Ah no the highest compression ratio that that you should run on 93 is 9 to 1 and limit your total advance timing . You want to run a 10to 1 then ya had best be looking at 105 or better . Gas of today is NOT the gas of yesterday . Most of you just can't get it with this gas thing . so lets go back to prehistoric day of old . Back in 1963 i became a truck driver as part of my job and i started driving a 1957 B model Mack that was GAS powered as many of the trucks of the day were gas powered . This Mack only pulled a Rodgers 50 ton lowboy and only hauled the light stuff under 100000 lbs , all the old truck stops had the gas and diesel of the day and the gas at the truck pumps was 105 octane , The pumps for the cars ya had three grades ya had the really cheap stuff that could be 91-93 the regular at 95 and the stuff ya ran in your four BBl.high compression lets go fast ride and it was 105 OR BETTER . You look back at the ORG owners manual for the new tractors of the day and the octane rating needed for that tractor was already going up in 1957-8 with the onset of the 460-560 that minimum for them was 89 , then the next big jump came with the 706-806 and that one carried on thru till they stopped making the gas tractors around 1975 . and those needed 93 or better as they were considered HIGH COMPRESSION HIGH RPM Industrial engines of the day. Ford back in 1968-71 offered and engine in there full sized galexys in 390 Cu. in that you could order in in three ways , one was a 390 reg . fuel two bbl. engine that sported a 9to 1 a 2 Bbl.premium in 9.5 to 1 and the Four Bbl. in a 10 to one and 320 Hp. . Then in the Toreneno (sp) line you could get the 390 Hp in a 10'5 to 1 at 325 . . The problems we had back then as i was now working as a mechanic for a large ford dealership and running the drag car program and was the Drag club performance adviser we started getting LOTS of complaints of engine knock on the 390 2 Bbl. from people as they were running reg gas in the premium fuel 2Bbl. engines and depending on who's gas they were burning depened on the level of engine knock . We had a hard time tryen to get people to put the correct gas in them and all ya had to do was open the hood and on top of the air cleaner it told you what 390 you had as if you had a reg fuel 390 it said so as in 390 @ Bbl. regular fuel or 390 2Bbl, Premium fuel or 390 4Bbl, premium fuel . Same as the semi gas burners they ran the high test . We could still get good gas into the mid 80's and it started going down hill and the problems with gas tractors and gas powered trucks started , started seeing a lot of carb issues with the Holley's , started seeing a working gas tractor start tryen to die loose power and just seeze up and let cool down restart and sometimes they ran fine till ya worked them hard again and they would do it again , sometimes after they did this they started to have a mid range knock and started usen oil as now the on farm gas was no longer 93- to 95 octane but now we are down to 89 and sinking fast . Myself i could no longer build my barn yard pick up engines and use the good stuff from 1970 as we no longer had the gas to support that engine . Our 93 straight gas went Bye Bye four years ago and with it went the 706 gassers as the two we still had working both ate pistons on the fresh load of gas , and both tractors were just mowing hay .
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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