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Re: Re: Re: Re: Lead additive
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Posted by Bill Jones on December 16, 2001 at 22:18:29 from (63.17.133.221):
In Reply to: Re: Re: Re: Lead additive posted by Bob Kerr on December 16, 2001 at 07:55:54:
Bob,The white gas probably contained alcohol,so its octane was higher than the gasoline of that period.Ethyl alcohol has a long history of use,not just as a fuel addative,but also as pure fuel.The first prototype internal combustion engine in 1826 used alcohol and turpentine.Prior to the Civil War alcohol was the most widely used illuminating fuel in the country,Alcohol powered the first engine by the inventor Nicholas August Otto,father of the four-stroke IC engines powering our tractors (and cars!) today.By the time of Ketterings anti-knock search,ethyl alcohol was a proven auto fuel.By 1917,Kettering and his staff trained their octane boosting sights on ethyl alcohol,(grain alcohol, the kind you drink(ya know,Moonshine!),also called Power alcohol,or Ethanol.In tests supervised by Kettering and Co.for the Army Air Corps at Wright Field in Dayton, researchers concluded that alcohols were among the best antiknock fuels,but were not ideal for aircraft engines unless used as an additive,in a blend with gasoline.These tests were continued at Pikes Peak with, among others, the Liberty 12-B,12 cylinder Turbosupercharged engine.Supercharging systems used in reciprocating engine induction systems are normally classified as either Internally driven or Externally driven(TURBOSUPERCHARGERS).Internally driven superchargers compress the fuel/air mixture after it leaves the carburetor,while Externally driven superchargers(Turbosuperchargers)compress the air before it is mixed with the metered fuel from the carburetor.I hope this clears up the confusion about the "Turbosupercharger" mentioned on that plaque. I once worked on a Corsair(F4U-7) and it had a thirst for 115/130 avgas.This fuel is dyed Purple and is VERY expensive as it is made just for Warbirds.The discussion of lead added to fuel made me think of that purple gas,because for that Bird, high horsepower meant high lead for antiknock prevention.Well I did it again,I talk way too much...gotta get a hobby I guess:^) BillJ
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