interesting debate guys. Cheers

Daim help me...what do you mean by CATS no Cats??

 

Cat = abrieviation of catalytic convertor

 

Oh cheers Daim

 

My Car sat with half a tank of Petrol which had not been started for 10 Years!

Put on a battery turned the key and she started and ran like a bird with no problems at all.

Having used up all the old petrol, I then filled her up with 99 octain and have so far not encountered any problems.

 

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

 

There's no credible evidence that high octane fuel degrades at a different rate than lower octane. Presuming that higher octane fuels have a greater proportion of lighter distillates is also incorrect. There's a greater variation in this regard between winter an summer fuels, not octane levels. This is measured typically by RVP (Reid Vapour prissure)


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.