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Originally Posted by mazdatech177
if im not mistaken, higher octane fuel has a lower btu count. octane is resistance to burn. the reason you can run higher boost or cylinder pressures with the higher octane fuel is that it ignites at higher temperatures than lower octane fuel. that way just the increased heat from the compression of the air fuel mixture wont ignite it
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LOL NO I think you are way off on that one, the octaine has nothing to do with BTU rating. Octaine is just a mesurment of a type of molicule in the gas, that takes a little longer to burn because it is such a long chain of hydrocarbons. Higher octaine just menas that you can put it under more pressure before it knocks. I think Nitro Methane has a higher BTU rating than gas and it is supposed to be VERY slow burning, hence they can cram 31psi into a top fuel dragster through a roots supercharger! Gas would already be darn near ignition at that point before the pistion started compressing it. Do you know how hot the air coming out the other end of that supercharger is??? It takes 700hp just to turn it! A roots supercharger is prob heating that air to 500+ degrees at 31psi with no intercooler! No gasoline on earth could take that to my knowlage.