Posted by The tractor vet on May 10, 2011 at 18:59:42 from (76.212.227.102):
In Reply to: Re: 706 engines posted by ih706user on May 10, 2011 at 11:23:30:
Well if you were running them BACK IN THE DAY and even up till about 1980 you had gas that would run fine, Because the gas was 93 octane. GOD I GET TIRED OF THIS . JUST READ THE OWNERS MANUAL ON THE TRACTOR. And you do not have to having the timing jacked up to have a melt down . 87 burns fast and hot 93 is a slower longer burn and burns cooler . They stopped building gas tractors in the seventy's , they were changing the gas by 75 to the unleaded , but you could still get the leaded and the first unleaded was in the 90 something range . We run a lot of gas tractors over here still and the problems really did not start till the eighty's as the gas got junkier . First showed up on a 460 gasser that hauled manure twice a day everyday . It would start wright up take the load out of the barn and across the road and DOWN the hill just like the day it was new on that farm BUT get down to the far end and try to come up the hill and she would start to miss knock and die and would not restart till it cooled for 10 15 min. and it would make maybe 100 -0200 feet and start doing it again . . drove me nuts with the problem , then the neighbors 766 gasser started doing it on spring plowing , but my 706 was running strong no problems . Both my 706 and Ronnie's 766 had the C291 Both tractors rebuilt with the same parts both tractors set the same timing on both set the same Both tractors running 18.4 34 stones both tractors pulling the same plows at the same depth both tractors in the same field , the difference was mine was running hightest and he was running the cheap stuff . We got to put a new set of pistons in Ronnie's lucked out and was able to clean up the sleeves with the hone put the good stuff in his and problem solved . Did the same on the 460 and uped grade of gas i it and it has now gone back to doing everything that it did when new. Setting here next to me is a brand new piston that has about 32-33 hours on it that came out of a 706 that got the 87 octane gas that i would love to show you the end results . And if i could find the other one that got ate with 87 because the fuel guy brought the wrong gas to the farm by mistake . you guys got to keep in mind here that yea it is just a tractor they were still modern high speed high performance engine they are not and old M that is slow turning long stroke they are high compression . And like i said read the book on what fuel is to be run it says MINIMUM octane of 93 that is MINIMUM not max . Guy's Regular gas at the pumps back then was 95 93 was the cheap stuff that would make a old and i said OLD Cheve 6 cyl. ping and knock. The avg. car had a 9.5 to 1 comp ratio and the avg. fun car with the 4bbl. carb and dual exhaust and 4 gear was 10-11 to 1 and ran on 105 or better at the pump. My 61 Ford rag top with a built 390 tri power would only run on Sunoco 260 or the next click up or Amaco high test . Guys i know what i am talking about here i am 65 i have been working on engines since i was a teenage back then if it would not run atleast a 13 second 1/4 mile or put the speedometer out of sight in third gear it belonged to and old man . I can make and engine run and squeak out every pony that and engine is able to do from mild to wild . when ya have and old I H gasser running to her max it will amaze ya. I just wished that i could have some of ya come run Eugene's 706 just for a hour . Now granted we did a little extra on his but oh my . When we rebuilt it we took the time and had it balanced fit each piston to the hole that it was going in all the pistons were matched for weight cam rebuilt and reground no stone was left unturned she was built like you would do a race engine reworked the gov. and talk about snappy . If any of ya have or on Skypes you can get a hold of me on there and i could show ya that piston Just look up tractor_vet.
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