Endurance Racing - What Octane?

[lokirx706]

As stated above low octane is all you will need. You will gain no power in running 91 in an 84 GSLSE. I doubt you will notice any difference at all really.

High octane (91/93 and above) is for knock resistance in high compression, or forced induction engines. It sure wont hurt to run it, but why bother? Save yourself some cash!

[Van330ci]

I have been told the engine will run cooler with 100 octave race gas, is this true or a mith?

[lokirx706]

Originally Posted by Van330ci

I have been told the engine will run cooler with 100 octave race gas, is this true or a mith?

I was told by a gentleman that builds aircooled Volkswagens that is does. However it isnt a very significant change, perhaps only a few degrees. They would do it if they were worried they might get stuck in traffic. I am not using this as factual information, simply stating something I was told by a 'mystic' VW owner...

I would assume this would be much less noticeable on a water cooled engines. And probably not even noticeable at all, at the compression ratios most N/A rotaries operate at.