Posted by MarkB_MI on February 11, 2014 at 02:45:55 from (75.198.62.60):
In Reply to: Aviation Gas posted by Patrick Klise on February 10, 2014 at 18:44:30:
The reason for using avgas has nothing to do with lead content or high octane. Modern small engines need neither. The main advantage of avgas is its long-term stability. Avgas has a maximum Reid Vapor Pressure of 7 psi, primarily to prevent vapor lock. Historically, mogas had a much higher vapor pressure, but typical summer grade gasoline sold today has a relatively low RVP. In some areas, summer grade gas is limited to 7 psi RVP, same as avgas. In California, RVP is limited to 7 psi year-round.
A lot of companies are working on replacements for Avgas, but the real problem isn't replacing the lead so much as is the small market for aviation gasoline. There's not a big incentive for companies to come up with a replacement for a product that's not a major part of their bottom lines.
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