Does 98 Octane go bad? Leaving fuel in your tank when not driving for a month
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paulyling (12-14-2014)
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Interesting.
My first car was a 23 T roadster pickup. At the time, gas was regular, or low lead and premium, more lead. No ethanol at the time. but, I think the idea was that T's would run on kerosene after starting and warming up on gas.
Modern fuels do degrade with time. But, do the higher octane fuels degrade faster than the lowers. Just maybe. Higher ones taken off "higher" in the cracking process and as such a lighter fuel. The lights evaporate faster than the heavier? Or is it that the additives make for octane differences and they might degrade with time.
The Ethanol does do weird things with pot metals found in some carb.
My T's fuel system had no rubber. All hard lie, event the float.
Later domestics had flex hoses somewhere. Rubber in those, likely. and they do fail. any more so with E fuels, I dunno.
Somewhere in my oddities, I have a box of these old hoses. NOS!!!
Now, why more Octane than needed??? Wow, the lower octane fuels have more BTU'S!!!! But, caveat too low and preignition can set in with bad results.
My two cars as well as my lawn mower are happy on 87!!
But, when I redid my Toyota FJ40 a combination of pistons and heads gave it a lot more squeeze. Decidedly unhappy on 87. Up the scale, ran great.
It left here for life with a high school quarter back and crew. I wonder how long that lasted!!!
Carl
My first car was a 23 T roadster pickup. At the time, gas was regular, or low lead and premium, more lead. No ethanol at the time. but, I think the idea was that T's would run on kerosene after starting and warming up on gas.
Modern fuels do degrade with time. But, do the higher octane fuels degrade faster than the lowers. Just maybe. Higher ones taken off "higher" in the cracking process and as such a lighter fuel. The lights evaporate faster than the heavier? Or is it that the additives make for octane differences and they might degrade with time.
The Ethanol does do weird things with pot metals found in some carb.
My T's fuel system had no rubber. All hard lie, event the float.
Later domestics had flex hoses somewhere. Rubber in those, likely. and they do fail. any more so with E fuels, I dunno.
Somewhere in my oddities, I have a box of these old hoses. NOS!!!
Now, why more Octane than needed??? Wow, the lower octane fuels have more BTU'S!!!! But, caveat too low and preignition can set in with bad results.
My two cars as well as my lawn mower are happy on 87!!
But, when I redid my Toyota FJ40 a combination of pistons and heads gave it a lot more squeeze. Decidedly unhappy on 87. Up the scale, ran great.
It left here for life with a high school quarter back and crew. I wonder how long that lasted!!!
Carl
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Location: Perth Ontario Canada
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Modern fuels do degrade with time. But, do the higher octane fuels degrade faster than the lowers. Just maybe. Higher ones taken off "higher" in the cracking process and as such a lighter fuel. The lights evaporate faster than the heavier? Or is it that the additives make for octane differences and they might degrade with time.
You mean 'detonation' not 'pre-ignition'. The variation in BTU content between low and high octane fuelis insignificant. One is not inherently higher than the other.
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paulyling (12-15-2014)
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