You're correct about 93 octane being sometimes hard to find. I carry
a few cans of octane booster... just in case. But it hasn't been a
problem yet.
-Shannon
>
> Assuming that by 91+ you mean 91+ RON + MON / 2 (what pumps are supposed
> to display in the US), then I would have to say that you need 93 octane
> fuel and you'd have to retard the ignition. 94 octane Sunoco (or other
> brand) might work...
>
> I would not run an iron motor over 10:1 without knowing the exact fuel
> octane and whether the motor will knock under load.
>
> Call me cheap, but I don't like holes in the pistons and broken rings...
> and that's what happens if your motor experiences detonation.
>
> A lot of folks with high compression motors run av-gas or racing fuel to
> insure that there is no detonation.
>
> From asking around other TR6 owners with "pumped up motors", I'd have to
> say that going much above 9.5:1 is iffy if you drive because it's not
> unusual to pull up to a gas pump in Backwater, USA only to discover that
> your only choice is regular 87 fuel. Been there, done that. With 9.5:1,
> you have a prayer (that the merchant has some octane booster on the
> shelf). With a higher C/R, you're asking for trouble.
>
> On my 9.5:1 car, I've tried a tank of 89 octane pump fuel and experienced
> "run-on" when the motor is hot. When I use the 93 octane pump fuel, I
> don't get any run-on. I wouldn't think of putting 87 octane in there.
>
> > Michael K CD255L, etc....
>
> regards,
> rml
> CF14111U and CR1871UO
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