Posted by The tractor vet on August 28, 2011 at 09:01:50 from (76.212.235.251):
In Reply to: Re: 806 gas burners posted by Larry B 1486 on August 27, 2011 at 21:10:58:
Reg. gas back in the that era was 95 octane and high test was 105 or better depending on who's you bought . Sunoco 240 was the lowest i could run in my built 390 and it was 105 . Usually ran 260 on the street and for the strip i went one notch above that . Back in 68 and 69 Ford offered two versions of the two BBl. 390's one was a reg . gas and one was a prem. gas . We had lots of problems with the premium version with customers thinking that they could just run reg. in them Gulf had the lowest grade gas called Gulf Tane and it was around 91 -92 octane and it would even make a 6 cylinder Chebby pick up ping and knock. Gas started going down hill around 74 as far as octane and the end of the gas tractors was close behind it . That is when we started seeing problems starting with gas tractors. and also no when you get and overhaul kit they are no longer FORGED PISTONS , they have gone to a CAST alu. piston and they can not get rid of the heat as fast as a Forged piston.and this is the main problem ,HEAT . Today you can not build a engine to go play with and run pump gas with much over a 9 to 1 compression ratio and that is a play engine. Not a working engine . Even my S/MTA does not like 87 octane . I got it out the other day first time in 11 years i have had time to set down and do anything with it and after going thru the carb and getting that old nasty gunk out i dumped in some 87 octane that was fresh in a can and she fired off ok and while i was adjusting the carb and getting it charging again when i went to shut her down she dieseled and little even with the idle set at 450 , why because the 87 burns somuch hotter , it is blended to burn hotter for emissions on CAR and light truck engines. The 93 is a cooler longer burn and it is as close as we can get to the old gas. Over here everybody i know has atleast one if not more gas tractors that get used in everyday farm operation . My buddy and i only have three diesel tractors and the rest are gassers. We have the 1066 and my 806 and his boy's 720 Deere . The 706 is gas the J/D A and a farmall h . Neighbor has two S/MTA's a WD 45 a Late model 8N a Farmall 400 and a Farmall M that do everything on a working 40 head dairy farm . My other close friend milks 45 cows and farms about 275 acres and has two diesels and everything else is GAS including the combine.We all have gone to getting the 93 octane and have no problems working these tractors where it was a constant fight . we just Read the owners manual and it states wright in there the Minimum octane and again i said Minimum octane requirement for that engine. Most of these tractors are one owner tractors bought new on the farm and have worked everyday since new . Other then two S/MTA's and the two 706's that my friend bought off me and they have had them almost twenty years .
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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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