Thread: speaking of correct octane fuel????????

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Scooter, it's pretty much impossible to say because the fuel required is not dependent on static compression ratio, it's dependent on dynamic compression ratio and you don't know what that is until you run all your data through a DCR calculator.

Even after you've determined DCR, there is so much conflicting information out there about what works with what and what doesn't that it will just confuse you.

I suspect that the only bulletproof way to tell would be to bolt up a rattle detector on the side of the block and try decreasing grades of fuel until the motor detonated.

I can't remember who it was now, but someone on here was saying that he ran a PSI of 200+ on pump gas with everything polished internally to prevent hot spots, no PCV or EGR to pollute the mixture and a very tight squish.

In your case, is there that much difference in the cost of fuels that would cause you to investigate the limit of the fuels?