Re: what octane gas to run?

Posted by the tractor vet on October 29, 2007 at 20:14:10 from (75.19.120.169):

In Reply to: Re: what octane gas to run? posted by LenND on October 29, 2007 at 18:21:17:

This may be true , but after the war that is when the trend to MORE power started . All them old distallat tractors got rebuilt with higher domed pistons and the old Cast iron pistons got throwen out in the scrap for the aluim. forged pistons with the step head desigen or the flat heads then along comes companys like M&W maken more PERFORMACE tractor parts . So guys could plow in third gear rather then second . and the auto ind. started maken bigger cars that went faster with bigger engines . Trucks got bigger and faster and the fuel comp. had to stay in pace with the engines . Before i went to the service i was playen with hot cars and fast wimmen and i worked construction . A times i would have to drive the one lowboy outfit that we had that was a 57 B60 Mack pullen a fifty ton lowboy BIG old 6 cylinder GAS with a huge 4bbl carb 5 speed with a 4 speed . ANd that old girl lived on 105 octane GAS like all the old gas powerd truck of the day . The owner of the company kept no gas at the shop because of some people would believe it or not steal it back then. Well when it came time to Feed the Mack i would run up the road about ahalf mile to the little fuel stop that was on old US 224 a major truck route and Feed the old DOG with 105 octane gas she held 250 gallons of the stuff and back then we got a three cent discount and it cost 15.9 cents a gallon . Well the boss told me that i could buy gas for my car out there under the company name as long as i paid cash . Well that is where i fed my 56 ford and my 61 ford . I learned a bunch about fuels over the years of building race engines and worken in car dealer ships after i came back from the service . I worked on The hot Mo pars for a couple years then went to take over a dealerships racing program with fords. Learned more worked with the factory engineers with new parts that they were bring out for the over the counter sales to the young set . Did alot of work with customers that had driveabilty problems and here i learned more about the gas that was out there and who's gas did what to engines . Learned real fast that SOHIO's Boron with valve cleaner was just that , it would eat valves out of fords. The dealership had one customer that had bough a bunch of ford stright trucks with the 391's 477's and the big 534's he put dump bed on them and it was not long before they were coming in with valves out of them . Somehow i end up getting involved with his problem even though trucks were not part of drag racing . Three of us along with a couple of factoy reps , the guys that would come to the dealership remove his sports jacket and roll up his nice white shirt sleeves dawn a shop coat and dig in the dirt and grim with ya and work together to solve the problem . Now i am tellen ya ya ain't never lived till ya pull the head off a F950 that has a 534 . Today i could not even lift one end of the head but one guy hangen over the fender and up and out. That problem was the SOHIO Boron that the guy was using changed gas uped the octane rating and no more problems . The late 50 thru the mid 70's is whenmost of the big gas farm tractors were in use and believe me they were built to runthe REg gas of the day back then and back then 95 octane was the rating of REG LEADED GAS for the most part . Now some of the flyby night elcheep o station had gas that was down in the 90-93 rating and the engines of the day would let you know real fast . Same goes for the late 4and 6 cylinder I H gasser . First off they are HIGH rpm engines with smaller bores and shorter strokes . Less time to get rid of the combustion heat . Gas tractors run hotter then a diesel . If ya ever plowed at night with a good running gas tractor the exhaust manifold is almost cherry red all the way up . A diesel unless ya turn the wick way up they do not get that hot . Then came the Emission 's and the compression ratio started to fall off cam timing got set back ing. timing went everywhere and performance and fuel mileage went into the dumpster and here we are today driven gutless wonders that just suck gas and go noplace . and fuel has changed to meet emission . And the reg. of today burns real hot alot hotter then of days gone by and the octane has gone down . And tryen to run and WORK a gas tractor of today that was made to run on the gas of yesterday or just try and run a old lets say 428 SCJ mustang set up the way it came out in lets say 1969 at factory spec's and not tweeked up to run . Oh it will fire up and maybe drive down the road BUT what will happen if ya stand on it with the reg. gas of today or even for that matter the So called Hightest of today . As it was made to run 100 + and the MAW AND PA drive to the store would just run on the 93 of today butya would have to trim back the timing about five degrees and when ya lay timing back they start to get hot . just like if ya go to far the other way.

Replies:

• Re: what octane gas to run? LenND 20:49:26 10/29/07 (0)

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