Aviation fuel is not the perfect solution and is a bit risky. Some years back
Shell Oil's research department told me aviation fuel, in a high performance
street car or race car, has a tendency toward a high speed knock which you can
not hear ... and will destroy the pistons real fast. However aviation fuel
performs normally relatively to low speed knock, which is what one is accustomed
to hearing and judging fuel performance from.
MHKitchen@aol.com wrote:
> Since we're on the subject of gas.....
>
> I've had to use 110 octane leaded CAM2 or Sunoco race gas in the twin cam
> with its 13.5 :1 compression ratio. But it does get expensive!!
>
> I was convinced to try Aviation Gas this summer up in Seattle, which seemed
> to work fine...no detonation or performance issues. And it was 50% or less
> of the cost of race gas.
>
> Recently, I tried to buy more Av gas here in CA, but found a) that no one
> would sell it to me in a jug...would only dispense it into a plane, and b) I
> find that they now only sell "low lead" Av gas with an octane rating of 100.
>
> I've heard that the "low lead" Av gas @ 100 octane is REALLY equivalent to a
> higher octane automotive fuel, which I'd tend to believe since it worked so
> well.
>
> Does anyone out there have any definitive answers on using Av gas in race
> engines? I hear stories pro and con about it. I would tend to agree that Av
> gas comes under higher scrutiny and quality control than race gas..but is
> there a downside?
>
> Inquiring minds want to know???
>
> Myles H. Kitchen
> Air Cortina Pilot
> 1965 Lotus (about to rotate) Cortina Mk1 #128
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