lab report on the gas and the chemist went into great lengths on this as to why the 87 burns so much hotter then the 93 of today . Up till the death of the performance car era i had some really fast rides and the best one was my built 61 ford rag top with a 390 tri power that i built when i was 17 back then it was a 11.56 in a 1/4 and that one you COULD get by if you were light on the pedal with Sunoco 250 If it was the weekend it was the last click on the pump past 260 BUT i was running 13.5 to 1 with 72 CC heads . Like i said we ran all the old semi gas tractors on 105 back then to keep them running cooler and not detonate . when the new gas tractors come under a load it is not like what a car goes thru when ya mash the gas with a car you start a load off and it lightens as you gain speed . When a tractor engine comes under a load it increases till you reach the end of the field or the pull is over . The 87 or reg. of today is made for emissions and it runs way hotter and burns fast . Cars are now computer controlled and at the first tiny little ping the timing is layed back the injectors are told how much to squirt . with and old tractor engine ya got a mech . advance dist. a up draft carb and that is it when the flash happens the heat is much higher . that heat can not get away fast enough and the top of the CAST pistons start to swell . when you put a mic to a piston when building a engine you will find out that on the top above the top ring that it is .019 to .020 smaller then the skirt and when fitting said piston to each hole here again no two pistons are the same out of the box. So you mic. each and size each hole for that one piston that is going into that hole Myself on a C263-291 i like .004 skirt to wall clearance So now with that and the .019to .020 at the top YOU should have about .024 clearance Should be more then enough , NOT with the 87 that top of the piston will expand over that and guild to the sleeve With the 93 that we get at the pump this does not happen as it burns cooler and slower and longer , now like Don 656 said he did not see any horse power increase NO you will not see a huge H/P increase BUT if you had that tractor on a dyno you WOULD see a little a horse or two and IF you had a pyrometer on it you would see a drop in EGT . NOW the next thing here as to Compression ratio on them , you also have to stop and think how many times that head has been off that tractor because of burnt exhaust valves because of not using low ash oil on this i am dead serious as here again i have learned first hand and after a lot of talking to OLD I H wrenches one guy from Marion Ind.showed me the TSB on the valve burning problem . But just how many times has the head on that tractor had .007-.020 shaved off it . Each time the compression ratio goes up . How many of them old dist. are wore out and giving just a few degrees more then they should ?? Can you run a dist strobe ?? and rebuild and test a dist?? I can and i have been doing it since 1964 when i bought a brand new 1020 Sun Scope and a 505 strobe and went to the Sun school to learn how to do this. Wright now i have two S/MTA's that will not run on the 87 because of the plain 450 Gas head and the above 8500 foot pistons and they are both running over 90 H/P . Put them on the New Holland 355 Grinder mixer and feed corn to them off the drag and watch them work . But they will not do it on the 87 or the 89 . I do a darn good job of maken the old gas tractors run and have been doing this for many years . My one friend a old fellow jocky of mine i did a 706 narrow ft fast hitch gasser for him and at the dead weight pulls it was never beaten and had two rooms full of first places to back that up . I would extend and invitation to you to come and see for your self and i can show the end results of the cheaper gas in these engines. Our tractors aren't pretty but they do run and run well and if it means spending the extra 20 cents a gallon then this is what we do . We use around 5-600 gallon of gas each year for what we have in gas tractors . And around 1-1200 gallon on the diesel . we will not get into the cost of the injection pump problems with the new diesel fuel.
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Today's Featured Article - Maintaining Rubber Tires - by Staff. The broad use of rubber tires on farm tractors and machinery has resulted in a great saving in both time and operating costs since the time of steel wheels. There are, however, certain basic fundamentals in the care of tires that should be followed carefully if the owner is to derive maximum benefit from his or her investment. First and most important is to maintain proper pressure for the work at hand. Your best guide to proper inflation is the operator's manual or instruction book tha
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