Corrosion is like rust, it's a slow process, so the concern is longevity not sudden catastrophic failure.
There isn't any approval process for parts to be considered safe for E85 use. But there is a list of known compatible materials with Ethanol and Gasoline. Rubber, Mild steel, and certain plastics are
not compatible with Ethanol. Parts with these components exposed to fuel without a protective coating will fail earlier. They have to use something compatible or a sacrificial coating that is safe. For example with aluminum they use a layer of zinc. To make Stainless steel they dip it in acid. There are some plastics that are safe though, like proprietary Viton.
Let me know if I missed something.
Quote:
Originally Posted by johnpr
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Just so people don't get the wrong idea from this old thread. The AKI octane is about 95.6 for E50 and 95.8 for E85. It depends on what grade of Gasoline they use for blending too.
Investigation of Knock Limited Compression Ratio
of Ethanol Gasoline Blends. Scroll down to Table 2.
Actual engine performance is closer to C16 from what I understand.