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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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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